底魚類の食性に関する研究第1報カレヒの食性に就いて

抄録

The writer examined the morphological difference in the mouth part as well as the contents of the stomach of six flat fishes, vjz., Eopsetta grigorjewi, Cleisthenes herzensteini, Hippoglossoides dubius, Dexistes rikuzenius, Tanakius kitaharae, and Glyptocephalus stelleri, collected in the South-Western part of the Japan Sea by means of the townet. The first three species have the large oblique mouth, rather sharp teeth on each jaw, long and numerous gill-rakers, while the other three species have the small mouth, minute blunt teeth on each jaw, short and small gill-rakers. It would be regarded that the mode of their feeding habit has developed adapting to such particular structure of the mouth and teeth. Namely, the former three species feed mainly on active creatures such as small crustaceans living on or close to the sea-bottom; but the latter three species feed mainly on small sluggish animals such as ophiurans and polychaets living on or embedded in the sand and mud of the sea bottom.