Journal
JOURNAL OF FISH BIOLOGY
Volume 86, Issue 1, Pages 392-401Publisher
WILEY
DOI: 10.1111/jfb.12567
Keywords
charr; feeding ecology; migration; predation; prey pulse; stomach contents
Categories
Funding
- Pacific Salmon Foundation
- Canada Ocean Tracking Network [Natural Sciences and Engineering Research Council (NSERC)]
- Canada Ocean Tracking Network [Canada Foundation for Innovation]
- NSERC
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Stomach contents were collected and analysed from 22 bull trout Salvelinus confluentus at the edge of the Chilko Lake and Chilko River in British Columbia, Canada, during spring outmigration of sockeye salmon Oncorhynchus nerka smolts. Twenty of the 22 (>90%) stomachs contained prey items, virtually all identifiable prey items were outmigrant O. nerka smolts and stomach contents represented a large portion (00-126%) of estimated S. confluentus mass. The results demonstrate nearly exclusive and intense feeding by S. confluentus on outmigrant smolts, and support recent telemetry observations of high disappearance rates of O. nerka smolts leaving large natural lake systems prior to entering high-order unregulated river systems.
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