Abstract
Abstract – The ratio of annual production rate to average biomass (P/B) is sometimes used as a shortcut method of estimating production if biomass is known.P/Bratios vary among salmonid populations in different areas depending on the species, fish size and growing conditions. The hypothesis that annualP/Bratios for salmonid populations can be predicted from the allometric equation:P/B = a W−0.35was investigated in this study. The allometric coefficient (−0.35) was obtained from the literature, andWwas the average weight (g) of fish in the population. Plots ofP/Bversus fish weight for three species of salmonids,Salvelinus fontinalis,Salmo truttaandSalmo salar, showed a declining trend, with a slope consistent with the hypothesis. The coefficientaof the allometric equation was species and habitat dependent. The efficacy of using the allometric formula to estimate theP/Bratio of specific salmonid populations is examined.
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