Previously undocumented two-year freshwater residency of juvenile coho salmon in Prairie Creek, California.
Bell E and Duffy WG. 2007. Previously undocumented two-year freshwater residency of juvenile coho salmon in Prairie Creek, California.. American Fisheries Society. Bethesda, MD
Authors’ abstract: Over 2,000 juvenile coho salmon (Oncorynchus kisutch) were tagged with passive integrated transponder (PIT) tags during the fall of 1998 and 1999 in Prairie Creek, California, as part of a study on individual winter growth rates and movement of juvenile coho salmon. During this study, age-2 out-migrants were incidentally observed. Previously, it had been generally assumed that all juvenile coho salmon in northern California streams spend only 1 year in freshwater before out-migrating at age 1 and that a 2-year freshwater life history pattern was found only in the more northerly portions of the species’ range. Subsequently, scale analysis of PIT-tagged fish recaptured during spring out-migration was used as a basis for estimating the proportion of out-migrants displaying a 1- or 2-year freshwater residency life history. Twenty-eight percent (28%) of out-migrants captured in spring 2000 displayed a 2-year freshwater residency life history, apparently related to low winter growth rates documented in related research in the study stream.
- Type
- Published Report
- Authors
- Bell, Ethan; Duffy, Walter
- Date of Issue
- 2007-06
- Publisher
- American Fisheries Society
- Units
- REDW
- Keywords
- 1998, 1999, Life History, Oncorhynchus kisutch, out-migrants, out-migration, passive integrated transponder, PIT, scale analysis, winter growth rates