A preliminary report on the chinook productivity study conducted on the Cowichan River during 1992 / by D.A. Nagtegaal, J. Candy and B. Riddell.: Fs97-4/2268E-PDF

"In 1992, the Biological Sciences Branch, Pacific Biological Station, conducted a study of chinook salmon (Oncorhynchus tshawytscha) productivity in the Cowichan River. Major components of this ongoing 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. A mark-recapture study was conducted to augment the fence count. Total return of adult chinook to the Cowichan River was estimated to be 8,678 in 1992. The total return was determined to be the sum of the fence count, the Native food fish catch, and the numbers of broodstock removed below the fence. The number of natural spawners was estimated as 6,676. These were considered minimum estimates since the enumeration fence was washed out due to high water levels prior to the end of the run. Fishery Officers estimated the adult chinook return to be 7,500. In addition, a water management plan is described which was intended to aid upstream movement of chinook"--Abstract, page vii.

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