日本海西部におけるシイラ漁況の研究-IX : 漬木つきシイラの摂餌状態について

概要

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To investigate the relationship between the amount of stomach contents and the behaviour in the dolphins living near the bamboo rafts, the stomachs contents the fishs were examined quantitatively. The frequency of occurrence of empty stomachs amounted to the considerable propertin, but on the other hand, a number of dolphins were found at the state of satiation. Indivials with empty stomach were found mainly among small sized fishes, and scarecely among larger ones. The amount of stomach contents of dolphins decreased during the periods of alternation of dominant species among medium sized prey fishes, and were very little while juveniles of fishes dominated as prey. The amount of stomach contents of dolphins has a tendency to vary in proportion to the occurrence of medium sized prey fish. The amount of stomach contents during the periods of good catch were in large quantities comparing with those in poor catch. It is suggested that dolphins appear to gather in shelter under bamboo rafts regardness of the state of stomachs, satiated or empty.
公益社団法人日本水産学会の論文