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Evidence for selective mortality in marine environments: the role of fish migration size, timing, and production type

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Title Evidence for selective mortality in marine environments: the role of fish migration size, timing, and production type
Names Claiborne, Andrew M. (creator)
Miller, Jessica A. (creator)
Weitkamp, Laurie A. (creator)
Teel, David J. (creator)
Emmett, Robert L. (creator)
Date Issued 2014-11-18 (iso8601)
Note To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by Inter-Research and can be found at: http://www.int-res.com/journals/meps/meps-home/.
Abstract The underlying causes of mortality during critical life stages of fish are not well
understood, nor is it clear if these causes are similar for naturally versus artificially propagated (i.e.
hatchery) individuals. To assess the importance of selective mortality related to production type
(hatchery vs. naturally produced) and size at and timing of marine entry, we compared attributes
of juvenile Chinook salmon Oncorhynchus tshawytscha from the upper Columbia River summer- and
fall-run genetic stock group captured in the Columbia River estuary with back-calculated
attributes of survivors captured in marine waters. We used genetic stock identification, otolith
chemistry and structure, and physical tags to determine stock of origin, size at and timing of marine
entry, and production type. Fish emigrated from fresh water in May to September and the
majority of fish collected in the estuary (87%) had arrived within 3 d of capture. In 1 of 2 yr, timing
of marine entry for both production types differed between the estuary and ocean: the ocean catch
included a greater proportion of juveniles that emigrated in late July than the estuary catch. There
was no evidence of selective mortality of smaller juveniles during early marine residence in
hatchery or natural juveniles, but the mean percentage (±SE) of hatchery fish in ocean collections
was 16 ± 5.8% less than in the estuary, which could indicate reduced survival compared to
naturally produced fish. Results from this study highlight the need to understand the effects of
hatchery rearing and how hatchery propagation may influence survival during later critical
life-history transitions.
Genre Article
Topic Chinook salmon
Identifier Claiborne, A. M., Miller, J. A., Weitkamp, L. A., Teel, D. J., & Emmett, R. L. (2014). Evidence for selective mortality in marine environments: the role of fish migration size, timing, and production type. Marine Ecology Progress Series, 515, 187-202. doi:10.3354/meps10963

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