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On the feeding habits of o group red sea bream pagrus major in shijiki bay hirado island japan 1. sequential changes of the diet with growth and its annual variation


Bulletin of the Seikai National Fisheries Research Institute (54): 291-306
On the feeding habits of o group red sea bream pagrus major in shijiki bay hirado island japan 1. sequential changes of the diet with growth and its annual variation
To elucidate the changes of the diet with growth and its annual variations, the diet of O-group red sea bream was investigated in Shijiki Bay (Hirado Island, Nagasaki Pref.). O-group red sea bream were collected by beam trawl and Gochi trawl during 1975-1978. All stomach contents collected were analyzed by 3 different methods, the number method, the points method and the occurrence method. As the fish increased in size, their main food showed sequential changes in the following order: Copepoda, Gammaridea, Mysidacea and finally to larger-sized food organisms, e.g., Natantia, Brachyura and Ophiuroidea. The main food in June and July was Gammaridea and they aggregated in the inner part of the bay. The composition of the food had a close relationship to available food organisms distributed in the environment, as well as to the density of the fish. With high density, as in 1977, O-group red sea bream showed a tendency, even after reaching a larger size, to feed on smaller organisms as compared with other years when the density was low.


Accession: 006027131



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