Age and Length Composition of Columbia Basin Spring Chinook Salmon Sampled at Bonneville Dam in 1991
The Stock Assessment Project of the Columbia River Inter-Tribal Fish Commission (CRITFC) is a part of the US-Canada Pacific Salmon Treaty spawning escapement monitoring program (PST 1985). A principle aim of the project is the design and development of salmon stock identification techniques. Experiments will also be made in the application of these techniques to individual stocks or groups of stocks of Columbia Basin salmon originating above Bonneville Dam, located on the Columbia River at river kilometer 235. This report summarized age and length-at-age composition estimates for spring chinook salmon sampled at Bonneville Dam in 1991. At Bonneville Dam, the spring chinook salmon population is composed of a mixture of both hatchery and natural origin stocks. This research was begun in 1987, and reports of previous results are available (Schwartzberg 1988, 1989; Schwartzberg and Fryer 1990, Fryer and Schwartzberg 1991). Scale pattern analysis was the primary study method.
Fryer, J., C.E. Pearson, and M. Schwartzberg. 1992. Age and length composition of Columbia Basin spring Chinook Salmon sampled at Bonneville Dam in 1991. Columbia River Inter-Tribal Fish Commission Technical Report 92-1. Portland, Oregon. 24p.