Population Structure and Growth of Walleye in Gregoire, Ethel, and Hilda Lakes, Alberta, 2007

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CONSERVATION REPORT

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Population Structure and Growth of Walleye in Gregoire, Ethel, and Hilda Lakes, Alberta, 2007

Brendan Ganton Alberta Conservation Association #101, 9 Chippewa Rd Sherwood Park, Alberta, Canada T8A 6J7

Report Editors PETER AKU KELLEY KISSNER Alberta Conservation Association 50 Tuscany Meadows Cres NW #101, 9 Chippewa Rd Calgary, AB T3L 2T9 Sherwood Park, AB T8A 6J7

Conservation Report Series Type Data

ISBN printed: 978‐0‐7785‐7727‐0 ISBN online: 978‐0‐7785‐7728‐7 Publication No.: T/197

Disclaimer: This document is an independent report prepared by the Alberta Conservation Association. The authors are solely responsible for the interpretations of data and statements made within this report.

Reproduction and Availability: This report and its contents may be reproduced in whole, or in part, provided that this title page is included with such reproduction and/or appropriate acknowledgements are provided to the authors and sponsors of this project.

Suggested Citation: Ganton, B.P. 2008. Population structure and growth of walleye in Gregoire, Ethel, and Hilda lakes, Alberta, 2007. Data report, D‐2008‐006, produced by the Alberta Conservation Association, Sherwood Park, Alberta, Canada. 19 pp + App.

Cover photo credit: David Fairless

Digital copies of conservation reports can be obtained from: Alberta Conservation Association #101, 9 Chippewa Rd Sherwood Park, AB T8A 6J7 Toll Free: 1‐877‐969‐9091 Tel: (780) 410‐1999 Fax: (780) 464‐0990 Email: info@ab‐conservation.com Website: www.ab‐conservation.com

i EXECUTIVE SUMMARY

High angling pressure, coupled with slow‐growing and late‐maturing fish, have put Alberta’s walleye population under stress. By 1990, many walleye populations in Alberta had declined to a small fraction of their former abundance. To forestall extirpation of these populations and collapse of associated recreational fisheries, Alberta Sustainable Resources Development introduced the Alberta Walleye Management and Recovery Plan (WMRP) in 1995. As part of the WMRP, I conducted gill netting surveys at Gregoire, Ethel, and Hilda lakes during the fall of 2007 to obtain information on the abundance and population structure of walleye in these lakes.

Data from Gregoire Lake suggested that in 2007 the walleye population had a broad age‐class distribution that was moderately unstable. The average walleye reached 500 mm FL at age‐14. Male walleye reached maturity at age‐4, whereas female walleye reached maturity at age‐6. The catch rate of walleye was 11.8 walleye/100 m2 /24 h.

Data from Ethel Lake suggested that in 2007 the walleye population had a broad age‐ class distribution that was moderately unstable. The average walleye reached 500 mm FL at age‐13. Male walleye reached maturity at age‐4, whereas female walleye reached maturity at age‐7. The catch rate of walleye was 14.6 walleye/100 m2 /24 h.

Data from Hilda Lake suggested that in 2007 the walleye population had a narrow and unstable age‐class distribution. The average walleye reached 500 mm FL at age‐13. Male and female walleye both reached maturity at age‐5. The catch rate of walleye was 15.1 walleye/100 m2 /24 h.

ii ACKNOWLEDGEMENTS

Financial support for this study was provided by the Alberta Conservation Association. Alberta Sustainable Resources Development provided in‐kind support, campground and sampling facilities.

iii TABLE OF CONTENTS

EXECUTIVE SUMMARY...... ii ACKNOWLEDGEMENTS...... iii TABLE OF CONTENTS ...... iv LIST OF FIGURES...... v LIST OF APPENDICES ...... vi 1.0 INTRODUCTION ...... 1 2.0 STUDY AREAS...... 1 2.1 Gregoire Lake...... 1 2.2 Ethel Lake ...... 2 2.3 Hilda Lake ...... 2 3.0 MATERIALS AND METHODS ...... 6 3.1 Sampling design ...... 6 3.2 Biological data...... 7 3.3 Data analysis ...... 7 4.0 RESULTS ...... 9 4.1 Capture data...... 9 4.2 Walleye population structure ...... 9 4.3 Stock assessment summaries ...... 17 5.0 LITERATURE CITED ...... 18 6.0 APPENDICES...... 20

iv LIST OF FIGURES

Figure 1. Map of Gregoire Lake, Alberta showing sampling sites ...... 3 Figure 2. Map of Ethel Lake, Alberta showing sampling sites...... 4 Figure 3. Map of Hilda Lake, Alberta showing sampling sites...... 5 Figure 4. Age‐class distribution of walleye from Gregoire Lake, Alberta, 2007 ...... 10 Figure 5. Length‐at‐age relationship for walleye from Gregoire Lake, Alberta, 2007.11 Figure 6. Age‐at‐maturity of male walleye from Gregoire Lake, Alberta, 2007...... 11 Figure 7. Age‐at‐maturity of female walleye from Gregoire Lake, Alberta, 2007...... 12 Figure 8. Age‐class distribution of walleye from Ethel Lake, Alberta, 2007...... 13 Figure 9. Length‐at‐age relationship for walleye from Ethel Lake, Alberta, 2007...... 13 Figure 10. Age‐at‐maturity of male walleye from Ethel Lake, Alberta, 2007...... 14 Figure 11. Age‐at‐maturity of female walleye from Ethel Lake, Alberta, 2007...... 14 Figure 12. Age‐class distribution of walleye from Hilda Lake, Alberta, 2007...... 15 Figure 13. Length‐at‐age relationship for walleye from Hilda Lake, Alberta, 2007...... 16 Figure 14. Age‐at‐maturity of male walleye from Hilda Lake, Alberta, 2007 ...... 16 Figure 15. Age‐at‐maturity of female walleye from Hilda Lake, Alberta, 2007...... 17

v LIST OF APPENDICES

Appendix 1. Net location, set and inspection times for the survey of Gregoire Lake, Alberta, 2007...... 20 Appendix 2. Net location, set and inspection times for the survey of Ethel Lake, Alberta, 2007...... 21 Appendix 3. Net location, set and inspection times for the survey of Hilda Lake, Alberta, 2007...... 21 Appendix 4. Biological data collected from walleye during the survey of Gregoire Lake, Alberta, 2007...... 22 Appendix 5. Biological data collected from non‐target fish species during the survey of Gregoire Lake, Alberta, 2007...... 30 Appendix 6. Standardized probability density function of walleye catch rate from Gregoire Lake, Alberta, 2007 ...... 38 Appendix 7. Biological data collected from walleye during the survey of Ethel Lake, Alberta, 2007...... 39 Appendix 8. Biological data collected from non‐target fish species during the survey of Ethel Lake, Alberta, 2007...... 44 Appendix. 9. Standardized probability density function of walleye catch rate from Ethel Lake, Alberta, 2007...... 50 Appendix 10. Biological data collected from walleye during the survey of Hilda Lake, Alberta, 2007...... 51 Appendix 11. Biological data collected from non‐target fish species during the survey of Hilda Lake, Alberta, 2007...... 56 Appendix. 12. Standardized probability density function of walleye catch rate from Hilda Lake, Alberta, 2007...... 64

1.0 INTRODUCTION

Angling pressure on sport fish in Alberta, particularly walleye (Sander vitreus), has been increasing for many years. A large number of licensed anglers, relatively few lakes, and slow‐growing, late‐maturing fish have put Alberta’s walleye population under stress (Sullivan 2003). By 1990, relatively unrestricted fishing pressure on walleye across Alberta had caused many walleye populations to decline to a small fraction of their former abundance (Sullivan 2003). To recover and protect exploited walleye populations, Alberta Sustainable Resource Development (ASRD) created the Alberta Walleye Management and Recovery Plan (WMRP) in 1995. Under the WMRP, lakes were classified into one of four general categories based on the state of the walleye fishery. The four categories included: collapsed, vulnerable, stable, and trophy (Berry 1995). Using this classification, each lake was assigned a corresponding sport fishing regulation (Sullivan 2003).

As part of the WMRP, I conducted gill netting surveys at Gregoire, Ethel, and Hilda lakes during the fall of 2007 to obtain information on the abundance and population structure of walleye in these lakes. The information collected in these surveys will allow ASRD to evaluate the effect of current sport fish regulations on the fisheries at these lakes and will inform future management decisions. Based on WMRP criteria, the walleye fisheries in both Ethel and Gregoire lakes are classified as collapsed, and both lakes are managed (since 1996 for Ethel and 1998 for Gregoire) with a zero walleye possession limit (catch‐and‐release only) regulation. The Hilda Lake walleye fishery is currently classified as vulnerable, and since 2004 has been managed with a one walleye possession and ≥ 500 mm minimum total length (TL) regulation.

2.0 STUDY AREAS

2.1 Gregoire Lake

Gregoire Lake (56° 27ʹ N 110° 09ʹ W) is located within the Athabasca River drainage, approximately 350 km northeast of Edmonton and 30 km southeast of Fort McMurray, Alberta (Figure 1). It has a surface area of 2,580 ha, a mean depth of 3.9 m and a maximum depth of 7.2 m. It is primarily fed by several small creeks on the southwest

1 and is drained by the Gregoire River, which flows from the southeast into the Clearwater River (Mitchell and Prepas 1990). Gregoire Lake can be accessed from secondary Highway 881 east of Highway 63. There is considerable development around the lake. The Hamlet of Anzac is located on the east shore of the lake and includes a provincial day use area with informal boat launch. The largest recreational development is Gregoire Lake Provincial Park located on the northwest shore. There are three treaty reserves, Gregoire Lake Reserves 176, 176a, and 176b, located on the south and northeast shores. An Amoco in‐situ oil plant is located within reserve 176 and a large oil‐sands development (Long Lake Project) is being constructed east of the lake (Swanson and Zurawell 2006).

2.2 Ethel Lake

Ethel Lake (54° 32ʹ N 110° 21ʹ W) is located in the Beaver River drainage, approximately 225 km northeast of Edmonton and 18 km northwest of Cold Lake, Alberta (Figure 2). It has a surface area of 490 ha, a mean depth of 6.6 m and a maximum depth of 30 m. The major inflows to the lake are Marie Creek on the north shore and an unnamed creek that flows in from Hilda Lake on the southwest shore. The lake is drained by Marie Creek on the southeast shore. Ethel Lake can be reached by either Ethel Lake Road or Primrose Lake Road north of Highway 55, which provides access to a provincial recreation area located on the northeast shore of the lake. The recreation area contains 14 campsites, a day use area and a boat launch. There is a small cottage development and a few permanent residences on the northeast side of the lake adjacent to the recreation area (Mitchell and Prepas 1990).

2.3 Hilda Lake

Hilda Lake (54° 31ʹ N 110° 25ʹ W) is located within the Beaver River drainage, approximately 220 km northeast of Edmonton and 20 km northwest of Cold Lake, Alberta (Figure 3). Hilda Lake has a surface area of 356 ha, a mean depth of 6.2 m and a maximum depth of 14 m. It is fed by several small creeks on the west shore and is drained by an outflow on the east shore, which empties into Ethel Lake. The lake is accessed by Ethel Lake Road north of Highway 55, which leads to an unimproved boat launch on the southeast shore. There is a small cottage development on the east side of the lake.

Figure 1. Map of Gregoire Lake, Alberta showing sampling sites. Inset is map of Alberta showing the location of the lake within the province.

Figure 2. Map of Ethel Lake, Alberta showing sampling sites. Inset is a map of Alberta showing the location of the lake within the province.

Figure 3. Map of Hilda Lake, Alberta showing sampling sites. Inset is map of Alberta indicating the location of the lake within the province.

5 3.0 MATERIALS AND METHODS

3.1 Sampling design

I examined relative abundance and population structure of walleye in Gregoire, Ethel and Hilda lakes between 11 and 22 September 2007 using a modified (see Sullivan and Park 2004) Fall Walleye Index Netting (FWIN) protocol developed by the Ontario Ministry of Natural Resources (Morgan 2000). Under this protocol, demographic data on walleye populations were collected over a short time period (e.g., 3 d) during the fall season. By ensuring that surveys were completed within a narrow time frame and under moderate water temperatures (10 – 15°C), the FWIN approach provides snapshots of population structure while minimizing complications associated with long‐term or seasonal variations in growth and age of fish (Morgan 2000). FWIN catch data were validated as an appropriate index of walleye abundance using population density estimates and angler total catch rate data (Sullivan and Park 2004).

I used 1.8 m deep by 61 m long multi‐panel monofilament gill nets to capture walleye. Each net consisted of eight, 7.6 x 1.8 m panels of different mesh sizes: 25, 38, 51, 64, 76, 102, 127, and 152 mm stretched mesh. Sampling effort was determined by monitoring sampling precision and biological sample size. For this assessment, achieving a ≤ 20% level of standard error between catches or a biological sample size of approximately 200 walleye was considered adequate following Morgan (2000). However, the standard error between catches was monitored and if a ≤ 20% level was not achieved with the prescribed effort and biological sample size, netting was stopped and the existing level of standard error was used.

To ensure uniform catchability, I used a stratified‐random design to select sampling sites at each lake, using depth zones (shallow 2 ‐ 5 m and deep 5 ‐ 15 m) and surface area as strata. I divided the surface of each lake into 1‐km2 sampling units corresponding to a Universal Transverse Mercator (UTM) grid. Each UTM grid was then sub‐divided into four 0.25‐km2 quadrats. Sampling sites were located within a randomly selected quadrat from a randomly selected UTM grid (i.e., both grids and quadrats were randomly selected). I used bathymetric data to calculate a ratio of surface area between the two depth strata following procedures in Morgan (2000), and

6 used this ratio to allocate number of nets proportionally to the two depth strata. Nets were set in the centre of each randomly selected quadrat, whenever possible, or within 250 m of the centre. To reduce potential sampling bias from variation in the lake habitat, areas along steep gradients, drop‐offs, or heavy vegetation were avoided. If the desired depth or suitable topography was not found within 250 m of the selected quadrat centre, that quadrat was replaced with the next randomly selected quadrat in the sequence. To reduce effects of local fish depletion, nets were set no less than 500 m apart. For each lake, I set nets on consecutive days. Soak time per net was approximately 24 h (range = 21 – 27 h) per set period. Based on this sampling design, 18 nets (13 shallow and 5 deep) were set in Gregoire Lake between 11 and 13 September 2007 for an average net soak time of 23.3 h per set period (range = 21.9 – 26.4 h; Appendix 1). Nine nets (4 shallow and 5 deep) were set in Ethel Lake between 19 and 21 September 2007 for an average net soak time of 23.4 h per set period (range = 22.5 – 24.8 h; Appendix 2). Nine nets (3 shallow and 6 deep) were set in Hilda Lake between 19 and 21 September 2007 for an average net soak time of 23.8 h per set period (range = 23.2 – 24.5 h; Appendix 3).

3.2 Biological data

I recorded the species and number of all fish caught, and bagged fish separately by mesh size (i.e., by panel) for each net. I collected data on fork length (FL) and TL (± 1 mm), total weight (± 1 g), sex and state of maturity. Fish were described as sexually mature if they appeared able to spawn during the next spawning season (Duffy et al. 2000). To determine age of walleye, I collected otoliths and the first three rays of the left pelvic fin. Ages were determined according to Mackay et al. (1990). Age‐0 walleye were determined from fork length (FL), with walleye < 130 mm recorded as age‐0.

3.3 Data analysis

I plotted weight‐length and length‐age relationships to identify and investigate any outliers. Outliers were omitted if measurement or recording error was suspected. To aid in classifying the state of the walleye fishery, I examined age‐class distributions, length‐at‐age, and age‐at‐maturity relationships from net catches. Age‐at‐maturity was determined as the age at which 50% of fish were mature. Following the WMRP,

7 evaluation of demographic attributes (e.g., growth rate, age‐at‐maturity, etc.) was based on fish ≥ 500 mm FL. I described growth rate using the von Bertalanffy (1938) growth model:

‐K (t‐ )t = 0 Lt ∞ (1L ‐ )e where,

Lt = length at age t,

L∞ = maximum theoretical length that can be attained, K = coefficient of growth, t = age, in years (y), and

t0 = theoretical time, in years, when the fish was size zero.

L∞, K, and t0 were calculated using the Fishery Analysis and Simulation Tools ver. 3.0 (Slipke and Maceina 2006). The length‐at‐age data were fitted to the growth model by applying the equation independently to each average FL per age‐class. Following Sullivan (1994) and Berry (1995), walleye length‐at‐age data were plotted as FL at a given age.

I used a bootstrap technique to estimate mean catch rate of walleye (expressed as fish/100 m2/24 h) and associated 95% confidence intervals (CI) following procedures in Haddon (2001) and Sullivan (2004).

All data collected were stored in the Fisheries Management Information System (FMIS) maintained by ASRD under Project IDs 7676 (Gregoire Lake), 7701 (Hilda Lake), and 7681 (Ethel Lake).

8 4.0 RESULTS

4.1 Capture data

4.1.1 Gregoire Lake

Nets set at Gregoire Lake captured 234 walleye (Appendix 4). Also captured were 83 yellow perch (Perca flavescens), 114 northern pike (Esox lucius), 55 lake whitefish (Coregonus clupeaformis), 62 cisco (Coregonus artedi), 34 white sucker (Catostomus commersoni), eight spottail shiner (Notropis hudsonius), and one trout perch (Percopsis omiscomaycus) (Appendix 5). Estimated catch rate of walleye was 11.8 fish/100 m2/24 h (95% CI = 8.7 ‐ 16.6, n = 18; Appendix 6).

4.1.2 Ethel Lake

Nets set at Ethel Lake captured 134 walleye (Appendix 7). Also captured were 101 yellow perch, 134 northern pike, 12 lake whitefish, 26 cisco, and 29 white sucker (Appendix 8). Estimated catch rate of walleye was 14.0 walleye/100 m2 /24 h (95% CI =

9.0 – 19.0, n = 9; Appendix 9).

4.1.3 Hilda Lake

Nets set at Hilda Lake captured 149 walleye (Appendix 10). Also captured were 139 yellow perch, 48 northern pike, 42 cisco, and 19 white sucker (Appendix 11). Estimated catch rate of walleye was 15.1 walleye/100 m2/24 h (95% CI = 10.1 – 19.8, n = 9; Appendix 12).

4.2 Walleye population structure

4.2.1 Gregoire Lake

Walleye from Gregoire Lake displayed a broad age‐class distribution with a mean (± SE) age of 8.9 ± 0.3 y (n = 233). Based on WMRP criteria, the age‐class distribution was moderately unstable. Strong year classes were ages‐1, 3, 10 and 13, and ages‐7, 8, 14 and 18 fish were nearly absent from the catch. Overall, older fish (> 15 y) were poorly represented in the catch (Figure 4).

9 2.5 h)

/24 2.0 2 m

1.5

1.0 (walleye/100

0.5 rate

0.0 Catch 048121620 Age (y)

Figure 4. Age‐class distribution of walleye from Gregoire Lake, Alberta, 2007.

The Gregoire walleye fishery was likely composed of slow or very slow growing fish.

Estimated average maximum size (L∞) of walleye from the von Bertalanffy growth function was 509.0 mm, with a growth coefficient K = 0.279, and t0 = −0.82. Based on these estimates, the average walleye from Gregoire Lake would reach 500 mm FL (the WMRP standard size) at age‐14. The youngest walleye observed to reach 500 mm FL was age‐9 (Figure 5).

Gregoire Lake walleye appeared to be early‐maturing (< 8 y). Of 222 walleye examined in 2007, 42% (n = 93) were mature males and 34% (n = 75) were mature females; the remaining walleye were immature. Male walleye matured at age‐4 (Figure 6) and female walleye matured at age‐6 (Figure 7).

10 700 600 500 (mm) 400 300 length 200

Fork Sample age and length 100 von Betalanffy growth curve 0 048121620 Age (y)

Figure 5. Length‐at‐age relationship for walleye from Gregoire Lake, Alberta, 2007. The von Bertalanffy growth curve is shown by the solid line. K = 0.279, t0 = −0.82, L∞ = 509.0 mm FL, n = 233.

h) 1.5 Immature males /24 2

m Mature males 1.0 (walleye/100

0.5 rate

0.0 Catch 0 4 8 12 16 20

Age (y)

Figure 6. Age‐at‐maturity of male walleye from Gregoire Lake, Alberta, 2007 (n = 114).

11 1.5 h) Immature females /24 2 Mature females m 1.0

0.5 (walleye/100

rate

0.0

Catch 048121620

Age (y)

Figure 7. Age‐at‐maturity of female walleye from Gregoire Lake, Alberta, 2007 (n = 108).

4.2.2 Ethel Lake

Walleye from Ethel Lake displayed a broad age‐class distribution with a mean (± SE) age of 8.5 ± 0.4 y (n = 129). Based on WMRP criteria, the age‐class distribution was moderately unstable with high catches of ages‐4, 9 and 17 walleye, and moderate catches of ages‐2 to 6, 10 and 11 walleye. Very few young‐of‐year (YOY) and age‐1 walleye were caught, and no walleye ages‐12 to 15 were captured (Figure 8).

The Ethel Lake walleye fishery was likely composed of slow or very slow growing fish. The youngest walleye sampled from Ethel Lake to reach 500 mm FL was age‐9. The average walleye was predicted to reach 500 mm FL at approximately age‐13 (Figure 9).

12 h) 3.0 /24 2

m 2.5

2.0

1.5 (walleye/100

1.0 rate

0.5

0.0 Catch 0 4 8 12 16 20

Age (y)

Figure 8. Age‐class distribution of walleye from Ethel Lake, Alberta, 2007. Mean (± SE) age was 8.5 ± 0.4 y, n = 129.

700 600

500 (mm) 400 300 length 200 Sample age and length Fork 100 von Betalanffy growth curve 0 048121620 Age (y)

Figure 9. Length‐at‐age relationship for walleye from Ethel Lake, Alberta, 2007. The von Bertalanffy growth curve is shown by the solid line. K = 0.188, t0 =‐ 1.232, L∞ = 551.5 mm, n = 129.

13 Ethel Lake walleye appeared to be early‐maturing (< 8 y). Of 128 walleye examined in 2007, 56% (n = 72) were mature males and 16% (n = 21) were mature females; the remaining walleye were immature. Male walleye matured at age‐4 (Figure 10) and female walleye matured at age‐7 (Figure 11).

h) 2.5 Immature males /24 2

m 2 Mature males 100 1.5

1 (walleye/

rate 0.5

0 Catch 048121620

Age (y)

Figure 10. Age‐at‐maturity of male walleye from Ethel Lake, Alberta, 2007 (n = 92).

h) 2.5 Immature females /24 2 m

2 Mature females 100 1.5

1 (walleye/

rate 0.5

0 Catch 048121620

Age (y)

Figure 11. Age‐at‐maturity of female walleye from Ethel Lake, Alberta, 2007 (n = 36).

14 4.2.3 Hilda Lake

Walleye from Hilda Lake displayed a narrow age‐class distribution with a mean (± SE) age of 7.1 ± 0.2 y (n = 145). Based on WMRP criteria, the age‐class distribution was unstable with ages‐7, 8 and 9 supporting the fishery. YOY and ages‐2, 3 and 5 were less abundant, and there were few fish older than age‐9 (Figure 12).

h) 8.0

/24 7.0 2 m 6.0 5.0 4.0 3.0 (walleye/100

2.0 rate

1.0

Catch 0.0 048121620 Age (y)

Figure 12. Age‐class distribution of walleye from Hilda Lake, Alberta, 2007. Mean (± SE) age was 7.1 ± 0.2 y, n = 145.

The Hilda Lake walleye fishery was likely composed of slow or very slow growing fish. The youngest walleye sampled from Hilda Lake to reach 500 mm FL was age‐9. The average walleye was predicted to reach 500 mm FL at approximately age‐13 (Figure 13).

Hilda Lake walleye appeared to be early‐maturing (< 8 y). Of 135 walleye examined in 2007, 38% (n = 51) were mature males and 47% (n = 64) were mature females; the remaining walleye were immature. Both male and female walleye matured at age‐5 (Figures 14 and 15).

15 700 600 500 (mm) 400

300 length

200 Sample age and length Fork 100 von Betalanffy growth curve 0 048121620 Age (y)

Figure 13. Length‐at‐age relationship for walleye from Hilda Lake, Alberta, 2007. The von Bertalanffy growth curve is shown by the solid line. K = 0.176, t0 = ‐ 1.601, L∞ = 551.5 mm, n = 145.

h) 5 Immature males /24 2 m 4 Mature males 100 3

2 (walleye/

rate 1

0 Catch 048121620

Age (y)

Figure 14. Age‐at‐maturity of male walleye from Hilda Lake, Alberta, 2007 (n = 56).

16 h)

5 /24 2 Immature females m

4 Mature females 100 3

2 (walleye/

rate 1

0 Catch 048121620

Age (y)

Figure 15. Age‐at‐maturity of female walleye from Hilda Lake, Alberta, 2007 (n = 79).

4.3 Stock assessment summaries

Walleye sampled from Gregoire Lake had a broad age‐class distribution that was moderately unstable. The average walleye reached 500 mm FL at age‐14. Male walleye reached maturity at age‐4, whereas female walleye reached maturity at age‐6. The catch rate of walleye was 11.8 walleye/100 m2 /24 h.

Walleye sampled from Ethel Lake had a broad age‐class distribution that was moderately unstable. The average walleye reached 500 mm FL at age‐13. Male walleye reached maturity at age‐4, whereas female walleye reached maturity at age‐7. The catch rate of walleye was 14.6 walleye/100 m2 /24 h.

Walleye sample from Hilda Lake had a narrow and unstable age‐class distribution. The average walleye reached 500 mm FL at age‐13. Male and female walleye both reached maturity at age‐5. The catch rate of walleye was 15.1 walleye/100 m2 /24 h.

17 5.0 LITERATURE CITED

Berry, D. 1995. Alberta’s walleye management and recovery plan. Alberta Fish and Wildlife Division, Edmonton, Alberta, Canada. 32 pp.

Duffy, M., J. McNulty, and T. Mosindy. 2000. Identification of sex, maturity and gonad condition of walleye Stizostedion vitreum vitreum. Ontario Ministry of Natural Resources, Thunder Bay, Ontario, Canada. 33 pp.

Haddon, M. 2001. Modeling and quantitative methods in fisheries. Chapman and Hall/CRC, Boca Raton, Florida, USA. 406 pp.

Mackay, W.C., G.R. Ash, and H.J. Norris. 1990. Fish ageing methods for Alberta. R.L. & R. Environmental Services Ltd., in association with Alberta Fish and Wildlife Division and University of Alberta, Edmonton, Alberta, Canada. 113 pp.

Mitchell, P., and E. Prepas. 1990. Atlas of Alberta lakes. University of Alberta Press, Edmonton, Alberta, Canada. 675 pp.

Morgan, G.E. 2000. Manual of instructions, Fall Walleye Index Netting (FWIN). Ontario Ministry of Natural Resources, Fish and Wildlife Branch, Peterborough, Ontario, Canada. 37 pp.

Slipke, J., and M. Maceina. 2006. Fishery analyses and simulations tools (FAST), version 3.0. Auburn University, Department of Fisheries and Allied Aquacultures, Auburn, Alabama, USA.

Sullivan, M.G. 2003. Active management of walleye fisheries in Alberta: dilemmas of managing recovering fisheries. North American Journal of Fisheries Management 23: 1343‐1358.

Sullivan, M.G. 2004. Computer simulation of sport fishery parameters. Alberta Fish and Wildlife Division, Edmonton, Alberta, Canada. 16 pp.

18 Sullivan, M.G., and D. Park. 2004. Alberta walleye index netting protocols: summary of joint ACA/SRD index netting subcommittee. Alberta Fish and Wildlife Division and Alberta Conservation Association, Edmonton, Alberta, Canada. 13 pp.

Swanson, H., and R. Zurawell. 2006. Gregoire Lake water quality monitoring report. Provincial Parks Lake Monitoring Program, Monitoring and Evaluation Branch, Environmental Assurance Division, Alberta Environment, Edmonton, Alberta, Canada. 26 pp. von Bertalanffy, L. 1938. A quantitative theory of organic growth. Human Biology 10: 181‐213.

6.0 APPENDICES

Appendix 1. Net location, set and inspection times for the survey of Gregoire Lake, Alberta, 2007.

Net Set Depth UTM UTM Net Inspection Net soak Number stratum Easting Northing set date Date (h) 46 Deep 490350 6257820 11‐Sep‐2007 12‐Sep‐2007 23.5 73 Shallow 491390 6260182 11‐Sep‐2007 12‐Sep‐2007 24.1 79 Shallow 491969 6257267 11‐Sep‐2007 12‐Sep‐2007 26.4 87 Shallow 492417 6255232 11‐Sep‐2007 12‐Sep‐2007 25.4 54 Deep 490932 6256219 11‐Sep‐2007 12‐Sep‐2007 23.2 98 Shallow 492940 6255236 11‐Sep‐2007 12‐Sep‐2007 23.5 59 Deep 491016 6258674 12‐Sep‐2007 13‐Sep‐2007 23.4 34 Deep 489987 6257322 12‐Sep‐2007 13‐Sep‐2007 23.7 14 Shallow 489106 6257822 12‐Sep‐2007 13‐Sep‐2007 23.4 80 Shallow 491933 6257748 12‐Sep‐2007 13‐Sep‐2007 22.0 114 Shallow 493958 6255222 12‐Sep‐2007 13‐Sep‐2007 21.9 126 Shallow 494955 6256331 12‐Sep‐2007 13‐Sep‐2007 22.6 28 Shallow 489482 6259779 13‐Sep‐2007 14‐Sep‐2007 22.3 43 Deep 490507 6256288 13‐Sep‐2007 14‐Sep‐2007 22.6 63 Shallow 491464 6255389 13‐Sep‐2007 14‐Sep‐2007 22.4 93 Shallow 492614 6258292 13‐Sep‐2007 14‐Sep‐2007 22.5 107 Shallow 493420 6255238 13‐Sep‐2007 14‐Sep‐2007 23.3 116 Shallow 494141 6256318 13‐Sep‐2007 14‐Sep‐2007 23.1

Appendix 2. Net location, set and inspection times for the survey of Ethel Lake, Alberta, 2007.

Net Set Depth UTM UTM Net Inspection Net soak Number stratum Easting Northing set date date (h) 6 Deep 541612 6041701 19‐Sep‐2007 20‐Sep‐2007 24.0 8 Deep 541506 6042663 19‐Sep‐2007 20‐Sep‐2007 23.1 27 Shallow 542879 6043127 19‐Sep‐2007 20‐Sep‐2007 24.8 2 Shallow 540878 6042119 20‐Sep‐2007 21‐Sep‐2007 23.2 15 Deep 541951 6043196 20‐Sep‐2007 21‐Sep‐2007 23.4 28 Shallow 543145 6043583 20‐Sep‐2007 21‐Sep‐2007 23.2 13 Shallow 542010 6042110 21‐Sep‐2007 22‐Sep‐2007 23.0 21 Deep 542655 6043056 21‐Sep‐2007 22‐Sep‐2007 22.5 22 Deep 542504 6043612 21‐Sep‐2007 22‐Sep‐2007 23.0

Appendix 3. Net location, set and inspection times for the survey of Hilda Lake, Alberta, 2007.

Net Set Depth UTM UTM Net Inspection Net soak number stratum Easting Northing set date date (h) 8 Deep 536480 6041335 19‐Sep‐2007 20‐Sep‐2007 23.3 27 Shallow 537819 6043230 19‐Sep‐2007 20‐Sep‐2007 23.8 15 Deep 537073 6042800 19‐Sep‐2007 20‐Sep‐2007 24.5 18 Deep 537419 6041826 20‐Sep‐2007 21‐Sep‐2007 24.2 14 Shallow 537011 6042410 20‐Sep‐2007 21‐Sep‐2007 24.2 20 Deep 537451 6042866 20‐Sep‐2007 21‐Sep‐2007 23.9 16 Shallow 537420 6040836 21‐Sep‐2007 22‐Sep‐2007 23.6 12 Deep 536956 6041324 21‐Sep‐2007 22‐Sep‐2007 23.2 13 Deep 536991 6041909 21‐Sep‐2007 22‐Sep‐2007 23.3

Appendix 4. Biological data collected from walleye during the survey of Gregoire Lake, Alberta, 2007. Abbreviations: WALL = walleye, M = male, F = female, U = unidentified.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) WALL 1 476 1,240 M Mature 13 WALL 6 317 320 F Immature 3 WALL 7 509 1,360 M Mature 18 WALL 8 479 1,220 M Mature 13 WALL 10 502 1,580 F Mature 10 WALL 11 482 1,190 M Mature 20 WALL 12 586 2,070 F Mature 17 WALL 13 472 1,110 M Mature 11 WALL 14 502 1,250 F Mature 16 WALL 15 454 940 M Mature 17 WALL 16 499 1,300 M Mature 19 WALL 17 450 1,050 M Mature 8 WALL 18 545 1,930 F Mature 13 WALL 20 557 1,800 F Mature 13 WALL 22 252 170 U Immature 2 WALL 36 350 510 M Mature 3 WALL 39 320 400 F Immature 3 WALL 42 335 440 F Immature 3 WALL 43 390 680 F Immature 4 WALL 44 477 1,250 M Mature 13 WALL 45 433 1,000 M Mature 6 WALL 46 507 1,610 F Mature 10 WALL 47 482 1,300 M Mature 10 WALL 49 538 1,800 F Mature WALL 50 445 1,020 M Mature 10 WALL 56 509 1,530 M Mature 17 WALL 57 500 1,580 F Mature 11 WALL 61 113 13 U Immature 0 WALL 62 190 67 U Immature 1

Appendix 4. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) WALL 79 322 395 M Immature 3 WALL 80 210 95 F Immature 1 WALL 81 234 127 M Immature 2 WALL 86 328 370 M Immature 3 WALL 87 328 370 U Immature 3 WALL 88 340 450 U Immature 3 WALL 89 375 620 F Immature 4 WALL 90 460 1,190 M Mature 13 WALL 91 465 1,200 M Mature 10 WALL 92 487 1,350 M Mature 12 WALL 93 467 1,220 M Mature 10 WALL 94 492 1,440 M Mature 17 WALL 98 339 420 U Immature 3 WALL 99 330 390 M Immature 3 WALL 100 521 1,730 F Mature 10 WALL 101 365 550 M Immature 3 WALL 102 409 850 M Mature 5 WALL 103 438 1,000 M Mature 7 WALL 104 425 900 M Mature 15 WALL 105 431 1,020 M Mature 10 WALL 106 449 1,437 M Mature 12 WALL 107 450 1,246 M Mature 13 WALL 108 453 1,146 M Mature 9 WALL 109 455 1,029 M Mature 13 WALL 118 550 2,104 F Mature 11 WALL 119 494 1,731 M Mature 11 WALL 123 116 16 U Immature 0 WALL 138 235 133 F Immature 1 WALL 139 201 93 F Immature 1 WALL 140 213 103 F Immature 1 WALL 141 214 106 M Immature 1

Appendix 4. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) WALL 142 207 101 M Immature 1 WALL 143 220 120 F Immature 1 WALL 144 217 109 F Immature 1 WALL 145 202 97 M Immature 1 WALL 146 205 98 F Immature 1 WALL 147 233 135 M Immature 2 WALL 152 340 469 M Mature 3 WALL 153 312 374 M Mature 3 WALL 154 302 296 F Immature 3 WALL 155 460 1,092 M Mature 10 WALL 156 461 1,229 M Mature 10 WALL 157 483 1,358 M Mature 16 WALL 161 470 1,238 M Mature 10 WALL 162 326 394 F Immature 3 WALL 163 396 728 M Mature 6 WALL 164 469 1,355 F Mature 10 WALL 165 316 343 M Immature 3 WALL 166 470 1,395 F Mature 7 WALL 167 445 1,045 M Mature 6 WALL 168 451 1,047 M Mature 10 WALL 169 381 608 M Mature 6 WALL 172 460 1,073 M Mature 12 WALL 173 433 915 M Mature 9 WALL 174 473 1,212 M Mature 12 WALL 175 448 1,125 M Mature 10 WALL 176 446 1,130 M Mature 11 WALL 177 538 1,991 F Mature 9 WALL 178 485 1,279 M Mature 15 WALL 179 525 1,945 F Mature 10 WALL 180 543 1,933 F Mature 12 WALL 181 496 1,576 M Mature 10

Appendix 4. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) WALL 182 580 2,362 F Mature 13 WALL 183 489 1,444 F Mature 6 WALL 185 526 1,773 F Mature 11 WALL 186 549 2,017 F Mature 10 WALL 187 520 1,790 F Mature 12 WALL 188 492 1,539 F Mature 10 WALL 189 530 1,717 F Mature 11 WALL 193 568 2,451 F Mature 13 WALL 198 264 183 U Immature 2 WALL 199 485 1,280 M Mature 19 WALL 200 475 1,240 M Mature 17 WALL 201 444 1,090 M Mature 9 WALL 203 100 11 U Immature 0 WALL 206 195 71 F Immature 1 WALL 228 437 927 M Mature 6 WALL 229 268 200 F Immature 2 WALL 230 362 556 M Mature 4 WALL 231 191 88 F Immature 1 WALL 232 225 123 M Immature 1 WALL 247 445 1,186 M Mature 14 WALL 248 345 452 F Immature 3 WALL 249 325 371 F Immature 3 WALL 250 323 399 F Immature 3 WALL 251 311 346 M Immature 3 WALL 252 379 598 M Mature 4 WALL 265 477 1,290 M Mature 13 WALL 266 468 1,199 F Mature 10 WALL 267 466 1,239 M Mature 10 WALL 268 468 1,404 M Mature 13 WALL 271 536 1,813 F Mature 10 WALL 272 465 1,251 M Mature 10

Appendix 4. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) WALL 273 489 1,249 M Mature 17 WALL 274 471 1,224 M Mature 13 WALL 275 487 1,291 M Mature 15 WALL 276 482 1,290 M Mature 13 WALL 277 525 1,639 F Mature 9 WALL 280 534 2,027 F Mature 10 WALL 281 525 1,594 F Mature 15 WALL 282 532 1,769 F Mature 10 WALL 283 554 2,027 F Mature 13 WALL 284 483 1,488 M Mature 10 WALL 290 215 101 M Immature 2 WALL 291 235 110 F Immature 2 WALL 292 518 1,459 M Mature 19 WALL 294 491 1,391 M Mature 13 WALL 295 451 918 M Mature 5 WALL 296 532 1,770 F Mature 10 WALL 297 535 1,686 F Mature 13 WALL 298 606 2,395 F Mature 13 WALL 299 473 1,051 M Mature 16 WALL 300 491 1,231 M Mature 17 WALL 301 500 1,463 F Mature 9 WALL 302 468 1,193 M Mature 15 WALL 303 538 1,654 F Mature 9 WALL 304 569 2,194 F Mature 13 WALL 307 279 228 F Immature 2 WALL 308 492 1,412 F Mature 11 WALL 310 525 1,508 F Mature 10 WALL 311 523 1,681 M Mature 17 WALL 312 510 1,643 F Mature 10 WALL 313 549 1,829 F Mature 13 WALL 314 538 1,704 F Mature 11

Appendix 4. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) WALL 315 492 1,430 M Mature 17 WALL 316 513 1,500 F Mature 17 WALL 317 531 1,630 F Mature 16 WALL 318 538 1,810 F Mature 13 WALL 319 540 1,960 F Mature 17 WALL 320 526 1,480 M Mature 20 WALL 321 556 1,830 F Mature 10 WALL 322 545 2,070 F Mature 13 WALL 323 468 1,300 M Mature 16 WALL 325 555 2,124 F Mature 13 WALL 326 583 2,165 F Mature 13 WALL 327 557 2,080 F Mature 13 WALL 328 571 2,174 F Mature 13 WALL 342 206 93 U Immature 1 WALL 346 336 440 F Immature 3 WALL 355 440 1,020 M Mature 10 WALL 356 433 1,010 M Mature 6 WALL 357 401 750 M Mature 4 WALL 358 447 1,100 M Mature 10 WALL 369 195 80 M Immature 1 WALL 370 264 183 M Immature 2 WALL 371 189 72 M Immature 1 WALL 376 323 340 M Immature 3 WALL 384 424 879 M Mature 5 WALL 385 457 1,027 F Immature 5 WALL 392 430 873 F Immature 5 WALL 397 357 501 M Mature 4 WALL 398 535 1,701 F Mature 15 WALL 407 433 954 M Mature 5 WALL 408 512 1,428 F Mature 10 WALL 409 502 1,382 F Mature 12

Appendix 4. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) WALL 411 554 2,086 F Mature 13 WALL 418 360 510 M Immature 3 WALL 419 510 1,510 F Mature 9 WALL 420 496 1,310 F Mature 9 WALL 421 419 860 F Immature 5 WALL 422 520 1,560 F Mature 11 WALL 423 553 1,980 F Mature 10 WALL 427 563 2,080 F Mature 10 WALL 431 520 1,620 F Mature 16 WALL 432 487 1,330 M Mature 13 WALL 433 451 1,120 F Immature 5 WALL 434 455 1,140 M Mature 17 WALL 437 576 1,890 F Mature 19 WALL 439 557 2,040 F Mature 16 WALL 440 113 12 U Immature 0 WALL 441 462 1,200 M Mature 10 WALL 443 452 1,070 M Mature 9 WALL 444 537 1,830 F Mature 10 WALL 456 255 175 F Immature 3 WALL 457 223 109 F Immature 1 WALL 458 250 165 F Immature 2 WALL 470 315 368 M Immature 3 WALL 476 353 577 F Immature 3 WALL 477 398 702 F Immature 5 WALL 478 415 903 M Mature 5 WALL 479 480 1,303 M Mature 10 WALL 488 438 1,050 M Mature 13 WALL 489 468 1,160 M Mature 13 WALL 490 475 1,270 F Immature 6 WALL 491 480 1,310 M Mature 13 WALL 492 462 1,270 M Mature 13

Appendix 4. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) WALL 493 446 1,010 M Mature 9 WALL 494 442 1,130 M Mature 10 WALL 495 544 2,020 F Mature 11 WALL 499 571 2,210 F Mature 13 WALL 500 528 1,858 F Mature 10 WALL 501 533 2,112 F Mature 13 WALL 502 545 2,081 F Mature 10 WALL 503 505 1,749 F Mature 10 WALL 504 463 1,377 M Mature 17 WALL 506 210 110 M Immature 1 WALL 509 504 1,540 F Mature 10 WALL 510 327 370 M Immature 3 WALL 511 379 640 M Mature 4 WALL 515 575 2,170 F Mature 13 WALL 519 519 1,489 F Mature 10 WALL 520 585 1,925 F Mature 16 WALL 522 565 2,165 F Mature 16 WALL 541 501 1,487 M Mature 10 WALL 564 533 1,703 F Mature 13

Appendix 5. Biological data collected from non‐target fish species during the survey of Gregoire Lake, Alberta, 2007. Abbreviations: CISC = cisco, LKWH = lake whitefish, NRPK = northern pike, SPSH = spottail shiner, TRPR = trout perch, M = male, F = female, U = unidentified.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) CISC 4 U Unknown CISC 5 190 93 U Immature CISC 84 200 100 U Immature CISC 85 204 104 M Mature CISC 136 143 43 U Unknown CISC 137 154 52 U Unknown CISC 151 195 107 U Unknown CISC 217 143 35 U Unknown CISC 218 155 48 U Unknown CISC 219 191 111 U Unknown CISC 220 145 45 U Unknown CISC 221 143 37 U Unknown CISC 222 145 42 U Unknown CISC 223 153 46 U Unknown CISC 224 146 46 U Unknown CISC 225 157 50 U Unknown CISC 226 153 46 U Unknown CISC 227 148 41 U Unknown CISC 234 195 104 U Unknown CISC 235 199 102 U Unknown CISC 236 205 122 U Unknown CISC 237 209 128 U Unknown CISC 238 230 159 U Unknown CISC 239 210 152 U Unknown CISC 240 220 178 U Unknown CISC 241 204 126 U Unknown CISC 242 215 146 U Unknown CISC 243 184 89 U Unknown

Appendix 5. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) CISC 244 189 99 U Unknown CISC 245 144 44 U Unknown CISC 246 188 89 U Unknown CISC 258 200 121 U Unknown CISC 259 246 187 U Unknown CISC 260 246 189 U Unknown CISC 261 196 122 U Unknown CISC 262 251 262 U Unknown CISC 263 229 172 U Unknown CISC 264 225 157 U Unknown CISC 330 90 10 U Unknown CISC 373 188 88 F Mature CISC 374 210 129 M Mature CISC 375 224 156 F Mature CISC 380 187 90 F Mature CISC 391 190 92 F Mature CISC 454 92 9 U Unknown CISC 455 100 11 U Unknown CISC 464 154 44 F Immature CISC 465 148 38 F Immature CISC 466 183 84 M Mature CISC 485 269 255 F Mature CISC 505 91 9 U Immature CISC 508 280 290 F Mature CISC 513 210 140 F Mature CISC 514 270 280 F Mature CISC 526 88 9 U Immature CISC 527 92 10 U Immature CISC 537 148 40 F Immature CISC 538 144 38 U Immature

Appendix 5. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) CISC 539 137 31 U Unknown CISC 540 146 41 F Immature CISC 546 191 97 M Mature CISC 547 192 91 F Mature LKWH 59 438 1,300 M Mature LKWH 111 502 2,046 M Mature LKWH 112 520 2,197 M Mature LKWH 113 490 1,740 F Mature LKWH 114 498 1,829 F Mature LKWH 120 524 2,070 M Mature LKWH 121 526 2,220 M Mature LKWH 122 534 2,300 M Mature LKWH 190 530 1,381 M Mature LKWH 191 483 1,607 M Mature LKWH 270 431 1,512 F Mature LKWH 285 455 1,386 F Mature LKWH 287 391 1,049 M Mature LKWH 288 502 2,034 M Mature LKWH 359 504 1,880 M Mature LKWH 360 403 940 F Immature LKWH 361 486 1,550 F Mature LKWH 366 438 1,433 F Mature LKWH 410 475 1,680 M Mature LKWH 412 430 1,308 M Mature LKWH 413 453 1,787 F Mature LKWH 414 460 1,594 M Mature LKWH 415 456 1,687 F Mature LKWH 416 506 1,231 M Mature LKWH 417 523 2,403 M Mature LKWH 424 406 1,040 M Mature

Appendix 5. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) LKWH 425 456 1,400 M Mature LKWH 428 514 2,040 M Mature LKWH 474 503 2,123 M Mature LKWH 497 506 1,790 M Mature LKWH 498 328 550 M Immature LKWH 521 509 2,172 F Mature LKWH 523 483 1,930 F Mature LKWH 545 225 145 M Immature LKWH 553 311 416 U Unknown LKWH 554 320 470 M Immature LKWH 555 232 157 F Immature LKWH 556 282 306 F Immature LKWH 563 330 510 M Immature LKWH 565 329 524 F Immature LKWH 566 320 499 F Immature LKWH 567 434 1,280 M Mature LKWH 568 428 1,094 M Mature LKWH 569 441 1,459 M Mature LKWH 570 467 1,535 M Mature LKWH 571 398 945 M Mature LKWH 572 450 1,420 M Mature LKWH 573 389 868 F Mature LKWH 574 446 1,734 F Mature LKWH 575 495 2,939 F Mature LKWH 576 444 1,582 F Mature LKWH 578 460 1,795 F Mature LKWH 579 497 1,886 M Mature NRPK 9 469 640 F Mature 3 NRPK 23 563 1,150 F Mature 4 NRPK 40 588 1,370 F Mature 4

Appendix 5. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) NRPK 48 557 960 F Mature 4 NRPK 58 775 3,320 F Mature 8 NRPK 95 756 3,020 F Mature 6 NRPK 96 702 2,440 F Mature 6 NRPK 110 665 1,928 M Mature 7 NRPK 124 509 788 M Mature 4 NRPK 125 570 1,072 F Mature 5 NRPK 126 555 1,105 F Mature 6 NRPK 148 513 990 M Mature 4 NRPK 158 415 595 M Mature 2 NRPK 159 535 960 F Mature 5 NRPK 160 378 382 F Immature 1 NRPK 170 492 749 M Mature 3 NRPK 171 494 816 M Mature 4 NRPK 184 640 1694 F Mature 6 NRPK 194 358 301 F Immature 1 NRPK 195 454 630 M Mature 3 NRPK 196 537 1,000 M Mature 4 NRPK 202 568 970 F Mature 5 NRPK 207 216 77 F Immature 0 NRPK 233 345 276 F Immature 1 NRPK 253 462 682 M Mature 3 NRPK 254 599 1,067 F Mature 6 NRPK 255 497 827 M Mature 4 NRPK 256 432 533 F Mature 2 NRPK 257 616 1,396 F Mature 6 NRPK 269 507 1,006 M Mature 4 NRPK 278 552 1,207 F Mature 4 NRPK 279 658 1,777 F Mature 6 NRPK 306 474 687 M Mature 3

Appendix 5. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) NRPK 309 630 1,395 F Mature 5 NRPK 324 535 1,010 M Mature 4 NRPK 329 583 1,264 F Mature 5 NRPK 331 543 721 F Mature 5 NRPK 332 430 644 M Mature 3 NRPK 343 590 1,210 F Mature 3 NRPK 344 665 1,770 F Mature 6 NRPK 347 572 968 F Mature 5 NRPK 348 425 572 M Mature 3 NRPK 349 390 418 M Mature 2 NRPK 350 553 1,021 F Mature 3 NRPK 351 525 882 M Mature 4 NRPK 352 477 707 M Mature 3 NRPK 353 439 591 M Mature 2 NRPK 354 478 807 M Mature 3 NRPK 377 661 1,971 F Mature 5 NRPK 378 635 1,617 F Mature 5 NRPK 381 559 1,144 F Mature 5 NRPK 382 495 859 M Mature 3 NRPK 383 555 1,081 F Mature 4 NRPK 386 568 1,195 F Mature 4 NRPK 387 501 848 F Mature 3 NRPK 388 492 725 F Mature 4 NRPK 389 336 255 F Immature 1 NRPK 390 360 332 F Immature 1 NRPK 393 545 1,134 M Mature 4 NRPK 394 547 1,153 F Mature 4 NRPK 395 531 889 F Mature 3 NRPK 396 443 525 M Immature 3 NRPK 399 545 1,063 F Mature 5

Appendix 5. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) NRPK 400 487 782 F Mature 3 NRPK 401 538 545 F Mature 5 NRPK 402 552 532 F Mature 3 NRPK 403 532 1,000 M Mature 5 NRPK 404 555 1,113 F Mature 5 NRPK 405 473 685 M Mature 4 NRPK 406 567 1093 F Mature 5 NRPK 430 410 490 M Mature 2 NRPK 435 522 780 M Mature 5 NRPK 436 547 1,070 F Mature 3 NRPK 438 765 2,860 F Mature 9 NRPK 442 419 500 M Mature 2 NRPK 445 671 2,100 F Mature 5 NRPK 459 580 1,288 F Mature 4 NRPK 460 587 1,455 F Mature 5 NRPK 461 646 1,154 F Mature 5 NRPK 467 777 3,388 F Mature 8 NRPK 468 333 287 M Mature 1 NRPK 469 478 825 F Mature 2 NRPK 471 418 483 M Mature 2 NRPK 472 397 450 M Mature 2 NRPK 473 514 1,020 M Mature 4 NRPK 480 589 1,326 F Mature 4 NRPK 481 590 1,303 F Mature 5 NRPK 482 515 915 M Mature 4 NRPK 483 518 973 M Mature 4 NRPK 484 867 5,000 F Mature 9 NRPK 496 740 1,650 F Mature 6 NRPK 507 552 990 M Mature 5 NRPK 512 512 890 M Mature 5

Appendix 5. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) NRPK 516 531 1,000 F Mature 4 NRPK 517 492 800 F Mature 3 NRPK 518 509 880 M Mature 3 NRPK 524 525 853 F Mature 4 NRPK 529 594 1,016 F Mature 4 NRPK 530 521 1,010 F Mature 4 NRPK 542 530 904 F Mature 5 NRPK 543 508 866 M Mature 5 NRPK 544 327 236 M Mature 1 NRPK 549 435 576 M Mature 3 NRPK 550 504 937 F Mature 4 NRPK 551 517 609 M Mature 5 NRPK 552 463 678 F Mature 3 NRPK 557 564 840 F Mature 5 NRPK 558 465 700 F Mature 3 NRPK 559 422 530 F Mature 2 NRPK 560 498 880 M Mature 3 NRPK 561 558 1,260 M Mature 3 NRPK 562 524 880 F Mature 5 NRPK 577 887 4,788 F Mature 10 SPSH 528 90 9 U Unknown TRPR 305 96 9 F Mature

Appendix 6. Standardized probability density function of walleye catch rate from Gregoire Lake, Alberta, 2007. Mean = 11.8 walleye/100 m2/ 24 h, 95% CI = 8.7 – 16.6, n = 18.

. 1.0

0.8 density

0.6

0.4 probability

0.2

0.0

Standardized 0 5 10 15 20 25

Catch rate (walleye/100 m2/24 h)

Appendix 7. Biological data collected from walleye during the survey of Ethel Lake, Alberta, 2007. Abbreviations: WALL = walleye, M = male, F = female, U = unidentified.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) WALL 16 295 229 M Immature 3 WALL 20 239 126 M Immature 2 WALL 21 252 163 M Immature 2 WALL 22 330 339 M Immature 4 WALL 23 234 114 M Immature 2 WALL 26 332 348 F Immature WALL 27 414 702 M Mature 8 WALL 28 462 1,115 M Mature 10 WALL 29 443 988 M Mature 9 WALL 30 504 1,354 F Mature 11 WALL 40 405 670 F Immature 5 WALL 41 460 1,037 M Mature 9 WALL 42 437 865 F Mature 7 WALL 43 404 712 M Mature 6 WALL 44 343 421 M Mature 4 WALL 45 351 463 M Mature 4 WALL 46 391 600 F Immature 4 WALL 51 455 1,004 M Mature 9 WALL 52 511 1,439 M Mature 17 WALL 53 538 1,495 F Mature 11 WALL 54 481 1,154 M Mature 9 WALL 58 501 1,528 M Mature 11 WALL 59 465 1,114 M Mature 10 WALL 66 336 366 F Immature 4 WALL 67 261 157 M Immature 3 WALL 68 246 155 M Immature 3 WALL 69 573 1,913 F Mature 11 WALL 73 526 1,412 M Mature 17 WALL 74 449 1,027 M Mature 9

Appendix 7. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) WALL 75 457 1,033 M Mature 10 WALL 76 454 1,006 M Mature 11 WALL 77 400 639 M Mature 6 WALL 82 468 1,045 M Mature 16 WALL 83 362 483 M Mature 4 WALL 84 399 702 M Mature 7 WALL 85 381 551 M Mature 6 WALL 86 419 833 M Mature WALL 87 377 576 M Mature 6 WALL 88 457 1,084 M Mature 9 WALL 89 475 1,200 M Mature 11 WALL 90 460 1,072 M Mature 9 WALL 93 478 1,209 M Mature 9 WALL 94 442 988 F Mature 5 WALL 95 516 1,471 F Mature 9 WALL 96 514 1,390 M Mature 17 WALL 98 450 994 M Mature 17 WALL 99 466 1,091 M Mature 11 WALL 100 531 1,659 F Mature 9 WALL 101 526 1,690 M Mature 17 WALL 102 584 1,965 F Mature 11 WALL 104 377 551 M Mature 5 WALL 122 443 963 M Mature 10 WALL 136 553 1,914 M Mature 16 WALL 137 520 1,534 F Mature 11 WALL 138 519 1,348 M Mature 17 WALL 139 466 941 M Mature 17 WALL 151 126 U Unknown 0 WALL 164 495 1,230 M Mature 17 WALL 165 554 1,690 F Mature 17

Appendix 7. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) WALL 181 335 401 F Immature 4 WALL 193 470 1,090 F Mature 9 WALL 194 489 1,140 M Mature 17 WALL 195 499 1,260 M Mature 17 WALL 207 213 100 M Immature 2 WALL 208 330 350 M Immature 4 WALL 209 218 100 M Immature 2 WALL 213 386 600 M Mature 7 WALL 214 382 575 M Mature 5 WALL 215 371 500 M Mature 6 WALL 216 338 390 M Immature 4 WALL 217 310 300 M Immature 4 WALL 221 476 1,238 M Mature 9 WALL 222 369 474 F Immature 6 WALL 223 374 569 F Immature 4 WALL 224 330 368 M Immature 4 WALL 232 512 1,563 F Mature 9 WALL 233 513 1,346 M Mature 17 WALL 234 500 1,194 M Mature WALL 235 511 1,328 M Mature 17 WALL 236 534 1,851 M Mature 10 WALL 257 536 1,590 F Mature 9 WALL 269 530 1,400 M Mature 17 WALL 270 482 1,060 M Mature 17 WALL 278 505 1,600 M Mature 16 WALL 295 400 650 F Immature 5 WALL 296 455 850 F Immature 9 WALL 306 404 620 M Mature 5 WALL 307 351 418 F Immature 4 WALL 308 391 640 M Mature 5

Appendix 7. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) WALL 314 535 1,450 M Mature 17 WALL 315 435 950 F Mature 6 WALL 316 513 1,325 M Mature 17 WALL 319 590 2,300 F Mature 10 WALL 323 378 513 M Mature 5 WALL 334 455 1,050 M Mature 9 WALL 335 248 150 M Immature 2 WALL 336 300 250 M Immature 3 WALL 343 260 160 M Immature 3 WALL 344 218 125 M Immature 2 WALL 345 353 500 F Immature 4 WALL 346 334 375 M Mature 4 WALL 348 367 599 M Mature 4 WALL 349 380 650 F Immature 4 WALL 350 265 200 M Immature 3 WALL 355 367 525 M Mature 5 WALL 356 389 575 M Mature 5 WALL 357 530 1,550 M Mature 17 WALL 358 500 1,250 M Mature 17 WALL 361 477 1,200 M Mature 9 WALL 362 477 1,250 F Mature 7 WALL 363 490 1,500 F Mature 7 WALL 364 480 1,200 M Mature 17 WALL 365 515 1,600 F Mature 9 WALL 366 542 1,700 F Mature 9 WALL 367 545 1,800 M Mature 17 WALL 374 238 150 M Immature 3 WALL 381 234 125 F Immature 2 WALL 382 495 1,175 M Mature 16 WALL 385 345 450 M Mature 4

Appendix 7. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) WALL 386 376 550 M Mature 5 WALL 387 312 300 M Immature 4 WALL 388 433 975 M Mature 10 WALL 389 393 650 F Immature 6 WALL 395 335 440 F Immature 4 WALL 396 422 677 M Mature 11 WALL 397 365 470 F Immature 5 WALL 404 444 1,050 M Mature 9 WALL 405 437 950 M Mature 6 WALL 406 506 1,475 F Mature 9 WALL 407 472 1,175 M Mature WALL 408 512 1,425 F Mature 10 WALL 409 488 1,225 M Mature 9 WALL 412 539 1,675 M Mature 11

Appendix 8. Biological data collected from non‐target fish species during the survey of Ethel Lake, Alberta, 2007. Abbreviations: CISC = cisco, NRPK = northern pike, LKWH = lake whitefish, WHSC = white sucker, YLPR = yellow perch, M = male, F = female, U = unidentified.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) CISC 18 371 680 M Mature CISC 19 360 773 M Mature CISC 97 398 925 U Unknown CISC 135 357 740 F Mature CISC 156 367 800 F Mature CISC 178 383 800 M Mature CISC 202 100 10 U Unknown CISC 203 104 10 U Unknown CISC 204 107 14 U Unknown CISC 205 104 11 U Unknown CISC 241 357 764 M Mature CISC 249 420 1,209 F Mature CISC 256 452 1,374 F Mature CISC 280 418 1,260 F Mature CISC 333 399 955 M Mature CISC 372 100 10 U Immature CISC 373 102 10 M Immature CISC 384 233 150 M Immature CISC 394 221 150 M Immature LKWH 144 530 2,519 M Mature LKWH 145 561 2,619 M Mature LKWH 146 458 1,288 M Mature LKWH 148 528 2,283 F Mature LKWH 279 501 1,940 F Mature LKWH 317 573 2,400 M Mature LKWH 320 504 1,900 M Mature LKWH 321 548 2,150 F Mature LKWH 393 285 350 M Immature LKWH 413 505 2,040 F Mature

Appendix 8. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) LKWH 414 520 2,275 F Mature LKWH 415 495 1,925 F Mature NRPK 1 618 1,556 F Mature 6 NRPK 2 548 1,056 F Mature 4 NRPK 24 424 568 F Mature 2 NRPK 31 427 545 F Mature 3 NRPK 32 490 626 M Mature 4 NRPK 33 390 404 M Mature 2 NRPK 34 402 432 M Mature 2 NRPK 35 459 475 M Mature 3 NRPK 36 479 785 F Mature 2 NRPK 37 443 586 M Mature 3 NRPK 38 425 542 F Mature 3 NRPK 39 480 739 F Mature 4 NRPK 47 573 1,220 F Mature 5 NRPK 48 452 395 M Mature 3 NRPK 49 471 703 M Mature 3 NRPK 50 514 911 F Mature 4 NRPK 55 725 2,850 M Mature 8 NRPK 70 458 728 F Mature 3 NRPK 71 645 1,558 F Mature 6 NRPK 78 470 782 M Mature 3 NRPK 79 456 592 F Mature 3 NRPK 80 536 1,151 F Mature 4 NRPK 91 516 847 M Mature 4 NRPK 92 538 1,206 F Mature 3 NRPK 103 429 612 M Mature 3 NRPK 105 573 1,296 F Mature 6 NRPK 106 535 1,221 M Mature 6 NRPK 107 520 713 M Mature 5 NRPK 108 376 591 M Mature 3

Appendix 8. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) NRPK 115 589 1,206 F Mature 5 NRPK 116 547 1,183 F Mature 5 NRPK 117 454 717 M Mature 3 NRPK 118 449 597 F Mature 3 NRPK 119 443 616 M Mature 3 NRPK 123 518 822 M Mature 5 NRPK 124 451 618 F Mature 3 NRPK 125 397 479 F Mature 2 NRPK 126 465 708 F Mature 3 NRPK 127 418 474 F Mature 2 NRPK 128 411 439 M Mature 3 NRPK 132 556 1,096 F Mature 4 NRPK 133 471 778 F Mature 4 NRPK 140 624 1,975 F Mature 5 NRPK 149 455 750 F Mature 3 NRPK 153 340 250 M Immature 1 NRPK 154 500 875 F Mature 4 NRPK 155 600 1,475 F Mature 4 NRPK 157 355 295 M Mature 1 NRPK 158 415 515 M Mature 2 NRPK 159 409 503 F Mature 3 NRPK 160 391 426 M Mature 2 NRPK 161 460 692 M Mature 2 NRPK 162 447 565 F Mature 2 NRPK 163 441 474 M Mature 2 NRPK 166 564 1,325 M Mature 4 NRPK 167 550 1,050 M Mature 4 NRPK 168 473 750 M Mature 3 NRPK 169 462 660 M Mature 3 NRPK 170 473 660 M Mature 2 NRPK 171 458 660 M Mature 3

Appendix 8. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) NRPK 172 395 420 M Mature 2 NRPK 173 385 375 M Mature 2 NRPK 182 560 1,062 F Mature 4 NRPK 183 530 1,040 F Mature 3 NRPK 184 605 1,293 F Mature 5 NRPK 185 530 838 F Mature 5 NRPK 186 505 762 F Immature 4 NRPK 187 447 740 M Mature 3 NRPK 200 515 950 F Mature 3 NRPK 201 465 650 F Mature 2 NRPK 210 628 1,550 F Mature 5 NRPK 211 387 450 M Mature 2 NRPK 218 490 775 M Mature 4 NRPK 219 360 300 M Mature 2 NRPK 220 396 450 M Mature 2 NRPK 225 452 619 F Mature 2 NRPK 226 517 937 F Mature 4 NRPK 227 481 773 M Mature 3 NRPK 228 494 890 F Mature 3 NRPK 238 535 1,050 F Mature 4 NRPK 239 467 706 M Mature 2 NRPK 242 411 510 M Mature 2 NRPK 243 445 590 M Mature 3 NRPK 246 497 907 F Mature 4 NRPK 247 412 464 F Mature 2 NRPK 250 512 1,044 M Mature 3 NRPK 251 578 1,320 F Mature 4 NRPK 252 447 644 F Mature 3 NRPK 253 500 977 F Mature 3 NRPK 254 474 777 M Mature 3 NRPK 258 557 1,068 F Mature 4

Appendix 8. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) NRPK 259 627 1,561 F Mature 6 NRPK 262 605 1,200 F Mature 7 NRPK 263 590 1,300 F Mature 5 NRPK 282 385 400 F Immature 2 NRPK 283 530 975 F Mature 5 NRPK 284 520 950 M Mature 4 NRPK 292 470 618 M Mature 4 NRPK 293 410 474 M Mature 3 NRPK 297 385 400 F Mature 2 NRPK 298 480 800 M Mature 3 NRPK 299 482 750 F Mature 3 NRPK 300 547 1,050 F Mature 5 NRPK 301 422 500 F Mature 2 NRPK 302 432 650 M Mature 3 NRPK 303 415 500 M Mature 3 NRPK 304 415 550 M Mature 3 NRPK 305 420 475 M Mature 3 NRPK 309 538 794 M Mature 5 NRPK 310 587 1,366 F Mature 3 NRPK 311 490 817 F Mature 3 NRPK 312 424 560 M Mature 2 NRPK 313 468 727 M Mature 3 NRPK 324 513 935 F Mature 3 NRPK 325 573 1,448 F Mature 5 NRPK 347 445 625 F Mature 3 NRPK 351 385 400 F Mature 3 NRPK 352 445 700 M Mature 3 NRPK 353 470 800 F Mature 3 NRPK 354 510 900 M Mature 3 NRPK 359 490 825 M Mature 4 NRPK 360 443 700 M Mature 3

Appendix 8. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) NRPK 368 860 6,450 F Mature 11 NRPK 375 417 600 M Mature 3 NRPK 376 466 775 F Mature 3 NRPK 383 415 530 M Mature 3 NRPK 390 420 550 M Mature 3 NRPK 391 525 950 F Mature 5 NRPK 392 443 590 F Mature 3 NRPK 398 520 964 F Mature 6 NRPK 399 509 769 F Mature 4 NRPK 400 424 559 M Mature 2 NRPK 401 492 749 F Mature 3 NRPK 402 441 610 M Mature 3

Appendix. 9. Standardized probability density function of walleye catch rate from Ethel Lake, Alberta, 2007. Mean = 14.0 walleye/ 100 m2/ 24 h, 95% CI = 9.0 – 19.0, n = 9.

1.0 density 0.8

0.6 . probability 0.4

0.2

0.0 Standardized 0 5 10 15 20 25 30

Catch rate (walleye/100 m2/24 h)

Appendix 10. Biological data collected from walleye during the survey of Hilda Lake, Alberta, 2007. Abbreviations: WALL = walleye, M = male, F = female, U = unidentified.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) WALL 1 113 12 U Unknown 0 WALL 4 369 535 M Mature 7 WALL 7 399 619 M Mature 8 WALL 8 427 757 M Mature 8 WALL 10 432 786 F Mature 9 WALL 11 419 686 M Mature 9 WALL 12 418 723 M Mature 9 WALL 13 418 743 M Mature 7 WALL 19 410 624 F Mature 7 WALL 20 455 887 M Mature 9 WALL 21 410 628 F Mature 7 WALL 22 377 519 M Mature 7 WALL 25 524 1,427 M Mature 17 WALL 26 449 823 F Mature 9 WALL 27 120 15 U Immature 0 WALL 28 120 17 U Immature 0 WALL 29 126 20 U Immature 0 WALL 30 122 17 U Immature 0 WALL 31 123 17 U Immature 0 WALL 32 121 18 U Immature 0 WALL 43 212 93 M Immature 1 WALL 44 252 161 F Immature 2 WALL 54 485 1,215 F Mature 9 WALL 55 221 105 M Immature 2 WALL 56 244 133 F Immature 2 WALL 62 418 750 M Mature 8 WALL 63 520 1,526 F Mature 10 WALL 70 398 578 F Immature 7 WALL 71 352 448 F Immature 5

Appendix 10. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) WALL 72 485 1,256 F Mature 9 WALL 73 417 703 F Mature 5 WALL 74 480 1,042 F Mature 9 WALL 80 465 1,059 F Mature 9 WALL 81 464 880 F Mature 9 WALL 82 513 1,434 F Mature 10 WALL 83 438 834 F Immature 8 WALL 95 314 306 F Immature 3 WALL 97 403 619 F Mature 7 WALL 98 446 868 F Mature 9 WALL 99 494 1,349 F Mature 9 WALL 100 451 926 F Mature 8 WALL 108 476 1,096 F Mature 9 WALL 125 274 196 M Immature 2 WALL 126 473 1,117 F Mature 9 WALL 131 451 1,045 F Mature 8 WALL 132 478 1,271 F Mature WALL 133 515 1,315 F Mature 9 WALL 134 394 648 M Mature 8 WALL 137 436 854 F Mature 8 WALL 138 450 1,037 F Mature 9 WALL 139 474 1,170 F Mature 9 WALL 140 463 945 M Mature 9 WALL 141 446 861 F Mature 9 WALL 142 427 718 F Mature 7 WALL 143 402 665 M Mature 9 WALL 144 390 636 M Mature 7 WALL 145 399 634 M Mature 9 WALL 150 460 1,001 F Mature 9 WALL 151 525 1,430 F Mature 11 WALL 152 480 1,140 F Mature 9

Appendix 10. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) WALL 156 114 13 U Immature 0 WALL 157 116 15 U Immature 0 WALL 166 425 735 F Mature 9 WALL 167 256 156 U Immature 2 WALL 172 328 340 F Immature 3 WALL 173 264 157 M Mature 2 WALL 174 387 507 F Immature 8 WALL 180 430 754 F Mature 9 WALL 181 434 866 F Mature 8 WALL 182 398 647 M Mature 9 WALL 189 336 360 F Immature WALL 190 331 384 M Mature 3 WALL 191 370 522 M Mature 5 WALL 192 381 541 M Mature 5 WALL 193 434 816 M Mature 8 WALL 194 444 864 M Mature 9 WALL 195 440 828 F Mature 9 WALL 196 415 743 M Mature 8 WALL 197 405 675 M Mature 5 WALL 199 462 1,005 F Mature 9 WALL 200 472 964 F Mature 9 WALL 201 468 1,148 F Mature 9 WALL 208 405 652 F Immature 7 WALL 211 437 803 F Mature 9 WALL 212 417 749 M Mature 8 WALL 222 391 576 F Mature 5 WALL 223 318 317 F Immature 3 WALL 241 251 159 F Immature 2 WALL 242 385 580 M Mature 8 WALL 248 360 432 F Immature 3 WALL 249 438 833 M Mature 9

Appendix 10. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) WALL 250 433 781 F Mature 8 WALL 251 434 779 M Mature 9 WALL 252 391 541 F Mature 9 WALL 253 433 767 F Mature 9 WALL 254 343 397 M Immature 3 WALL 255 393 595 M Mature 8 WALL 256 327 304 M Mature 3 WALL 257 372 488 F Mature 7 WALL 258 303 246 M Immature 2 WALL 261 358 450 M Mature 7 WALL 262 441 780 F Mature 9 WALL 263 452 818 F Mature 9 WALL 264 409 627 F Mature 8 WALL 265 395 631 M Mature 9 WALL 266 364 442 M Mature 7 WALL 267 404 677 M Mature 7 WALL 268 507 1,451 F Mature 9 WALL 269 370 510 M Mature 8 WALL 272 465 909 F Mature 9 WALL 279 424 733 M Mature 9 WALL 280 394 622 M Mature 8 WALL 281 410 699 M Mature 9 WALL 316 408 674 M Mature 9 WALL 329 400 605 F Mature 9 WALL 330 286 208 F Immature 2 WALL 338 473 998 F Mature 9 WALL 339 369 457 M Mature 8 WALL 340 297 242 F Immature 2 WALL 341 431 784 F Immature 8 WALL 342 463 980 F Mature 9 WALL 343 445 875 F Mature 9

Appendix 10. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) WALL 344 435 766 F Mature 8 WALL 345 388 594 M Mature 9 WALL 346 465 959 F Mature 9 WALL 347 470 1,001 F Mature 9 WALL 348 357 483 M Mature 7 WALL 349 405 708 F Mature 9 WALL 350 444 765 F Mature 8 WALL 351 430 801 M Mature 9 WALL 352 445 951 F Mature 9 WALL 353 399 596 F Mature 8 WALL 354 401 742 M Mature 9 WALL 355 458 913 F Mature 9 WALL 357 470 993 F Mature 9 WALL 358 484 1,023 F Mature 9 WALL 359 434 800 F Mature 8 WALL 369 404 597 M Mature 7 WALL 370 454 1,026 M Mature 9 WALL 374 383 609 M Mature 7 WALL 375 452 841 M Mature 9 WALL 376 405 731 M Mature 9 WALL 377 397 657 M Mature 7 WALL 378 405 645 F Mature 7 WALL 380 432 789 F Mature 9 WALL 384 425 787 M Mature 9 WALL 385 429 706 F Mature 9

Appendix 11. Biological data collected from non‐target fish species during the survey of Hilda Lake, Alberta, 2007. Abbreviations: CISC = cisco, NRPK = northern pike, WHSC = white sucker, YLPR = yellow perch, M = male, F = female, U = unidentified.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) CISC 3 103 9 U Immature CISC 6 184 70 F Immature CISC 9 231 165 F Mature CISC 14 248 226 M Mature CISC 15 304 387 F Mature CISC 16 300 374 F Mature CISC 17 300 382 F Mature CISC 18 280 316 F Mature CISC 23 291 340 F Mature CISC 24 302 392 F Mature CISC 59 235 167 F Immature CISC 60 248 224 F Mature CISC 61 300 431 F Mature CISC 64 239 175 F Mature CISC 65 234 161 M Mature CISC 66 235 166 F Mature CISC 67 297 403 F Mature CISC 68 284 327 F Mature CISC 69 293 374 F Mature CISC 75 296 399 F Mature CISC 76 272 299 F Mature CISC 77 300 392 M Mature CISC 78 301 466 F Mature CISC 79 306 418 M Mature CISC 129 181 76 M Immature CISC 130 193 99 F Immature CISC 176 189 87 M Immature CISC 177 194 88 M Immature CISC 178 230 164 F Immature

Appendix 11. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) CISC 179 245 198 M Mature CISC 186 242 180 M Mature CISC 187 242 180 M Mature CISC 188 240 202 M Mature CISC 206 245 195 F Mature CISC 207 240 214 F Mature CISC 210 247 211 M Immature CISC 245 248 208 M Immature CISC 246 233 177 M Mature CISC 247 197 91 F Immature CISC 259 292 344 M Mature CISC 260 255 214 F Mature CISC 273 315 450 M Mature NRPK 33 330 254 M Mature 2 NRPK 45 326 228 M Mature 2 NRPK 57 551 1,352 M Mature 6 NRPK 85 590 1,492 F Mature 6 NRPK 86 246 105 M Immature 1 NRPK 91 576 1,259 F Mature 6 NRPK 92 379 390 U Unknown 2 NRPK 93 401 440 F Mature 3 NRPK 94 484 820 F Mature 4 NRPK 96 589 1,404 F Mature 6 NRPK 101 651 1,974 F Mature 7 NRPK 102 560 1,103 F Mature 5 NRPK 103 534 1,026 M Mature 5 NRPK 104 531 1,020 F Mature 5 NRPK 105 530 1,214 M Mature 5 NRPK 106 595 1,586 F Mature 5 NRPK 116 522 1,035 F Mature 5 NRPK 127 325 227 F Immature 2

Appendix 11. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) NRPK 128 497 1,083 M Mature 5 NRPK 135 380 395 M Mature 3 NRPK 136 372 351 M Mature 3 NRPK 146 530 877 M Mature 5 NRPK 147 513 870 F Mature 4 NRPK 148 592 1,804 F Mature 5 NRPK 158 595 1,405 F Immature 5 NRPK 159 590 1,481 M Mature 6 NRPK 168 555 1,177 M Mature 5 NRPK 169 606 1,393 F Mature 5 NRPK 183 497 700 F Mature 4 NRPK 184 504 945 M Mature 5 NRPK 185 495 838 M Mature 4 NRPK 198 593 1,516 M Mature 6 NRPK 205 310 178 M Mature 1 NRPK 209 514 811 M Mature 5 NRPK 270 575 1,003 F Mature 6 NRPK 271 562 992 F Mature 5 NRPK 282 603 1,556 F Mature 5 NRPK 317 641 1,668 F Mature 6 NRPK 331 625 1,690 F Mature 5 NRPK 332 684 2,577 F Mature 6 NRPK 333 578 1,191 F Mature 5 NRPK 365 407 474 F Mature 3 NRPK 366 560 1,235 F Mature 5 NRPK 371 490 745 M Mature 4 NRPK 372 516 1,027 M Mature 4 NRPK 379 569 1,269 F Mature 4 NRPK 381 503 806 M Mature 5 NRPK 382 890 5,600 F Mature 9 WHSC 107 340 581 U Unknown

Appendix 11. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) WHSC 109 415 1,102 U Unknown WHSC 149 415 1,103 U Unknown WHSC 153 468 1,477 U Unknown WHSC 154 425 1,201 U Unknown WHSC 155 412 1,087 U Unknown WHSC 274 441 1,214 U Unknown WHSC 275 445 1,044 U Unknown WHSC 276 410 1,046 U Unknown WHSC 277 438 1,265 U Unknown WHSC 278 427 1,396 U Unknown WHSC 356 398 1,006 U Unknown WHSC 360 405 1,215 U Unknown WHSC 361 472 1,658 U Unknown WHSC 383 372 768 U Unknown WHSC 386 445 1,402 U Unknown WHSC 387 454 1,474 U Unknown YLPR 2 102 10 F Immature YLPR 5 138 34 M Mature YLPR 34 91 8 M Immature YLPR 35 94 11 F Mature YLPR 36 99 13 F Immature YLPR 37 106 14 M Immature YLPR 38 104 15 F Immature YLPR 39 103 12 M Mature YLPR 40 104 13 M Mature YLPR 41 106 14 F Immature YLPR 42 108 22 M Mature YLPR 46 136 28 M Mature YLPR 47 135 37 F Mature YLPR 48 131 27 M Immature YLPR 49 134 34 M Mature

Appendix 11. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) YLPR 50 138 35 F Mature YLPR 51 145 42 M Mature YLPR 52 141 38 M Mature YLPR 53 170 60 F Mature YLPR 58 176 68 F Immature YLPR 84 99 12 F Immature YLPR 87 137 36 F Immature YLPR 88 137 31 F Immature YLPR 89 149 36 F Immature YLPR 90 152 45 F Immature YLPR 110 90 9 M Immature YLPR 111 101 12 M Immature YLPR 112 97 13 F Immature YLPR 113 90 7 M Immature YLPR 114 99 12 M Mature YLPR 115 94 8 M Immature YLPR 117 150 44 M Immature YLPR 118 145 36 M Immature YLPR 119 159 47 M Mature YLPR 120 145 36 F Immature YLPR 121 143 40 M Immature YLPR 122 143 36 F Immature YLPR 123 138 34 F Immature YLPR 124 158 47 F Immature YLPR 160 95 11 F Immature YLPR 161 104 15 M Immature YLPR 162 112 17 M Mature YLPR 163 88 7 F Immature YLPR 164 103 12 F Immature YLPR 165 102 13 U Immature YLPR 170 132 29 F Immature

Appendix 11. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) YLPR 171 147 36 M Immature YLPR 175 178 75 M Mature YLPR 202 145 33 M Mature YLPR 203 140 32 F Immature YLPR 204 150 45 M Mature YLPR 213 98 10 F Immature YLPR 214 95 10 F Immature YLPR 215 89 8 F Immature YLPR 216 99 11 F Immature YLPR 217 115 17 M Mature YLPR 218 97 11 M Mature YLPR 219 104 13 M Immature YLPR 220 116 20 M Immature YLPR 221 136 31 M Immature YLPR 224 156 F Mature YLPR 225 141 31 M Mature YLPR 226 144 33 M Mature YLPR 227 161 60 F Mature YLPR 228 178 64 M Mature YLPR 229 171 65 M Mature YLPR 230 228 152 F Mature YLPR 231 134 27 M Mature YLPR 232 136 32 M Mature YLPR 233 139 34 F Immature YLPR 234 128 27 M Mature YLPR 235 143 37 M Mature YLPR 236 130 29 M Mature YLPR 237 137 32 F Immature YLPR 238 137 35 F Immature YLPR 239 137 34 M Mature YLPR 240 156 51 M Mature

Appendix 11. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) YLPR 243 177 74 M Mature YLPR 244 192 91 M Mature YLPR 283 105 15 F Immature YLPR 284 103 16 M Mature YLPR 285 105 13 F Immature YLPR 286 97 11 F Immature YLPR 287 103 13 M Immature YLPR 288 101 12 F Immature YLPR 289 103 13 M Immature YLPR 290 106 16 F Immature YLPR 291 100 11 M Immature YLPR 292 129 27 M Mature YLPR 293 110 16 M Mature YLPR 294 105 13 F Immature YLPR 295 123 21 F Immature YLPR 296 174 69 M Mature YLPR 297 109 17 F Immature YLPR 298 95 10 M Mature YLPR 299 99 11 F Immature YLPR 300 102 13 M Immature YLPR 301 100 12 M Immature YLPR 302 105 14 M Immature YLPR 303 97 11 F Immature YLPR 304 97 10 M Immature YLPR 305 99 11 M Immature YLPR 306 93 9 M Immature YLPR 307 94 10 M Immature YLPR 308 103 13 M Immature YLPR 309 99 11 M Immature YLPR 310 98 11 M Immature YLPR 311 97 11 M Immature

Appendix 11. Continued.

Sample Fork length Weight Age Species # (mm) (g) Sex Maturity (y) YLPR 312 95 9 M Mature YLPR 313 97 10 M Immature YLPR 314 105 12 M Mature YLPR 315 97 11 M Immature YLPR 318 131 27 M Mature YLPR 319 134 30 M Mature YLPR 320 145 36 M Immature YLPR 321 137 32 F Immature YLPR 322 162 56 M Mature YLPR 323 139 34 M Mature YLPR 324 170 61 F Immature YLPR 325 174 73 F Immature YLPR 326 179 78 M Mature YLPR 327 131 29 M Mature YLPR 328 164 64 M Mature YLPR 334 167 64 M Mature YLPR 335 209 121 F Immature YLPR 336 179 78 M Mature YLPR 337 172 68 M Mature YLPR 362 99 11 M Immature YLPR 363 94 9 U Immature YLPR 364 114 18 M Immature YLPR 367 157 56 M Mature YLPR 368 155 53 F Immature YLPR 373 206 115 M Mature

Appendix. 12. Standardized probability density function of walleye catch rate from Hilda Lake, Alberta, 2007. Mean = 15.1 walleye/100 m2/24 h, 95% CI = 10.1 – 19.9, n = 9.

. 1.0 density

0.8

0.6 probability

0.4

0.2

0.0 Standardized 0 5 10 15 20 25 30

Catch rate (walleye/100 m2/24 h)

64 CCONSERVATIONONSERVATION RREPORTEPORT SSERIESERIES The Alberta Conservation Association acknowledges the following partner for their generous support of this project