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The relationships between fish density, fish size, and nutrient indicators in streams in British Columbia were examined. Maximum density of eight salmonid species decreased as a non-linear function with mean weight. Regression equations were used to predict the increase in maximum fish density as a function of nutrients in clear streams. Indices of stream fertility were flow-standardized and included total alkalinity, specific conductance and water yield. Fish abundance in glacial streams was negatively related to another hydrochemical parameter, suspended sediment or fixed non-filterable residue, and the function was non-linear. A multiple regression of fish density (fish per 100 m2, FPY) on mean size (grams) by age group, a nutrient index, and suspended sediment: [general FPU = 36.3 (ALK)0.5*(SIZE)-1*(NFR+1)-0.3] using data from 240 streams explained 86% variance. The model was validated with data from both resident and anadromous populations (n=216 samples from 37 streams) but excluded coho salmon. Data fr
Ptolemy, Ron A.. 1992. Maximum Salmonid Densities in Fluvial Habitats in British Columbia. Ministry of Environment, Lands and Parks
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