Abstract
We describe a technique, derived from the von Bertalanffy growth curve and from the mortality equation, which allows the estimation of potential catches from an unexploited stock of mollusca on the basis of the population's length composition data. Comparison with results obtained from age composition data shows that both methods give similar values for mortality rates and yields. That technique could be very useful when it is difficult or impossible to obtain systematic age readings.Key words: Mya arenaria, growth, mortality, yield
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