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  • LAKE PEND OREILLE RESEARCH, 2009

    LAKE PEND OREILLE FISHERY RECOVERY PROJECT

    ANNUAL PROGRESS REPORT

    March 1, 2009—February 28, 2010

    Prepared by:

    Nicholas C. Wahl, Senior Fishery Research Biologist Andrew M. Dux, Principal Fishery Research Biologist

    William J. Ament, Senior Fishery Technician and

    William Harryman, Senior Fishery Technician

    IDFG Report Number 11-08 April 2011

  • LAKE PEND OREILLE RESEARCH, 2009

    LAKE PEND OREILLE FISHERY RECOVERY PROJECT

    Annual Progress Report

    March 1, 2009—February 28, 2010

    By

    Nicholas C. Wahl Andrew M. Dux

    William J. Ament and

    William Harryman

    Idaho Department of Fish and Game 600 South Walnut Street

    P.O. Box 25 Boise, ID 83707

    To

    U.S. Department of Energy Bonneville Power Administration

    Division of Fish and Wildlife P.O. Box 3621

    Portland, OR 97283-3621

    Project Number 1994-047-00 Contract Number 41509

    IDFG Report Number 11-08 April 2011

  • i

    TABLE OF CONTENTS Page

    LAKE PEND OREILLE FISHERY RECOVERY BACKGROUND................................................. 1 INTRODUCTION ........................................................................................................................ 1 STUDY AREA ............................................................................................................................. 1 PROJECT OBJECTIVES ............................................................................................................ 2 CHAPTER 1: KOKANEE RESEARCH ........................................................................................ 4 ABSTRACT ................................................................................................................................. 4 INTRODUCTION ........................................................................................................................ 5 METHODS .................................................................................................................................. 5

    Kokanee Abundance and Survival ........................................................................................... 5 Hatchery and Wild Kokanee Abundance ............................................................................... 6 Kokanee Egg to Fry Survival ................................................................................................. 7 Historical Trawling Comparisons ........................................................................................... 7

    Kokanee Biomass, Production, and Mortality by Weight .......................................................... 7 Kokanee Spawner Counts........................................................................................................ 8 Kokanee Spawning Habitat ...................................................................................................... 8 Mysis Shrimp Abundance ........................................................................................................ 9

    RESULTS ................................................................................................................................... 9 Kokanee Abundance and Survival ........................................................................................... 9

    Hatchery and Wild Abundance ............................................................................................ 10 Kokanee Egg to Fry Survival ............................................................................................... 10 Historical Trawling Comparisons ......................................................................................... 10

    Kokanee Biomass, Production, and Mortality by Weight ........................................................ 11 Kokanee Spawner Counts...................................................................................................... 11 Kokanee Spawning Habitat .................................................................................................... 11 Mysis Shrimp Abundance ...................................................................................................... 11

    DISCUSSION............................................................................................................................ 11 Kokanee Population Dynamics .............................................................................................. 11 Gravel Sampling .................................................................................................................... 13 Mysis Shrimp Abundance ...................................................................................................... 13

    RECOMMENDATIONS ............................................................................................................. 14 CHAPTER 2: LAKE TROUT RESEARCH EFFORTS................................................................ 28 ABSTRACT ............................................................................................................................... 28 INTRODUCTION ...................................................................................................................... 29 METHODS ................................................................................................................................ 29

    Lake Trout Telemetry ............................................................................................................. 29 Mature Lake Trout ............................................................................................................... 29 Subadult and Juvenile Lake Trout ....................................................................................... 30

    Lake Trout Spawning Assessment ......................................................................................... 30 Lake Trout Population Characteristics .................................................................................... 30 Lake Trout Removal ............................................................................................................... 31

    RESULTS ................................................................................................................................. 31 Lake Trout Telemetry ............................................................................................................. 31

    Mature Lake Trout ............................................................................................................... 31

  • ii

    Table of Contents, continued. Page

    Subadult and Juvenile Lake Trout ....................................................................................... 32

    Lake Trout Spawning Assessment ......................................................................................... 33 Lake Trout Population Characteristics .................................................................................... 34 Lake Trout Removal ............................................................................................................... 34

    DISCUSSION............................................................................................................................ 35 Lake Trout Telemetry ............................................................................................................. 35

    Mature Lake Trout ............................................................................................................... 35 Subadult and Juvenile Lake Trout ....................................................................................... 35

    Lake Trout Spawning Assessment ......................................................................................... 36 Lake Trout Population Characteristics .................................................................................... 37 Lake Trout Removal ............................................................................................................... 37

    RECOMMENDATIONS ............................................................................................................. 38 CHAPTER 3: RAINBOW TROUT RESEARCH ......................................................................... 52 ABSTRACT ............................................................................................................................... 52 INTRODUCTION ...................................................................................................................... 53 METHODS ................................................................................................................................ 53 RESULTS ................................................................................................................................. 53 RECOMMENDATIONS ............................................................................................................. 54 ACKNOWLEDGMENTS ............................................................................................................ 55 LITERATURE CITED ................................................................................................................ 56 APPENDICES ........................................................................................................................... 62

  • iii

    LIST OF TABLES Page

    Table 1. Population estimates of kokanee fry (millions) based on hydroacoustic

    surv