南米チリ・フィヨルドに放流された日本産シロザケ（Ｏｎｃｏｒｈｙｎｃｈｕｓ　ｋｅｔａ）幼魚の食性について

• 平川 和正

  日本海区水産研究所

書誌事項

タイトル別名

• Feeding habit of juvenile chum salmon, Oncorhynchus keta, released into a Chilean Fjord, South America.

抄録

The stomach contents of juvenile (FL: 8-12cm) chum salmon, Oncorhynchus keta, released into Aysen Fjord (45°15'S-45°30'S, 72°50'W-73°30'W) in the southern Chile were compared with the regional and diel vertical distributions of zooplankton collected with a Norpac net and MTD nets during the period from September to October 1985. Their primary preys drastically changed from terrestrial insects, small epibenthic gammarid amphipods and barnacle larvae in the fjord to large calanoid copepods, callianassid decapod zoeae, euphausiid furcilia larvae and fish eggs in Moraleda Channel connected to the fjord. These copepods which mainly consisted of the copepodite IV, V stages and adults of Calanus chilensis, Calanoides patagoniensis, Rhincalanus nasutus and Metridia lucens were very important diets, in particular, adult females of whih comprised numerically about 70-90% of each population found in the stomach.<BR>Feeding conditions of the fish are discussed from the relationship between diel vertical migrations of these females and salinity gradients at the surface layer in the fjord and the channel.

収録刊行物

• 水産増殖

  水産増殖 38 (2), 157-163, 1990

  日本水産増殖学会

キーワード

• シロザケ幼魚
• チリ・フィヨルド
• 胃内容物組成
• かいあし類
• 日周鉛直移動

詳細情報

• CRID: 1390001204715115904
• NII論文ID: 130003865161
• NII書誌ID: AN00124667
• DOI: 10.11233/aquaculturesci1953.38.157
• ISSN: 21850194
• ISSN: 03714217
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可