Journal Article Potential changes in feeding behavior of Antarctic fish, Pseudotrematomus bernacchii (Boulenger, 1902) on the East Ongul Island, Antarctica

9 ( 4 )  , pp.389 - 392 , 2015-12
The feeding habits of the Antarctic fish Pseudotrematomus bernacchii (Previous name: Trematomus bernacchii) under the fast ice around Japanese Syowa Station were investigated in the summers of 2004/2005 and 2009/2010. The results showed that amphipods and krill were the major prey. However, there was a significant difference in the proportions of larger invertebrates such as squids, octopus and other crustaceans found in the fish stomachs between 2009/2010 and the previous years. Moreover, the percentage of amphipods and krill in fish stomachs declined over the 5-year period in all fish size classes. Several factors including sea ice melting, habitat and environmental changes might have influenced the pattern of feeding behavior.
2004/2005年及び2009/2010年の夏季に南極昭和基地付近の沿岸定着氷下において南極産魚類、ショウワギス(Pseudotrematomus bernacchii (Boulenger, 1902))の食性を調査した。その結果、胃内容物の調査より、端脚類及びオキアミが主要な餌であることがわかった。しかし、各調査期において、イカ、タコ、その他甲殻類などの大型無脊椎動物の占める割合に有意な差が生じた。そして、すべての大きさの個体において、胃内容物に占める端脚類及びオキアミの割合は5年の間で減少した。これは、海氷融解、生息域、環境などの変化が摂餌行動のパターンに影響したことが原因かもしれない。

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