Abundance, age, size, sex and coded wire tag recoveries for chinook salmon escapements of Campbell and Quinsam Rivers, 1993 / by H.R. Frith and T.C. Nelson for Department of Fisheries and Oceans, Biological... : Fs97-4/2251E-PDF

"Estimates of escapement were derived for the Campbell/Quinsam River system for 1993 using carcass tagging as part of the chinook key stream program. The Petersen estimate of chinook escapement was 2,486 in 1993 and includes hatchery removals (sales, broodstock, mortalities) and chinook passed over the hatchery fence. Males and females were mostly age 5, except in Quinsam Hatchery where males were mostly age 3. The female chinook age distribution was similar for the Campbell River, Quinsam River and the hatchery with age 5 fish contributing greater than 70%. Males were more variable in age distribution and ranged from 72.2% age 5 in Campbell River to 26.2% age 5 in Quinsam Hatchery. Estimated escapement of adipose-clipped chinook to the entire system was 133 in 1993. This estimate was further stratified by age, sex, and tag code. The total hatchery contribution (marked and unmarked) to the escapement was estimated by expanding the number of observed adipose clips by the adipose-clip mark rate at release. In 1993, the hatchery contribution was 63.9% and 70.8% for male and female chinook escapements, respectively. These hatchery contribution estimates were compared with those estimated using the Mark Recovery Program (Kuhn 1988) method of coded wire tag expansions. Using the MRP method, the total 1993 hatchery contribution was 61.6% for adult males and 65.8% for adult females"--Abstract, page viii.

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