Life history and population characteristics of anadromous Dolly Varden char in the Keogh River on northern Vancouver Island were studied from 1975 to 1978. Dolly Varden migrating from the ocean in 1977 averaged 280 mm (150-470 mm) and ranged from two to nine years old. In total, 1800 fish entered the river from July until October, of which 50% were female. Adults averaged 340 mm and comprised 40% of the run. Sixty percent of the run were 'sub-adults' that averaged 220 mm after returning from their first ocean migration to overwinter mainly in lakes. Eighty-three percent of adult females were mature enough to spawn, but only 21% of the younger sub-adults were mature. Rate of ovary development accelerated from August to October. Average fecundity for migrants in 1977 was 1642 eggs per female ranging from 101 to 5321 as a function of fish length. Freshwater production of juvenile Dolly Varden occurred in tributaries as well as in the mainstem river. Rate of growth in freshwater was slow; fry required, on average
Smith, H.A., Slaney, P.A.. 1980. Age, Growth, Survival and Habitat of Anadromous Dolly Varden (Salvelinus malma) in the Keogh River, British Columbia. Ministry of Environment. Fisheries Management Report. FMR76
Topic: Fish and Fish Habitats
Keywords: Dolly Varden char, Keogh River, Vancouver Island, migration, management, size, age, sex ratio, fecundity, growth, habitat, survival, fishery, sport, harvest
Scientific Name: Salvelinus malma
English Name: Dolly Varden
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