Journal Title
Title of Journal: Environ Biol Fish
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Abbravation: Environmental Biology of Fishes
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Publisher
Springer Netherlands
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Authors: Osamu Sakai Orio Yamamura Yasunori Sakurai Tomonori Azumaya
Publish Date: 2012/01/27
Volume: 93, Issue: 3, Pages: 319-331
Abstract
Seasonal ontogenetic and diel variations in the diets of chum salmon Oncorhynchus keta were examined by analyzing the stomach contents of 1398 fish 300–755 mm fork length collected in the Bering Sea during summer and early autumn of 2002 Whereas mesozooplankton including euphausiids hyperiids and gastropods constituted the greatest portion of the stomach contents during the summer forage fishes Stenobrachius leucopsarus and Atka mackerel Pleurogrammus monopterygius were the most important items during early autumn Although no apparent diel trend was found in feeding intensity distinct diel differences in prey composition were observed Chum salmon caught in the morning contained Stenobrachius leucopsarus whereas those caught in the afternoon had mainly fed on euphausiids Thus chum salmon diets change temporally because of changes in prey availability that result from differences in the annual life cycles and diurnal vertical migrations of prey speciesWe thank the officers and crew of the RV Kaiyomaru We are grateful to A Tsuda and S Urawa for their cooperation in sample collection We also thank R Brodeur N Davis K Uchikawa and N Tanimata for their advice This study was financially supported by the Japan Fisheries Agency
Keywords:
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- Immediate impacts of the second impoundment on fish communities in the Three Gorges Reservoir
- Prey use of wetland benthivorous sunfishes: ontogenetic, interspecific and seasonal variation
- Prey use of wetland benthivorous sunfishes: ontogenetic, interspecific and seasonal variation
- Trophic polymorphism in introduced pumpkinseed ( Lepomis gibbosus ) inhabiting Iberian reservoirs
- Endocrinological investigation into the reproductive cycles of two sympatric skate species, Malacoraja senta and Amblyraja radiata , in the western Gulf of Maine
- Decreased trophic position as a function of increasing body size of a benthic omnivorous fish from the largest freshwater lake in China
- Assessing genetic diversity of wild populations of Prenantȁ9s schizothoracin, Schizothorax prenanti , using AFLP markers
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- Energy allocation in juveniles of a warm-temperate reef fish
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- Nest site preference and intrasexual competition in female sockeye salmon, Oncorhynchus nerka
- Habitat and life history differences between two species of Gambusia
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- Evaluation of the physiological status of the Pacific sardine, Sardinops sagax caeruleus , acclimated to different thermal regimes based on selected blood parameters
- Use of lapillus otolith microchemistry as an indicator of the habitat of Genidens barbus from different estuarine environments in the southwestern Atlantic Ocean
- Effect of water quality on growth of four fish species in the Iténez basin (Upper Madera, Amazon)
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- Spatial ecology of juvenile lemon sharks ( Negaprion brevirostris ) in tidal creeks and coastal waters of Eleuthera, The Bahamas
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