Effects of temperature and ration on the otolith-to-somatic size relationship in juvenile Chinook salmon (Oncorhynchus tshawytscha): a test of the direct proportionality assumption

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dc.contributor.authorStormer, David G.
dc.contributor.authorJuanes, Francis
dc.date.accessioned2021-06-25T14:23:10Z
dc.date.available2021-06-25T14:23:10Z
dc.date.copyright2016en_US
dc.date.issued2016
dc.description.abstractFish otoliths are commonly used to estimate somatic growth rate, but this depends on the assumption that the otolith and body grow in direct proportion. Environmental conditions contribute to variability in somatic growth and can result in deviations from direct proportionality in the otolith-to-somatic size relationship. In the present study we examined the otolith-to-body size relationship for juvenile Chinook salmon (Oncorhynchus tshawytscha) subjected to simulated seasonal (summer, autumn and winter) water temperatures and feeding rations. The otolith-to-somatic size relationship became uncoupled during summer between fish subjected to the cool (158C) and hot (218C) water temperatures. A food ration effect was also observed during the summer, such that fish fed an unlimited ration had smaller otoliths than equivalently sized fish fed a limited ration. The effects of water temperature and ration disappeared by the end of autumn, indicating that a seasonal compensatory response occurred in the otolith-to-somatic size relationship after the extreme temperatures and food limitations were alleviated. In winter, this relationship became uncoupled again, but only between fish that were fed throughout the winter and fish that were starved during the 3-month experimental period. The effects of water temperature and rations on the otolith-to-somatic size relationship of juvenile Chinook salmon could have implications for accurately estimating somatic growth from otolith growth in natural populations and should be incorporated into back-calculation techniques. en_US
dc.description.reviewstatusRevieweden_US
dc.description.scholarlevelFacultyen_US
dc.description.sponsorshipThis paper was presented at the 5th International Otolith Symposium in Mallorca, Spain, October 2014. Funding of the experiment was provided by the Natural Sciences and Engineering Research Council of Canada (NSERC), the University of Victoria (UVic) and the Liber Ero Foundation. The authors are grateful to the staff of the UVic aquatic research facility for their assistance in maintaining the experimental conditions. Invaluable assistance in fish processing and otolith measurements was provided by UVic students Kelcy Tousignant and Paige Borrett.en_US
dc.identifier.citationJuanes, F., & Stormer, D.G. (2016). Effects of temperature and ration on the otolith-to-somatic size relationship in juvenile Chinook salmon (Oncorhynchus tshawytscha): a test of the direct proportionality assumption. Marine and Freshwater Research, 67. https://doi.org/10.1071/MF15206en_US
dc.identifier.urihttps://doi.org/10.1071/MF15206
dc.identifier.urihttp://hdl.handle.net/1828/13057
dc.language.isoenen_US
dc.publisherMarine and Freshwater Researchen_US
dc.subjectback-calculation
dc.subjectfood ratioj
dc.subjectwater temperature
dc.subject.departmentDepartment of Biology
dc.titleEffects of temperature and ration on the otolith-to-somatic size relationship in juvenile Chinook salmon (Oncorhynchus tshawytscha): a test of the direct proportionality assumptionen_US
dc.typeArticleen_US

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