Forty stream systems located in the Lower Mainland and Sechelt Peninsula were investigated in 1979 by the Fish and Wildlife Branch (Ministry of Environment).
Extensive sampling indicated juvenile sea-run cutthroat trout occupy reaches primarily with gradients in excess of 0.5% and no wider than 5 m. Reaches less than 0.5% and wider than 5 m were inhabitated largely by other salmonid and coarse fish species. The amount of available cutthroat trout nursery space downstream of obstructions was estimated to be 60 hectares, and upstream of obstructions to be 17 hectares. Twelve hundred and eighty hectares, or 94% of all stream space (approximately 1,355 hectares), are unsuitable for sea-run cutthroat trout production. Extrapolations from population estimates indicate the present adult sea-run cutthroat trout population (ingoring angler harvest estimates) within all study streams to be only 10,000 (mean range from 7,500 - 12,600). This represents 42% of the maximum number yieldable from the same 60 hectares. About 30,000 adult cutthroat trout can theoretically be produced from all available (both anadromous and non-anadromous) nursery space if habitats were operating at their maximum production levels for this species.
De Leeuw, A. D., Stuart, K. M.. 1981. Small Stream Enhancement Possibilities for Sea-Run Cutthroat Trout in the Lower Mainland and Sechelt Peninsula: Habitat and Fish Resources (Volume 1 of 4). Fish and Wildlife Branch. Fisheries Report
Topic: Fish and Fish Habitats
Keywords: enhancement, opportunities
Scientific Name: Oncorhynchus clarkii
English Name: Cutthroat Trout
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