Abundance, age, size, sex and coded wire tag recoveries for chinook salmon escapement of Kitsumkalum River, 1992 / by T.C. Nelson for Department of Fisheries and Oceans, Fisheries Branch.: Fs97-4/2201E-PDF

"Estimates of escapement were derived for chinook salmon (Oncorhynchus tshawytscha) of the Kitsumkalum River for 1992 using live-tagging and carcass-recovery operations. This study is part of the Chinook Key Stream Program. The Petersen estimate of all adult male and female chinook escapement to the total Kitsumkalum River was 12,437. In this report, 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 the upper section of the river and for females in the lower section; males in the lower section were mostly age-5. The total estimated escapement of adipose-clipped adult male and female chinook to the entire Kitsumkalum River was 407 fish (3.3% of the total estimated escapement). This estimate was further stratified by age, sex and tag code. Proportional hatchery contributions (marked and unmarked) to the escapement were estimated using the Key Stream approach (Method A), wherein the adipose fin clip rate at release and a weighted adipose clip rate at return are applied to the estimated escapement of chinook. Using Method A, the total hatchery contribution was 469 fish or 3.8% of the total adult male and female escapement estimate (3.0% for adult males and 4.5% for females). These hatchery contribution estimates were compared with those estimated using the Mark Recovery Program approach (Method B), wherein the coded wire tag rate at release is applied to the estimated escapement of chinook possessing a CWT. Using Method B, the total hatchery contribution was 454 fish or 3.6% of the total adult male and female escapement estimate (2.9% for adult males and 4.4% for females)"--Abstract, page vii.

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