Abstract
The multiple-cohort approach to population dynamics is seldom used for empirical analysis of catch and effort data due to the complexity of the resulting models and to limitations on available data. The present paper addresses these problems by adopting a discrete time framework and simplifying assumptions for growth, mortality, and recruitment. The result is a readily estimated econometric model of the commercial catch that is consistent with the multiple-cohort paradigm. This model is applied to catch and effort data for the California abalone fishery and the estimates obtained are used to analyze policy.
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