Diet and Energy Density Assessment of Juvenile Chinook Salmon from the Northeastern Bering Sea Trawl Surveys, 2004–2017
Author | : Sabrina Garcia |
Publisher | : |
Total Pages | : 27 |
Release | : 2021 |
Genre | : Chinook salmon |
ISBN | : |
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The northeastern Bering Sea (NBS) is the rearing habitat for juvenile Norton Sound and Yukon River Chinook salmon (Oncorhynchus tshawytscha). In 2002, a marine survey was initiated by the National Oceanic and Atmospheric Administration to study the marine ecology of western Alaska Chinook salmon stocks. Information on the autumn diet (2004–2017) and energetic status (2006–2017) of juvenile Chinook salmon have been collected annually during these surveys to investigate how their feeding and condition respond to changes in the marine environment. During the years observed, juvenile Chinook salmon in the NBS primarily ate fish, including sand lance (Ammodytidae), capelin (Mallotus villosus), and other species, along with smaller proportions of decapods and other invertebrates. Annual average piscivory across all project years ranged from 69% to 96% by mass. Diet composition was size-dependent, and higher proportions of decapods and invertebrates were eaten by smaller juvenile Chinook salmon (