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The number of adult wild steelhead trout returning to the Keogh River on northern Vancouver Island between December 2010 and May 2011 was estimated by mark-recapture methods. The summed mark recapture estimate of males and female returns was 72 wild spawners (95% CL of 22-156), of which 29 were females. These were supplemented by an estimated 32 (95% CL 6 to 40) hatchery strays, giving a total of 104 potential spawners. A Logie 2100C resistivity counter and fence trap provided an independent estimate of 238 net upstream migrants but this estimate was likely skewed high due to milling of hatchery fish in the lower river which resulted in multiple traverses of the counter by the same fish.
Don J.F. McCubbing,, Peter Mitchell and Matt Clarke. 2012. Adult steelhead trout (Oncorhynchus mykiss) and salmonid smolt migrations at the Keogh River, BC, during winter 2010 and spring 2011. Ministry of Environment. Fisheries Project Report. 138
Topic: Fish and Fish Habitats
Keywords: Keogh River, Steelhead
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