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Maximum Salmonid Densities in Fluvial Habitats in British Columbia Ptolemy, Ron A.
1992
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Abstract: 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
 
Topic: Fish and Fish Habitats
Keywords: habitat, nutrients, salmonids, abundance, density, size, suspended sediments, water chemistry
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