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During August 1986, the Fisheries Improvement Unit conducted a biophysical assessment of the Cranberry River, a tributary to the Nass River. Investigations were premised on determining the status of steelhead stocks (ie., current levels of production relative to estimated habitat carrrying capacity through quantitative sampling of juvenile fish. Electrofishing was the primary method of fish collection. Sample site results were weighted according to habitat suitability based on depth and velocity, and then expanded to represent reach-specific fish populations. Live summer juvenile steelhead populations were estimated at 280,000 fry and 100,000 yearling fish. Current models incorporating temperature, growth and survival predicted a smolt yield of 20,000 based on 1986 juvenile populations and an average smolt age of 3.3 years (70% age 3 and 30% age 4 smolts). Adult returns of approximately 1200 fish after commercial and native harvest can be anticipated at current production levels. An additional 15-20% may be k
Sebastian, Dale. 1987. Steelhead Production Characteristics of the Cranberry River-Nass River System 1986. Recreational Fisheries Branch. Fisheries Assessment and Improvement Unit. FIU-06
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