Identification of Columbia Basin Sockeye Salmon Stocks Using Scale Pattern Analyses in 1992
In 1992, the sixth year of the Columbia River Inter-Tribal Fish Commission’s Sockeye Salmon stock identification study, a representative sample of the Columbia Basin Sockeye Salmon population was obtained at Bonneville Dam while known stock samples were collected from Wells (Columbia River km 829) and Tumwater (Wenatchee River km 31) dams. A small sample was also collected from the Methow River. The scales were examined to estimate the age of the fish and were measured for stock identification experiments. Four-year-old fish were estimated to comprise 66% of the Bonneville Dam mixed stock, 80% of the Okanogan known stock, and 48% of the Wenatchee known stock. Five-year-old fish were estimated to comprise 25% of the mixed stock, 2% of the Okanogan stock, and 51% of the Wenatchee stock. Three-year-old fish were estimated to comprise 6% of the mixed stock, 17% of the Okanogan stock, and less than 1% Wenatchee stock.
Fryer, J.K., and M. Schwartzberg. 1993. Identification of Columbia Basin Sockeye Salmon stocks using scale pattern analyses 1992. Columbia River Inter-Tribal Fish Commission Technical Report 93-2. Portland, OR. 42p.