Methods of Estimating Effects of Fishing on Fish Populations

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Abstract
The yield from an exploited fish population depends on the rate of harvesting (fishing mortality rate) and the magnitude of the standing stock. The latter is determined by rates of increase from recruitment and growth and rates of loss from both natural and fishing mortality. Since we lack information respecting the density‐dependence of each of these rates, various simplifying assumptions are made in practice in developing mathematical models of exploited fish populations. Such models are described, with illustrations of their application to important commercial fisheries. Models of fisheries involving competing fish species, and the employment of computer simulation in studies of fishery‐dynamics are also discussed.

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