Abstract
Four models of the dynamics of an exploited population of fish are presented, and methods for the estimation of the parameters of each model from a mark recapture experiment are developed. The four models are (1) constant loss rate from the population, (2) constant natural mortality, with time varying fishing mortality proportional to fishing effort, (3) constant natural mortality, and time varying vulnerability to fishing gear, and (4) interchange between a vulnerable population and an invulnerable one, with natural mortality occurring in both populations, but fishing mortality occurring only in one. The parameter estimation methods are developed for a single release group recovered over discrete intervals. Each of these models is applied to tagging data on skipjack tuna (Euthynnus pelamis) in the western tropical Pacific.
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