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Individual condition, standard metabolic rate, and rearing temperature influence steelhead and rainbow trout (Oncorhynchus mykiss) life histories Public Deposited

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https://ir.library.oregonstate.edu/concern/articles/d217qr26x

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  • We reared juvenile Oncorhychus mykiss with low and high standard metabolic rates (SMR) under alternative thermal regimes to determine how these proximate factors influence life histories in a partially migratory salmonid fish. High SMR significantly decreased rates of freshwater maturation and increased rates of smoltification in females, but not males, after 1 year of rearing. Warmer water temperatures significantly decreased rates of freshwater maturation and increased rates of smoltification in both sexes. Variation in individual growth influenced the probability of adopting anadromy or freshwater residency as life histories, but produced paradoxical results. Individuals with the highest growth performance within their respective temperature treatments had a higher probability of freshwater maturation, but warmer temperatures decreased freshwater maturation despite significantly increasing somatic growth. Whole-body lipid content was significantly lower for fish reared in the warm temperature treatment, which may explain the decreased probability of freshwater maturation for individuals exposed to warmer temperatures. Our results indicate that changes in somatic growth induced by altered thermal regimes can influence the relationship between body size and the probability of maturation. Accordingly, somatic growth may not be a robust predictor of shifts in the prevalence of anadromy and residency in partially migratory salmonids when compared across thermal regimes.
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  • Sloat, M. R., & Reeves, G. H. (2014). Individual condition, standard metabolic rate, and rearing temperature influence steelhead and rainbow trout (Oncorhynchus mykiss) life histories. Canadian Journal of Fisheries and Aquatic Sciences, 71(4), 491-501. doi:10.1139/cjfas-2013-0366
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  • 71
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  • 4
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  • Funding for this work was provided by the USDA Forest Service, Pacific Northwest Research Station, Corvallis, Oregon, National Marine Fisheries Service, Northwest Fisheries Science Center, Washington, and the Oregon Chapter of the American Fisheries Society Carl Bond Memorial Scholarship.
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  • description.provenance : Approved for entry into archive by Erin Clark(erin.clark@oregonstate.edu) on 2014-05-08T19:15:00Z (GMT) No. of bitstreams: 1 SloatMatthewFisheriesWildlifeIndividualConditionStandard.pdf: 1071091 bytes, checksum: 5036fc3c29b09ea048c16061c7ef77eb (MD5)
  • description.provenance : Made available in DSpace on 2014-05-08T19:15:00Z (GMT). No. of bitstreams: 1 SloatMatthewFisheriesWildlifeIndividualConditionStandard.pdf: 1071091 bytes, checksum: 5036fc3c29b09ea048c16061c7ef77eb (MD5) Previous issue date: 2014-04
  • description.provenance : Submitted by Erin Clark (erin.clark@oregonstate.edu) on 2014-05-08T19:14:37Z No. of bitstreams: 1 SloatMatthewFisheriesWildlifeIndividualConditionStandard.pdf: 1071091 bytes, checksum: 5036fc3c29b09ea048c16061c7ef77eb (MD5)

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