columbia river basin fish and wildlife program annual ...

1. RESERVOIR MORTALITY AND WATER BUDGET EFFECTIVENESSI. COMPLETED PROJECTSNone.II. FY 1990 ONGOING PROJECTSPROJECTNUMBER TITLE PROJECT STATUS SCHEDULE AND MILESTONES82-3 Magnitude and Dynamics ofPredator-Caused Mortality onHealthy Juvenile Salmonids inColumbia and Snake RiverReservoirs - USFWSProiect Officer: W. MaslenQbiectives: Determine theextent of predator-causedmortality on healthy vs.diseased, injured, and deadjuvenile salmonids and developand evaluate prey protectivemeaures.Date initiated: 1983Results/Conclusions: An index forestimating consumption by squawfishwas refined, for use in combinationwith the abundance index (ProjectNo. 82-12) to determine the significanceof predation system-wide.Laboratory experiments on prey selectionwere conducted to develop experimentalprotocol for future prey selectionstudies.FY 1991: Continue prey selection experimentationin the laboratory and the field to determinerelationship between predation and prey conditionand develop and evaluate prey protective measures(e.g., reducing predator-prey encounters, reducingpredator feeding deficiency, etc.).