2024-03-28T14:12:35Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/384252022-11-17T02:08:08Zhdl_2115_20049hdl_2115_141夏季の北海道太平洋沖陸棚斜面域におけるキチジの分布様式と栄養状態Spatial distribution patterns and nutritional status of kichiji rockfish Sebastolobus macrochir in summer on the continental slope off the Pacific coast of Hokkaido, Japan大村, 敏昭濱津, 友紀山内, 務巨高橋, 豊美栄養状態キチジ餌料価値肥満度分布陸棚斜面663The spatial distribution patterns and nutritional status of the kichiji rockfish Sebastolobus macrochir were investigated off the Pacific coast of Hokkaido during the summer of 2001-2004. Fish≤100mm SL were chiefly distributed at depths of 550-750m off the southeastern area of Cape Erimo where their principal prey, gammarid amphipods, were abundant. The 101-150mm SL fish were concentrated in shallow areas where their principal prey, the decapod Neocrangon communis, was abundant. Conversely, fish≥151mm SL were observed to utilize various prey items and were widely distributed in the study area, suggesting a foraging strategy to reduce the intra- and inter-specific competition for food and to obtain food efficiently. The condition factor and hepatosomatic index of S. macrochir tended to decrease with increased depth. Given that the principal prey of S. macrochir ranged from decapods (high energy content) to ophiuroids (low energy content) with increased depth, the variation in the nutritional status of fish could be related to differences in the energy content of their prey. Despite feeding on prey items with a relatively high energy content, the nutritional status of 101-150mm SL fish was low. This is probably due to the fact that the fish in this size class grow rapidly.日本水産学会Journal Articleapplication/pdfhttp://hdl.handle.net/2115/38425https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/38425/1/takahashi1-57.pdf0021-5392AN00193422日本水産学会誌7234304392006-05-15jpninfo:doi/10.2331/suisan.72.430110004818301http://ci.nii.ac.jp/naid/110004818301本文データは学協会の許諾に基づきCiNiiから複製したものであるpublisher