Estimation of total chinook mortality associated with seine fishing in Johnstone Strait and Juan de Fuca Strait during 1988 / by D.A. Nagtegaal, P.J. Starr and B. Riddell.: Fs97-4/2203E-PDF

"In 1988 the Biological Sciences Branch, Department of Fisheries and Oceans, conducted a study to assess total chinook (Oncorhynchus tshawytscha) mortality in the Johnstone Strait sockeye (0. nerka) and chum (O. keta) seine fishery and the Juan de Fuca Strait sockeye seine fishery . Department of Fisheries and Oceans catch statistics determined from records of salmon sales are suspected, by some user groups, to underestimate the catch of chinook by seine gear. The objective of our study was to independently estimate the total chinook catch in southern British Columbia seine fisheries. Total chinook mortality in the Johnstone Strait sockeye fishery was estimated to be 9,914 (95% CL: 5,379-16,589) of which 3,893 were recorded as juveniles, 2,033 jacks, and 3,988 adults. Commercial records of sales for the 1988 season indicated a catch of 2,269 jack chinook and 4,297 adults. Total chinook mortality in the Juan de Fuca fishery was estimated to be 42,048 (95% CL: 20,375-78,104) of which 22,245 were recorded as juveniles, 11,711 jacks, and 8,092 adults. Commercial sales slip records for 1988 reported 6,877 jacks and 3,587 adults. The ratio of estimated catch to reported catch for chinook under 2.3 kg (5 lb) in Johnstone Strait was 2.6 and for Juan de Fuca was 4.9. Total chinook mortality in the Johnstone Strait chum fishery was estimated to be 5,085 (95% CL: 1,121-15,020) of which 1,563 were adults, 1,600 jacks, and 1,922 juveniles. Commercial sales slip records for 1988 reported 623 adult and 955 jack chinook"--Abstract, page iii.

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