Experiments in Identifying Hatchery and Naturally Spawning Stocks of Columbia Basin Spring Chinook Salmon Using Scale Pattern Analyses (1989)
The purpose of this study, a part of the Columbia River Inter-Tribal Fish Commission Stock Identification Project, is to explore the feasibility of Columbia Basin spring Chinook Salmon stock identification through the use of scale pattern analyses. This research began in 1988 with a study designed to differentiate hatchery and naturally spawning stocks in the Deschutes and Wenatchee subbasins of the Columbia River. A long term goal of the Stock Assessment Project has been to develop stock composition estimation techniques applicable in mixed stock areas to differentiate hatchery and naturally spawning stocks. Data from the two study areas was therefore pooled to test in 1988 to test the subsequent effects on scale-variable dispersion and on group classification accuracies. In 1989, the study was expanded to include spring Chinook stocks in the Snake Basin. In addition, mixed stock scale samples of unknown origin collected from Bonneville Dam were used in the 1989 analysis to estimate the hatchery and naturally spawning stock composition of the entire Columbia Basin adult upriver spring Chinook Salmon population.
Schwartzberg, M. and J. Fryer. 1990. Experiments in identifying hatchery and naturally spawning stocks of Columbia Basin spring Chinook Salmon using scale pattern analyses. Columbia River Inter-Tribal Fish Commission Technical Report 90-3. Portland, OR. 37p.