Northwest Fisheries Science Center

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Document Type: Report
Center: NWFSC
Document ID: 8925
Title: Genetic method of stock identification in mixed populations of salmon
Author/Editor: George B. Milner, David J. Teel, Fred M. Utter, Gary A. Winans
Year: 1984
Institution: Report of the National Marine Fisheries Service, Northwest and Alaska Fisheries Science Center. Seattle, Washington

Basic procedures are presented and illustrated for a genetic stock identification (GSI) method that is based on the detection of genetic variability with gel electrophoresis.  The method uses naturally occurring genetic differences between stocks to provide estimates of the composition of mixed stock fisheries.  Three examples are given to illustrate the application of the GSI method to management of chinook salmon Oncorhynchus tshawytscha fisheries.  The examples include:  1) estimates for four potentially contributing populations of fall-run fish intercepted at Bonneville Dam (Columbia River) in 1980 and 1981, 2) an analysis of the 1982 winter gill-net fishery in the lower Columbia River, and 3) an analysis of the ocean troll fishery along the Washington coast during May 1982.  The analytical, economic, and temporal advantages of the GSI method indicate that this procedure is a major new tool for the management of mixed stocks of anadromous salmonids.