Fish Population Dynamic and Stock Assessment

9.1.3 Recruitment overfishing

This is a situation in which the parent stock is reduced by fishing to the extent that not recruits are produced to ensure that the stock will maintain itself. To avoid recruitment overfishing, the young ones (the recruits) are allowed to grow and they should attain the maturity and at least they should reproduce once or two times in its life cycle. The parents should not be caught for which mesh size should be optimized to allow the spawners to escape from the net. The prolonged recruitment overfishing can also lead to stock collapse. These also occurs under unfavorable environment conditions.

The stock-recruitment relationship is worked by three methods. Refer chapter on stock-recruitment relationships may appear good for on temperate spawner in which the spawning in synchronized. For most of the tropical species, where the spawning season is extended and species are prolific breeders, the relationship between the stock and requirement appears not consistent.