3 0 0 0 OA 東北太平洋沿岸域におけるヒラメの摂餌生態
- 著者
- 山田 秀秋 佐藤 啓一 長洞 幸夫 熊谷 厚志 山下 洋
- 出版者
- 公益社団法人 日本水産学会
- 雑誌
- 日本水産学会誌 (ISSN:00215392)
- 巻号頁・発行日
- vol.64, no.2, pp.249-258, 1998-03-15 (Released:2008-02-29)
- 参考文献数
- 34
- 被引用文献数
- 31 32
Stomach contents of juvenile Japanese flounders were studied from 3 sheltered and 3 exposed bays. Newly settled flounders (15-20mm in TL) mainly consumed mysids regardless of the availability of food organisms. In sheltered bay areas where mysid densities were low, flounders larger than 60mm preyed mainly on juvenile fish. In exposed inshore areas mysids were abundant and con-stituted the major dietary item of flounder until 200mm. The amount of the stomach contents was not significantly different between the two area types. From monthly investigations it was found that seasonal changes in the feeding activity of juvenile flounders is closely associated with water temperature and mysid abundance. Analysis of the relationship between the total length of flounders (from 15mm to 600mm) and the size and number of prey consumed suggest that small mysid individuals are the most suitable prey items for flounders until 50mm and fish prey items are essential for larger flounders.