Sampling was conducted in the Kispiox River system over three consecutive years (1980-1982) to (1) monitor steelhead fry recruitment, (2) estimate carrying capacity in terms of steelhead smolt yield, and (3) assess enhancement potential and options for the stock. Estimates of total fry in late August ranged from 408,000 in 1982 to 646,000 in 1981. Although the largest fry population corresponded to the highest estimated adult return (1175 adult fish in 1981), the pattern was not consistent. It was concluded that factors other than escapement (notably stream discharge) affected fry population levels. Yearlings progressively increased from 1980 (97,500) to 1982 (309,000); the same applied to age 2+ fish (25,000 in 1980 to 81,000 in 1982). Theoretical smolt yield capacity was estimated using five different methods. Estimates based on sampled biomass densities compared favourably with those derived from theoretical adult escapement figures and suggested a maximum of 33,300 smolts per year from the system.
Tredger, C.D.. 1983. Juvenile Steelhead Assessment in the Kispiox River (1980-1982). Fisheries Report
Keywords: Kispiox River, steelhead, recruitment, smolt yield, enhancement, population estimates, escapement, biomass density, habitat
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