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Levels Of Stored Energy But Not Marine Foraging Patterns Differentiate Seasonal Ecotypes Of Wild And Hatchery Steelhead Trout, Oncorhynchus Mykiss, Returning To The Kalama River, Washington
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2016
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Source: Canadian Journal of Fisheries and Aquatic Sciences 74(2): 157-167
[PDF-1.10 MB]
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Journal Title:Canadian Journal of Fisheries and Aquatic Sciences
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Description:Anadromous fishes need to store sufficient energy at sea to migrate and reproduce, but the energetic demands of freshwater migration distance have been difficult to distinguish from the demands of fasting in fresh water prior to spawning. In addition, differences in stored energy may result from differences in metabolic storage or marine diet. We estimated somatic lipids (SL) and stable isotopes of N and C (as indices of marine trophic position and feeding location) in adult wild and hatchery steelhead (Oncorhynchus mykiss) of summer (stream-maturing) and winter (ocean-maturing) runs that migrate similar distances to spawn. We found that SL at return depended on several factors. Summer steelhead had twice the SL as winter steelhead, and within each run SL decreased with arrival date, converging on about 1% SL. In summer steelhead, females had 19% more SL than males, and wild fish had 21% more SL than hatchery fish. In winter steelhead, females had 27% less SL than males, and there was no difference between rearing origins. No differences were detected in δ15N or δ13C between ecotypes or rearing origins. Taken together, the results indicated different patterns of energy storage among and within ecotypes despite no apparent differences in marine trophic position or foraging area.
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Source:Canadian Journal of Fisheries and Aquatic Sciences 74(2): 157-167
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Sea Grant Document Number:WASHU-R-17-007
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