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Evaluation of the Thermal Habitat Volume for Lake Trout in Selected Lakes of Southwest Alaska, 1994

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Evaluation of the Thermal Habitat Volume for Lake Trout in Selected Lakes of Southwest Alaska, 1994 Fishery Data Series No. 95-26 Evaluation of the Thermal Habitat Volume for Lake Trout in Selected Lakes of Southwest Alaska, 1994 by Daniel Bosch, Lewis Coggins, and R. Eric Minard November 1995 Alaska Department of Fish and Game Division of Sport Fish FISHERY DATA SERIES NO. 95-26 EVALUATION OF THE THERMAL HABITAT VOLUME FOR LAKE TROUT IN SELECTED LAKES OF SOUTHWEST ALASKA, 1994 Daniel Bosch, Division of Sport Fish, Anchorage Lewis Coggins and R. Eric Minard Division of Sport Fish, Dillingham Alaska Department of Fish and Game Division of Sport Fish, Research and Technical Services 333 Raspberry Road, Anchorage, Alaska, 995 18- 1599 November 1995 This investigation was partially financed by the Federal Aid in Sport Fish Restoration Act c(16 1J.S.C. 777-777K) under project F-10-10, Job No. R-2-9. The Fishery Data Series was established in 1987 for the publication of technically-oriented results for a single project or group of closely related projects. Fishery Data Series reports are intended for fishery and other technical professionals. Distribution is to state and local publication distribution centers, libraries and individuals and, on request, to other libraries, agencies, and individuals. This publication has undergone editorial and peer review. Daniel Bosch, Alaska Department of Fish and Game, Division of Sport Fish, 333 Raspberry Road, Anchorage, AK 99518-1599, USA, Lewis Coggins and R. Eric Minard, Alaska Department of Fish and Game, Division of Sport Fish P.O. Box 230, Dillingham, AK 99737-0605, USA This document should be cited as: Bosch, Daniel, Lewis Coggins, and R. Eric Minard. 1995. Evaluation of the thermal habitat volume for lake troui in selected lakes of Southwest Alaska, 1994. Alaska Department of Fish and Game, Fishery Data SerieJ No. 95-26, Anchorage. The Alaska Department of Fish and Game administers all programs and activities free from discrimination on the basis of sex, color, race, religion, national origin, age, marital status, pregnancy, parenthood, or disability. For inforniation on alternative formats available for this and other department publications, contact the department ADA Coordinator at (voice) 907-465-4120, or (TDD) 907-465-3646. Any person who believes s/he has been discriminated against should write to: ADF&G, PO Box 25526, Juneau, AK 99802-5526; or O.E.O., U.S. Department of the Interior, Washington, DC 20240. TABLE OF CONTENTS Page LIST OF TABLES ........................................................................................................................................................ ii LIST OF FIGURES ....................................................................................................................................................... ii LIST OF APPENDICES ............................................................................................................................................... ii ABSTRACT .................................................................................................................................................................. 1 INTRODUCTION ......................................................................................................................................................... 1 METHODS ..... ................................................................................... 2 Site Descriptions ......................................................................................................................................... Estimation of Thermal Habitat Volume .... ....................................................................... Bathymetric Data Collection .................................................................................. Temperature Data Collection .................................................................................................................. Thermal Habitat Volume ................. .................................................................................................................... 5 Biological Information .............................................................................................................................. Potential Harvest and Sustained Yield ...................................................................................................... Actual Harvest Weight ... ............................................ ................................................................... 6 RESULTS ..................................................................................................................................................................... 6 Weight and Length Information ............. ............................................................... 6 Thermal Habitat Vol Current Harvest ....... BRISJ'OL BAY LAKE TROUT STUDY (THV) RECOMMENDATIONS .............................................................. 1 1 ACKNOWLEDGMENTS ........................................................................................................................................... 1 1 LITERATURE CITED ............................................................................................................................................... 1 1 APPENDIX A. BATHYMETRIC MAPS OF STUDY LAKES ................................................................................ 15 APPENDIX B. BIOLOGICAL DATA FROM LAKES WHERE SAMPLE SIZE GOALS WERE NOT MET ...... 3 1 APPENDIX C. THERMAL HABITAT VOLUME AND YIELD ESTIMATES ...................................................... 35 i LIST OF TABLES Table Page 1. Study lakes and USGS quadrangles were they are located. ............................................. 3 2. Dates of temperature and bathymetric sampling of the 14 study lakes in 1994............................................... 4 3. Biological information collected during 1994, from lakes where adequate sample sizes were collected. ......7 4. Minimum thermal habitat volumes (THV) and potential harvest and sustained yield for lake trout from Southwest Alaska study lakes, 1994. ............................................................................................... ...... 8 5 Average number of respondents (households) to the Statewide Harvest Survey who reported fishing at the study lakes during 1984-1993, and average estimated harvest of lake trout from the Statewide Harvest Survey during that period. ................................................................................................................. 9 LIST OF FIGURES Figure Page 1. Historical harvest of lake trout from the Southwestern Alaska Sport Fish Management Area ........................ 1 2. Locations of parks and refuges containing study lakes. .................................................................................. 3 LIST OF APPENDICES Appendix Page Al. Bathymetric map of Brooks Lake .................................................................. 16 A2. Bathymetric map of Lake Clark. ....... ...................................................... 17 A3. Bathymetric map of Goodnews Lake ......................................................................................... I8 A4. Bathymetric map of Heart Lake. .................................................................................................. 19 A5. Bathymetric map of Kagati Lake. ................................................................................................................. 20 A6. Bathymetric map of Kanuktik Lake. ........................................... .......................................... 21 A7. Bathymetric map of Kontrashibuna Lake ...................................................................................................... 22 A8. Bathymetric map of Naknek Lake, excluding Iliuk Arm ............................................................................... 23 A9. Bathymetric map of the Iliuk Arm of Naknek Lake. ..................................................................................... 24 AlO. Bathymetric map of Telaquana Lake. ...................................................................................................... 25 All. Bathymetric map of Tikchik Lake ...... A12. Bathymetric map of Turquoise Lake.. A13. Bathymetric map of Lower Twin Lake. ........................................................................... A14. Bathymetric map of Upper Twin Lake .... A15. Bathymetric map of Lower Ugashik L B1. Mean lengths (mm) and weights (8) o from lakes where sample size goals were not met ......................................................................................... 32 B2. Historical biological information from the sport harvest at Goodnews Lake and Goodnews River, collected during 1975.............................................................................. CI. Thermal habitat volume (THV) and sustained yield estimates using tem the first temperature sampling event. ............................................................................... c2. Thermal habitat volume (THV) and sustained yield estimates using temperature profile during the second sampling event. .......................................................... .. 11 ABSTRACT This was the first year of a multiyear study to evaluate thermal habitat volume and sustained yield for lake trout Salvelinus nurnaycush in 14 lakes in Southwest Alaska (Brooks, Naknek, Lower Ugashik, Tikchik, Kontrashibuna, Lower Twin, Upper Twin, Turquoise, Telaquana, Goodnews, Heart, Kagati, and Kanuktik lakes, and Lake Clark). During
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