Gear selectivity

Sathianandan, T V (2017) Gear selectivity. In: Course Manual Summer School on Advanced Methods for Fish Stock Assessment and Fisheries Management. Lecture Note Series No. 2/2017 . CMFRI; Kochi, Kochi, pp. 258-261.

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Abstract

Most of the fishing gears are selective for certain length range of fish thus excluding very small and very big fish. This property of fishing gears is termed as gear selectivity. Thompson and Ben-Yami (1984) considered selectivity as the capacity of any method of gear type to capture certain fractions or sections of the fish population whether grouped by species, age, size or behaviour and to exclude others. Gear selectivity needs to be considered when we go for estimation of size composition of fish. The ultimate aim of studies on size selection is to suggest suitable mesh sizes to catch fish of either economically optimum size or an optimum size for the judicial exploitation of the stock. It is an important tool for fisheries managers for regulating the minimum mesh sizes of fishing fleet by determining the minimum sizes of the target species in certain fisheries. Mesh sizes are regulated to conserve the spawning stock and to increase the long term sustainable yield. Estimation of total mortality and prediction of future yield using prediction models etc. will be affected by selectivity of gears

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