Annual studies of wild westslope cutthroat trout (Oncorhynchus clarki lewisi) were conducted at the lower St Mary River in the East Kootenay for a ten year period from 1980 to 1990. The effects of progressive fishery regulation changes on the population were examined by underwater surveys and standardized angling techniques. Age and growth characteristics of the cutthroat population were also documented. After pollution abatement in the late 1970s, the lower river supported a largely unexploited fluvial trout population (adult spawning and juvenile rearing in tributaries; adult rearing in the mainstem river) with a mean length of 342 mm and a range from 260 to 440 mm. Estimated trout abundance was 118/km of stream channel. Angling regulations in 1980/81 included catch and possession limits of 4 fish and a 'flyfishing' only restriction for approximately 18.5 km. In 1982, the total estimated population was 6400 cutthroat trout >20 cm. From 1984 to 1990, population trends were monitored using a 3.3 km "index sec
Oliver, G.G.. 1990. An Evaluation of Special Angling Regulations for Cutthroat Trout in the Lower St. Mary River. Ministry of Environment. Fisheries Management Report. 97
Topic: Fish and Fish Habitats
Keywords: St. Mary River, westslope cutthroat trout, Oncorhynchus clarki lewisi, abundance, angling, regulations, management, age, size
Scientific Name: Oncorhynchus clarkii lewisi
English Name: Cutthroat Trout, Lewisi Subspecies
Other Identifier: FMR97
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