Abundance, age, size, sex and coded wire tag recoveries for chinook salmon escapement of Kitsumkalum River, 1991 / by T.C. Nelson for Department of Fisheries and Oceans, Fisheries Branch.: Fs97-4/2182E-PDF

"Estimates of escapement were derived for chinook salmon (Oncorhynchus tshawytscha) of the Kitsumkalum River for 1991 using live-tagging and carcass-recovery operations. This study is part of the Chinook Key Stream Program. The Petersen estimate of adult male and female chinook escapement was 9288. Total escapement estimates are the summation of individual estimates generated by sex and river section (upper and lower). Age-6 chinook comprised the largest proportion of the escapement for both sexes in both sections of the river. Estimated escapement of adipose-clipped chinook to the entire system was 110. 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. The hatchery contribution in 1991 was 2.0% for adult males and 0.9% for females. These hatchery contribution estimates were compared with those estimated using the Mark Recovery Program (MRP) method (Kuhn 1988) of coded wire tag expansions. Using the MRP method, the total hatchery contribution was 1.7% for adult males and 0.8% for females"--Abstract, page vii.

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