Enumeration of juvenile and adult coho salmon at Black Creek, Vancouver Island, 2010 / by K. Campbell, P. Van Will, H.W. Stiff, D. Nagtegaal, E. Miyagi, and K. Duncan.: Fs97-4/2985E-PDF

"The juvenile counting fence on Black Creek was in operation between April 10th and June 9th, 2010, to enumerate and tag juvenile Coho smolt out-migration. During the spring program, a total of 22, 754 smolts were captured and sampled. Of the captured, 6,893 (30%) smolts were successfully coded-wire tagged and released. However, after factoring for short-term tag loss of 0.5%, 6,852 were effectively tagged. The out-migration was composed of 84% age 1.0 smolts and 16% age 2.0 smolts. The adult fence was in operation from October 10th to November 12th, and spawn surveys were conducted from November 8th to December 7th. A total of 3,651 large adult Coho were enumerated through the fence (male to female ratios of 1:1.2) of which 2,212 were tagged for mark-recovery escapement estimation. 1,062 jacks were enumerated. Coded-wire tags were detected in 167 adults and 73 jacks, indicating a low detection rate (8.2%). The single-census Petersen mark-recapture population estimate for adult Coho was 3,952 ±184 fish. The mode of the Bayesian population estimate for adult Coho escapement was 4,050, with a 95% highest probability density of 3,758 – 4,444. Exploitation rate was assumed to be equivalent to the aggregated estimate derived elsewhere for Vancouver Island Georgia Strait Coho: 6.46%. Marine survival was estimated to be 1.89% for Black Creek adult Coho, a decrease from 2009 (3.40%)"--Abstract, page vii.

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