Feeding Habits of the Macrourid Fish, <i>Caelorinchus anatirostris</i> from the Upper Continental Slope Southwest of Nagasaki, Japan

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  • 長崎南西方大陸斜面域に生息するソコダラ科魚類ネズミヒゲの食性
  • ナガサキ ミナミサイホウ タイリク シャメンイキ ニ セイソク スル ソコダラカギョルイ ネズミヒゲ ノ ショクセイ

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Stomach contents of the macrourid fish Caelorinchus anatirostris Jordan and Gilbert, 1904, collected by a series of beam trawl surveys southwest of Nagasaki, Japan, were analyzed to obtain ecological information on these slope-dwelling fish. The index of relative importance(%IRI)of polychaetes was, on the whole, high for all specimens. The %IRI of crustaceans(copepods and amphipods)was high for small specimens(under 69 mm in pre-anal length), while that for fish(Myctophidae gen. sp., Bregmaceros spp., and others)was highest for large specimens(over 112 mm in pre-anal length). Both crustaceans and fish were found in the stomachs of middle specimens(69–112 mm in pre-anal length). These results indicate ontogenetic changes in the diet of C. anatirostris. No significant difference in stomach contents according to sex or day-night timing of capture was detected.

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