Fisheries oceanography in India

Abstract

The term, 'fishery' is not meant to refer to fishes exclusively. It comprtses forms such as the enormous whales which are really mammals, on the one hand, to fishes proper and to such forms as prawns, . crabs, lobsters, shrimps, turtles, oysters, clams, and so on. Species which swim about freely and migrate from place to place, such as the tunas, sardines, mackerels, etc. constitute pelagic fisheries; those which are confin ed t,o the sea bottom mostly, flat fishes, perches, rays, prawns, lobsters, etc. constitute tbe, demersal fisheries.