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, 1990 Annual Report.

Technical Report · Sat Dec 01 04:00:00 EST 1990

DOI:https://doi.org/10.2172/10109182· OSTI ID:10109182

Nigro, Anthony A

The papers in this document report the results of studies to develop a Columbia River basin-wide program to control northern squawfish predation on juvenile salmonids. Our studies focus on (1) determining where in the basin northern squawfish predation is a problem, (2) conducting various fisheries for northern squawfish, and (3) testing a plan to evaluate how well fisheries are controlling northern squawfish populations. These studies were initiated as part of a basin-wide effort to reduce mortality of juvenile salmonids on their journey from natal streams to the ocean. Earlier work in the Columbia River basin suggested predation by northern squawfish on juvenile salmonids may account for most of the 10 to 20 percent mortality juvenile salmonids experience in each of eight Columbia and Snake river reservoirs. Modeling simulations based on work in John Day Reservoir from 1982--1988 indicated it is not necessary to eradicate northern squawfish to substantially reduce predation-caused mortality of juvenile salmonids. Instead, if northern squawfish were exploited at a 20 percent rate, reductions in their numbers and restructuring of their populations could reduce their predation on juvenile salmonids by 50 percent. We tested three fisheries in 1990, a tribal long-line fishery, a recreational-reward fishery, and a dam hook-and-line fishery.

• Research Organization: Oregon Department of Fish and Wildlife (ODFW)
• Sponsoring Organization: United States. Bonneville Power Administration.
• OSTI ID: 10109182
• Report Number(s): DOE/BP-07084-1; ON: DE92003428
• Country of Publication: United States
• Language: English

Related Subjects

13 HYDRO ENERGY
130600
54 ENVIRONMENTAL SCIENCES
540350
550100
BEHAVIORAL BIOLOGY
COLUMBIA RIVER
COLUMBIA RIVER BASIN
ENVIRONMENTAL ASPECTS
EVALUATION
FISHERIES
IMPLEMENTATION
JUVENILES
MORTALITY
PREDATION (BIOLOGY)
PTYCHOCHEILUS OREGONENSIS - CONTROL - COLUMBIA RIVER WATERSHED
RIVERS
SITE RESOURCE AND USE STUDIES
TESTING