Effects of salinity and temperature acting in concert on sustained swimming speed of juvenile Coho salmon (Oncorhynchus kisutch)

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dc.contributor.authorGlova, G. J. (Gordon John)en_US
dc.date.accessioned2024-08-13T22:54:30Z
dc.date.available2024-08-13T22:54:30Z
dc.date.copyright1972en_US
dc.date.issued1972
dc.degree.departmentDepartment of Biology
dc.degree.levelMaster of Science M.Sc.en
dc.description.abstractThe effects of salinity (freshwater - 20 %) and temperature (3- 23C) acting in concert on sustained swimming speed of juvenile coho salmon (4.9-11.4 cm) acclimated to test conditions were examined in a stamina tunnel. Relations between swimming performance and test parameters were examined by response surface analysis, employing a second order polynomial as a model. Sustained swimming speed of coho fry - presmolt developmental stages declined with decreasing temperatures from about 20 C, but were little affected by salinities ranging from freshwater to 20 %S. In the smolt stage, temperature effects were similar but salinity effects more pro­nounced, with maximum levels of performance attained at near isotonic salin­ities. Optimum locomotor capacity occurred at about 20C in all develop­mental stages tested, ranging from 7.2 Lengths/second (L/sec) in fry to 5.5 L/sec in smolts. Relative swimming capacity was size dependent, and the extent of this dependence was related to temperature. With decreasing temperatures, smaller fish showed a greater decrease in relative swimming capacity. At 3C, size effects on relative capacity were virtually non­existent and all test stages attained a performance of about 3.5 L/sec. The results suggest that underyearling coho have the capacity to perform locomotor-dependent behaviours in brackish waters, up to a salinity of at least 20 %, with an efficiency equivalent to that in freshwater.en
dc.format.extent92 pages
dc.identifier.urihttps://hdl.handle.net/1828/17907
dc.rightsAvailable to the World Wide Weben_US
dc.titleEffects of salinity and temperature acting in concert on sustained swimming speed of juvenile Coho salmon (Oncorhynchus kisutch)en_US
dc.typeThesisen_US

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