Northwest Fisheries Science Center

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Document Type: Contract Report
Center: NWFSC
Document ID: 8529
Title: Monitor and Evaluate the Genetic Characteristics of Supplemented Salmon and Steelhead in the Snake River Basin
Author/Editor: E. A. Berntson, Robin S. Waples, Donald M. Van Doornik, E. LaHood, Paul Moran
Publication Year: 2015
Type of Report: Annual Progress Report
Contracting Agency: Bonneville Power
Contract Number: 1989-096-00
Project Number: 46273 REL 75
Pages: 24
Date: 3/4/2015
Keywords: Chinook salmon,steelhead,Snake River,hatchery,artificial propagation
Abstract:

            This progress report summarizes the activities and accomplishments related to BPA Project 1989-096-00 for the calendar year 2014.  The primary goal of this project is the genetic monitoring of Chinook salmon and steelhead populations in the Snake River Basin, with a particular interest in the effects of artificial propagation on both targeted and non-targeted populations in the basin.  We have addressed this with a two-tiered approach: genetic monitoring through annual sampling of juveniles at a number of reference sites in multiple Snake/Salmon river sub-basins (Tier 2), and a more intensive investigation of relative reproductive success (RRS) of hatchery and natural fish in three river systems through concentrated sampling of juveniles at two life stages (parr, migrants) and returning adults (Tier 3).  Our project examining population-level genetics of steelhead in the Salmon River basin has shown that overall, populations within subbasins are genetically differentiated both between major drainages, and also between upper and lower reaches within the South Fork and Middle Fork.  We also see an affinity between headwater locations from the Upper Salmon and Middle Fork, which may provide evidence of occasional connectivity between the otherwise isolated spawning habitats.  This year we also present the initial year of adult-to-juvenile results for our RRS study of Chinook salmon in the Lostine River, where we find reduced RS of hatchery fish (males more reduced than females) compared with their natural-origin counterparts.  No adult-to-adult results are yet available for the Lostine River; however, we can now report 9 years of adult-to-juvenile and 6 years of adult-to-adult RRS in Catherine Creek Chinook salmon.  We saw equal RRS of hatchery fish when measured as adult-to-juveniles, though slightly lower RRS when measured as adult-to-adult.  Both jack males and precocious male parr contribute to productivity in this system, though at a lower RS than older adult males.  Regarding the RRS study in Little Sheep Creek steelhead, we report on our collection activities here but laboratory analyses were temporarily deferred due to reduced funding.

Description:

Annual progress report for the calendar year 2014.

Theme: Recovery and rebuilding of marine and coastal species
Foci: Evaluate the effects of artificial propagation on recovery, rebuilding and sustainability of marine and anadromous species.