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Status of Walleye Populations at Bourque, Goodfish, and Seibert Lakes, Alberta, 2006

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Status of Walleye Populations at Bourque, Goodfish, and Seibert Lakes, Alberta, 2006 Status of Walleye Populations at Bourque, Goodfish, and Seibert Lakes, Alberta, 2006 CONSERVATION REPORT SERIES The Alberta Conservation Association is a Delegated Administrative Organization under Alberta’s Wildlife Act. CCONSERVATIONONSERVATION RREPORTEPORT SSERIESERIES 25% Post Consumer Fibre When separated, both the binding and paper in this document are recyclable Status of Walleye Populations at Bourque, Goodfish, and Seibert Lakes, Alberta, 2006 Brendan Ganton and Bill Patterson Alberta Conservation Association #101, 9 Chippewa Rd Sherwood Park AB T8A 6J7 Report Series Editor PETER AKU KELLEY J. KISSNER Alberta Conservation Association 59 Hidden Green NW #101, 9 Chippewa Rd Calgary, AB T3A 5K6 Sherwood Park, AB T8A 6J7 Conservation Report Series Type Data, Technical ISBN printed: 978‐0‐7785‐6571‐0 ISBN online: 978‐0‐7785‐6572‐7 Publication No.: T/164 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., and B. Patterson. 2007. Status of walleye populations at Bourque, Goodfish, and Seibert Lakes, Alberta, 2006. Data report, D‐2007‐009, produced by the Alberta Conservation Association, Sherwood Park, Alberta, Canada. 23 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 In an effort to contribute to effective management of walleye stocks in Alberta, the Alberta Conservation Association (ACA) conducted gill netting surveys on Bourque, Goodfish and Seibert lakes from 19 September to 4 October 2006 using the Fall Walleye Index Netting (FWIN) protocol. FWIN provides an estimate of both stock abundance and population structure and is used by Alberta Sustainable Resource Development as a tool to sustainably manage the sport fishery. Data from Bourque Lake suggest that in 2006 the walleye population had a broad and stable age‐class distribution, though the catch rate of each year class was low (< 2 walleye/100 m2/24 h). The mean age of walleye sampled was 4.9 years. The fishery was composed of moderately fast‐growing and early‐maturing fish. The catch rate of walleye was 9.3 walleye/100 m2/24 h. Data from Goodfish Lake suggest that in 2006 the walleye population had a narrow and unstable age‐class distribution. The mean age of walleye sampled was 5.2 years, and the fishery was composed of slow‐growing, moderately early‐maturing fish. The catch rate of walleye was 14.6 walleye/100 m2/24 h. Data from Seibert Lake suggest that in 2006 the walleye population had a broad age‐ class distribution, primarily supported by three strong age classes. The mean age of walleye sampled was 5.7 years, and the fishery was composed of slow‐growing, early‐ maturing fish. The catch rate of walleye was 14.8 walleye/100 m2 /24 h. ii ACKNOWLEDGEMENTS Financial support for this study was provided by the Alberta Conservation Association. Alberta Sustainable Resource Development provided in‐kind support, campground and sampling facilities. We thank Steven Hamilton (ACA) for providing mapping support. 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 1.1 Bourque Lake..................................................................................................................1 1.2 Goodfish Lake.................................................................................................................1 1.3 Seibert Lake.....................................................................................................................2 2.0 STUDY AREAS...............................................................................................................2 2.1 Bourque Lake..................................................................................................................2 2.2 Goodfish Lake.................................................................................................................2 2.3 Seibert Lake.....................................................................................................................3 3.0 MATERIALS AND METHODS ...................................................................................7 4.0 RESULTS ......................................................................................................................10 4.1 Capture data .................................................................................................................10 4.2 Walleye population structure.....................................................................................12 4.3 Stock assessment summaries......................................................................................21 5.0 LITERATURE CITED ..................................................................................................22 6.0 APPENDICES...............................................................................................................24 iv LIST OF FIGURES Figure 1. Map of Bourque Lake, Alberta ............................................................................ 4 Figure 2. Map of Goodfish Lake, Alberta........................................................................... 5 Figure 3. Map of Seibert Lake, Alberta. .............................................................................. 6 Figure 4. Standardized probability density function of walleye catch rate as sampled from Bourque Lake, Alberta in 2006................................................................. 10 Figure 5. Standardized probability density function of walleye catch as sampled from Goodfish Lake, Alberta in 2006................................................................ 11 Figure 6. Standardized probability density function of walleye catch rate as sampled from Seibert Lake, Alberta in 2006.................................................................... 12 Figure 7. Age‐class distribution of walleye sampled from Bourque Lake, Alberta in 2006........................................................................................................................ 13 Figure 8. Length‐at‐age relationship for walleye sampled from Bourque Lake, Alberta in 2006..................................................................................................... 13 Figure 9. Age‐at‐maturity of male walleye sampled from Bourque Lake, Alberta in 2006........................................................................................................................ 14 Figure 10. Age‐at‐maturity of female walleye sampled from Bourque Lake, Alberta in 2006........................................................................................................................ 14 Figure 11. Age‐class distribution of walleye sampled from Goodfish Lake, Alberta in 2006........................................................................................................................ 15 Figure 12. Length‐at‐age relationship for walleye sampled from Goodfish Lake, Alberta in 2006..................................................................................................... 16 Figure 13. Age‐at‐maturity of male walleye sampled from Goodfish Lake, Alberta in 2006........................................................................................................................ 17 Figure 14. Age‐at‐maturity of female walleye sampled from Goodfish Lake, Alberta in 2006........................................................................................................................ 17 Figure 15. Age‐class distribution of walleye sampled from Seibert Lake, Alberta in 2006........................................................................................................................ 18 Figure 16. Length‐at‐age relationship for walleye sampled from Seibert Lake, Alberta in 2006 ................................................................................................................... 19 Figure 17. Age‐at‐maturity of male walleye sampled from Seibert Lake, Alberta in 2006........................................................................................................................ 20 Figure 18. Age‐at‐maturity of female walleye sampled from Seibert Lake, Alberta in 2006.......................................................................................................................
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