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A preliminary habitat capability model (HCM) for predicting standing crop (kg/ha) of resident trout and char in streams was constructed with data sets from 38 streams in western North America. Two variables were incorporated in the final model which was derived from 24 complete data sets. Ninety-two percent of the variance in standing crop was explained by the regression equation SC=190(C) + 13,900 (NO3N)2 where SC is standing crop in kg/ha, C is the proportion of the wetted area as cover for trout and char (Appendix B), and NO3N is the nitrate nitrogen concentration in mg/l, both measured in August to September. Comparisons to a nine variable Wyoming model (HQI; Binns 1982) indicated HQI predictions averaged ca. 25% less than predictions from the simplified HCM. Preliminary testing using a sample of streams in British Columbia indicated that HQI was more accurate and was preferable if sufficient data are available. Further collection of data in BC is required to improve and test these capability models owing
Rosenau, M.L., Slaney, P.A.. 1983. A Preliminary Capability Model for Estimating Standing Crop of Resident Salmonids in Streams. Ministry of Environment. Fisheries Project Report. FPR10
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