A preliminary report on the chinook productivity study conducted on the Cowichan River during 1990 and 1991 / by D.A. Nagtegaal, J. Candy and B. Riddell.: Fs97-4/2265E-PDF

"In 1990 and 1991, the Biological Sciences Branch, Pacific Biological Station, conducted a study of chinook salmon (Oncorhynchus tshawytscha) productivity in the Cowichan River. Major components of this study include: i) enumeration of spawners, ii) estimation of native food fish catch, iii) recording hatchery broodstock removals, iv) biological sampling and coded-wire tag (CWT) data collection. In 1991, a mark-recapture study was also conducted to augment the fence count. Total returns of adult chinook to the Cowichan River were estimated to be 5,094 in 1990 and 5,065 in 1991. These were considered to be minimum estimates since in both years the enumeration fence was washed out due to high water levels prior to the end of the run. Fishery Officers estimated adult chinook returns in 1990 to be 5,300 and in 1991 to be 10,000. In addition, a water management plan was executed by the Department of Fisheries and Oceans, Fisheries Branch, in conjunction with the Ministry of Environment and Parks and Fletcher Challenge Canada, Ltd., Pulp and Paper Division in Crofton"--Abstract, page vi.

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