Age Composition of the 1995 Klamath River Fall Chinook Run

摘要

The age composition of the in-river run of Klamath River fall chinook is anintegral part of the database used to manage this salmon stock. Age composition is used in conjunction with annual estimates of in-river harvest and escapement to estimate the ocean stock size of Klamath River fall chinook for fishery management purposed. A total of 13,994 scale samples were examined to estimate the age composition of fall chinook in the Klamath River in 1995. The scales were collected from 13 locations and were aged using scales from coded wire tag recoveries as references. Age composition estimates from each sampling location were weighted by the magnitude of that location's contribution to the in river run. Because some locations were inadequately sampled, surrogate samples were used represent to them. Angler harvest and in-river run size for 1995 were estimated applying the age composition to the California Department of Fish and Game's population 'megatable'. Seven versions of these estimates are given, using different combinations of surrogate samples.