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Development of a System-Wide Predator Control Program

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Development of a System-Wide Predator Control Program DEVELOPMENT OF A SYSTEM-WIDE PREDATOR CONTROL PROGRAM: STEPWISE IMPLEMENTATION OF A PREDATION INDEX, PREDATOR CONTROL FISHERIES, AND EVALUATION PLAN IN THE COLUMBIA RIVER BASIN 2003 ANNUAL REPORT Prepared by: Russell Porter Pacific States Marine Fisheries Commission In Cooperation with: Oregon Department of Fish and Wildlife Washington Department of Fish and Wildlife Prepared for: U.S. Department of Energy Bonneville Power Administration Environment, Fish and Wildlife P.O. Box 3621 Portland, OR 97208-3621 Project Number 199007700 Contract Number 00004477 TABLE OF CONTENTS 2002 EXECUTIVE SUMMARY ...................................................................................... 3 REPORT A....................................................................................................................................... IMPLEMENTATION OF THE NORTHERN PIKEMINNOW SPORT-REWARD FISHERY IN THE COLUMBIA AND SNAKE RIVERS................................................................. 8 ACKNOWLEDGMENTS ........................................................................................................... 9 ABSTRACT............................................................................................................................... 10 INTRODUCTION ..................................................................................................................... 11 METHODS OF OPERATION .................................................................................................. 12 Fishery Operation....................................................................................................................... 12 Boundaries and Season 12 Registration Stations 13 Reward System 13 Angler Sampling 14 Returning Anglers 15 Non-Returning Anglers 15 Northern Pikeminnow Handling Procedures ............................................................................. 15 Biological Sampling 15 PIT Tag Detection 15 Northern Pikeminnow Processing 16 RESULTS AND DISCUSSION................................................................................................ 16 Northern Pikeminnow Harvest 16 Incidental Catch/harvest by Species .......................................................................................... 20 Returning Anglers 20 Non-Returning Anglers 21 Angler Effort 23 Catch Per Angler Day 26 Angler Totals 29 Tag Recovery 31 SUMMARY............................................................................................................................... 34 RECOMMENDATIONS FOR THE 2004 SEASON................................................................ 35 REFERENCES .......................................................................................................................... 36 APPENDIX A Northern pikeminnow sport-reward fishery rules and regulations……………39 APPENDIX B Species Codes................................................................................................... 41 REPORT B ....................................................................................................................................... NORTHERN PIKEMINNOW SPORT REWARD PAYMENTS – 2003 ........................ 43 CATCH AND PAYMENTS...................................................................................................... 43 TAGGED FISH PAYMENTS................................................................................................... 43 i ACCOUNTING ......................................................................................................................... 43 2003 SPORT REWARD PAYMENTS SUMMARY................................................................ 44 REPORT C....................................................................................................................................... DEVELOPMENT OF A SYSTEM-WIDE PREDATOR CONTROL PROGRAM: FISHERIES EVALUATION.................................................................................................................. 46 ABSTRACT............................................................................................................................... 46 INTRODUCTION ..................................................................................................................... 48 METHODS ................................................................................................................................ 48 Fishery Evaluation, Predation Estimates, and Tag Loss............................................................ 48 Field Procedures 48 Data Analysis 49 Age Validation 51 RESULTS .................................................................................................................................. 53 Fishery Evaluation, Predation Estimates, and Tag Loss & Mortality 53 Age Validation........................................................................................................................... 58 DISCUSSION............................................................................................................................ 64 ACKNOWLEDGMENTS ......................................................................................................... 67 REFERENCES .......................................................................................................................... 68 APPENDIX A Exploitation of Northern Pikeminnow, 1998-2002.......................................... 70 APPENDIX B Dates of sampling in 2003........................................................................ 77 ii 2003 EXECUTIVE SUMMARY by Russell G. Porter This report presents results for year thirteen in a basin-wide program to harvest northern pikeminnow1 (Ptychocheilus oregonensis). This program was started in an effort to reduce predation by northern pikeminnow on juvenile salmonids during their emigration from natal streams to the ocean. Earlier work in the Columbia River Basin suggested predation by northern pikeminnow on juvenile salmonids might account for most of the 10-20% mortality juvenile salmonids experience in each of eight Columbia River and Snake River reservoirs. Modeling simulations based on work in John Day Reservoir from 1982 through 1988 indicated that, if predator-size northern pikeminnow were exploited at a 10-20% rate, the resulting restructuring of their population could reduce their predation on juvenile salmonids by 50%. To test this hypothesis, we implemented a sport-reward angling fishery and a commercial longline fishery in the John Day Pool in 1990. We also conducted an angling fishery in areas inaccessible to the public at four dams on the mainstem Columbia River and at Ice Harbor Dam on the Snake River. Based on the success of these limited efforts, we implemented three test fisheries on a system-wide scale in 1991—a tribal longline fishery above Bonneville Dam, a sport-reward fishery, and a dam-angling fishery. Low catch of target fish and high cost of implementation resulted in discontinuation of the tribal longline fishery. However, the sport-reward and dam-angling fisheries were continued in 1992 and 1993. In 1992, we investigated the feasibility of implementing a commercial longline fishery in the Columbia River below Bonneville Dam and found that implementation of this fishery was also infeasible. Estimates of combined annual exploitation rates resulting from the sport-reward and dam-angling fisheries remained at the low end of our target range of 10-20%. This suggested the need for additional effective harvest techniques. During 1991 and 1992, we developed and tested a modified (small-sized) Merwin trapnet. We found this floating trapnet to be very effective in catching northern pikeminnow at specific sites. Consequently, in 1993 we examined a system-wide fishery using floating trapnets, but found this fishery to be ineffective at harvesting large numbers of northern pikeminnow on a system-wide scale. In 1994, we investigated the use of trapnets and gillnets at specific locations where concentrations of northern pikeminnow were known or suspected to occur during the spring season (i.e., March through early June). In addition, we initiated a concerted effort 1 The common name of the northern squawfish was recently changed by the American Fisheries Society to northern pikeminnow at the request of the Confederated Tribes and Bands of the Yakama Indian Reservation. 3 to increase public participation in the sport-reward fishery through a series of promotional and incentive activities. In 1995, 1996, and 1997, promotional activities and incentives were further improved based on the favorable response in 1994. Results of these efforts are subjects of this annual report. Evaluation of the success of test fisheries in achieving our target goal of a 10-20% annual exploitation rate on northern pikeminnow is presented in Report C of this report. Overall program success in terms of altering the size and age composition of the northern pikeminnow population and in terms of potential reductions in loss of juvenile salmonids to northern pikeminnow predation is also discussed in Report C. Program cooperators include the Pacific States Marine Fisheries Commission (PSMFC), Oregon Department of Fish and Wildlife (ODFW), and Washington Department of Fish and Wildlife (WDFW). The PSMFC was responsible for coordination and administration of the program; PSMFC subcontracted various tasks and activities to ODFW and WDFW based on the expertise each brought to the tasks involved in implementing the program. Objectives of each cooperator were
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