Format for Submitted Abstracts
(Example):
|
| Specify topic(s): |
Feeding habits and trophic
interactions
|
| Specify format: |
(1) Oral
(2) Poster or
(3) Oral preferred, but poster acceptable
|
| Title: |
Diel Catches and Food Habits of
Sockeye, Pink, and Chum Salmon in the Central Bering Sea in
Summer
|
| Authors: |
Nancy D, Davis*1, Kerim
Y. Aydin1, and Yukimasa Ishida2
|
1 |
School of Aquatic and Fisheries
Sciences, University of Washington, Box 355020, Seattle,
WA 98195-5020, USA; E-mail: ncdd@u.washington.edu |
| 2 |
Tohoku National Fisheries Research
Institute, Fisheries Research Agency, 3-27-5
Shinhama-cho, Shiogama, Miyagi 985-001, Japan;
E-mail,
ishiday@fra.affrc.go.jp
|
|
| Abstract: |
Sockeye, pink, and chum salmon caught by gillnet in the central Bering Sea were observed for diel changes in prey composition and stomach content weight. Sockeye salmon catches peaked after sunrise, and pink salmon catches increased dramatically between sunset and sunrise. Chum salmon abundance was low, but catches increased after sunrise and in the middle of the day. Sockeye, pink, and chum salmon fed throughout the day and peaks in feeding activity varied. Sockeye feeding increased after sunset, while pink salmon showed two periods of increased feeding activity, one after sunset and another at noon. Chum salmon stomachs contained prey at all times of the day, although there was a peak in feeding activity in the mid-afternoon. Sockeye, pink, and chum salmon stomach contents contained fish during the day, and increased their feeding on euphausiids and copepods during the night. A shift in salmon prey between daytime and nighttime feeding periods suggests that sampling throughout the diel cycle is required to provide an accurate assessment of salmon feeding ecology. |
