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Fish Assemblage in Southern Alberta Reservoirs, 2003

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Fish Assemblage in Southern Alberta Reservoirs, 2003 Fish Assemblage in Southern Alberta Reservoirs, 2003 CONSERVATION REPORT SERIES The Alberta Conservation Association is a Delegated Administrative Organization under Alberta’s Wildlife Act. CONSERVATION REPORT SERIES 25% Post Consumer Fibre When separated, both the binding and paper in this document are recyclable Fish Assemblage in Southern Alberta Reservoirs, 2003 Jason A. Cooper Alberta Conservation Association 2nd Floor, YPM Place 530‐8 Street South Lethbridge, Alberta, Canada T1J 2J8 Report Series Co‐editors PETER AKU KELLEY KISSNER Alberta Conservation Association 50 Tuscany Meadows Cres. NW #101, 9 Chippewa Rd Calgary, Alberta T3L 2T9 Sherwood Park, AB T8A 6J7 Conservation Report Series Type Data, Technical ISBN printed: 978‐0‐7785‐8183‐3 ISBN online: 978‐0‐7785‐8184‐0 Publication No.: T/207 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: Cooper, J.A. 2005. Fish assemblage in southern Alberta reservoirs, 2003. Data Report, D‐2005‐037, produced by the Alberta Conservation Association, Lethbridge, Alberta, Canada. 62 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) 410‐1998 Fax: (780) 464‐0990 Email: info@ab‐conservation.com Website: www.ab‐conservation.com i EXECUTIVE SUMMARY In an effort to determine fish community structure, the Alberta Conservation Association (ACA) sampled nine irrigation reservoirs in southern Alberta between 26 May and 22 August 2003. The study included the following reservoirs: Crawling Valley, Fincastle, Forty Mile Coulee, Keho, Lake McGregor, Lake Newell, Little Bow, Milk River Ridge and Rattlesnake/Sauder. Fourteen fish species comprising seven families were caught by beach seine (91%) and gill net (9%). Among sport fish, walleye, northern pike, and lake whitefish occurred in all reservoirs. Yellow perch was sampled in all reservoirs except Milk River Ridge and Keho reservoirs, where the species does not occur. Yellow perch was the most abundant sport fish, constituting 30% and 75% of the beach seine and gill net catches, respectively. Walleye comprised less than 1% and 5% of the beach seine and gill net catches, respectively. Although adult walleye were captured from all reservoirs, young‐of‐the‐year (yoy; n = 221) were captured in seven of the nine reservoirs only; the exceptions were Fincastle and Little Bow reservoirs. Crawling Valley Reservoir had the highest catch of yoy walleye (n = 127). Overall, spottail shiner, a non‐sport fish species, was the most abundant species captured (n = 46,318), and lake chub, longnose dace, and burbot were the least abundant species (n = 1 for each species). Overall, gill net catch‐per‐unit‐effort (CPUE) for walleye ranged from 1.2 fish/91.4 m/24 h in Fincastle Reservoir to 50.2 fish/91.4 m/24 h in Crawling Valley Reservoir. CPUE for northern pike ranged from 1.7 fish/91.4 m/24 h in Milk River Ridge Reservoir to 14.4 fish/91.4 m/24 h in Forty Mile Coulee Reservoir. Yellow perch had the highest CPUE, ranging from 0.0 fish/91.4 m/24 h in Crawling Valley Reservoir to 829.3 fish/91.4 m /24 h in Fincastle Reservoir. CPUE for lake whitefish ranged from 134.5 fish/91.4 m/24 h in Milk River Ridge Reservoir to 2.9 fish/91.4 m/24 h in Fincastle Reservoir. No burbot were captured in gill nets in any of the reservoirs; however, this species is known to exist in all reservoirs. Overall, beach seine CPUE for walleye ranged from 0.0 fish/100 m2 in Little Bow and Fincastle reservoirs to 0.7 fish/100 m2 in Crawling Valley Reservoir. CPUE for northern pike ranged from 0.0 fish/100 m2 in Keho Lake to 0.2 fish/100 m2 in Crawling Valley ii Reservoir. Again, yellow perch had the highest CPUE, ranging from 0.5 fish/100 m2 in Crawling Valley Reservoir to 98.5 fish/100 m2 in Lake Newell. CPUE for lake whitefish ranged from 0.0 fish/100 m2 in Crawling Valley, Fincastle, Forty Mile Coulee and Rattlesnake/Sauder reservoirs to 35.4 fish/100 m2 in Lake Newell. Only one burbot was captured by beach seine in Rattlesnake/Sauder Reservoir even though this species is known to exist in all reservoirs. The dominant year‐class of walleye shifted from the stocked 1991 cohort to the naturally‐recruited 1998 cohort, especially in Keho Lake, Forty Mile Coulee, Lake McGregor, and Rattlesnake/Sauder reservoirs. Growth rate for walleye was highest in Keho Lake, and lowest in Milk River Ridge Reservoir. In general, average age‐at‐first‐ maturity for walleye was 5 y for both males (range = 4 – 6 y) and females (range = 4 ‐ 7 y). The Rattlesnake/Sauder Reservoir population had the earliest age‐at‐first‐maturity for male walleye (4 y) and Forty Mile Coulee and Milk River Ridge reservoirs had the most delayed age‐at‐first‐maturity (6 y) for males. Similarly, Lake Newell walleye had the earliest age‐at‐first‐maturity for female walleye (4 y), whereas Milk River Ridge Reservoir had the most delayed (7 y). Overall, walleye recruitment between 1996 and 2003 in the nine surveyed reservoirs has been variable. Mean beach seine CPUEs for yoy walleye ranged from 0.0 fish/100 m2 in Fincastle and Little Bow reservoirs to 1.06 fish/100 m2 in Crawling Valley Reservoir. Crawling Valley Reservoir exhibited the highest natural walleye recruitment over the eight‐year period (1996 ‐ 2003). The data collected over the last eight years suggests that natural walleye recruitment is occurring in seven of the nine reservoirs surveyed in 2003; the exceptions are Fincastle and Little Bow reservoirs. iii ACKNOWLEDGEMENTS This study was funded by the Alberta Conservation Association. Thanks to Jason Blackburn for assisting with field data collection. Thanks to John Hall for helping with the preparation of aging structures and with aging of sport fish. Thanks also to members of Walleye Unlimited who collected walleye from Crawling Valley Reservoir during the test‐angling fishery. This report benefited from constructive comments by Terry Clayton, Trevor Council, PAKU Consulting Services and an anonymous reviewer. Brad Hurkett was actively involved in the final preparation of this report. iv TABLE OF CONTENTS EXECUTIVE SUMMARY...........................................................................................................ii ACKNOWLEDGEMENTS........................................................................................................iv TABLE OF CONTENTS .............................................................................................................v LIST OF FIGURES......................................................................................................................vi LIST OF TABLES..................................................................................................................... viii LIST OF APPENDICES .............................................................................................................xi 1.0 INTRODUCTION ..........................................................................................................1 2.0 STUDY AREA.................................................................................................................3 2.1 Descriptions of individual reservoirs..........................................................................3 2.2 Limnological characteristics of reservoirs ..................................................................7 2.3 Walleye stocking ............................................................................................................7 3.0 MATERIALS AND METHODS ...................................................................................9 3.1 General sampling methods...........................................................................................9 3.2 Biological fish data.......................................................................................................10 3.3 Data analysis.................................................................................................................11 4.0 RESULTS .......................................................................................................................11 4.1 Gill net catch .................................................................................................................11 4.2 Beach seine catch..........................................................................................................16 4.3 Walleye recruitment ....................................................................................................18 4.4 Walleye growth rate ....................................................................................................21 4.5 Age‐at‐first‐maturity of walleye ................................................................................22 4.6 Individual reservoir results ........................................................................................23 5.0 LITERATURE CITED ..................................................................................................59 6.0 APPENDIX....................................................................................................................63
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