Normandale Creek (2531m2) provides spawning and nursery grounds for lake‐run rainbow trout, Salmo gairdneri Richardson, brown trout, Salmo frutta L., and coho salmon, Oncorhynchus kisutch (Walbaum). Upstream movements are significantly correlated with peak stream discharge (P < 0.05). In 1973–1974, 59 adult salmonids constructed 86 nests of which 60% were disturbed by re‐use or sand deposition. From a calculated deposition of 90 400 ova, 483 juveniles, 6 cm in fork length (f.l.), were resident in the stream when estimates by electrofishing first became valid. Estimated within‐stream (i.e. all sections combined) monthly densities of wild juveniles >6 cm f.l. ranged from six to 22 fish (100 m2)−1, and biomass from 1.3 to 3.1 gm−2. The highest within‐section biomass was 8.3 gm−2 in November. Additions of hatchery‐reared rainbow trout temporarily increased monthly within‐stream juvenile density up to 23 fish (100 m2)−1, and biomass to 8.2 g m−2. Density and biomass were positively correlated (P < 0.05) with both instream and bank cover, and biomass negatively correlated (P < 0.05) with gradient. The importance of substratum and flow characteristics on juvenile density and biomass was strongly indicated although not statistically significant. Annual within‐section production of juveniles > 6 cm f.l. ranged from 4.79 to 5.93 g m−2 year−1 in Sections III and IV, respectively. Inclusion of calculated probable numbers of fish < 6 cm f.l. increased within‐section production from 5.93 to 18.65 g m−2 year−l in upstream Section IV.
Journal of Fish Biology – Wiley
Published: Oct 1, 1982
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