Swimming performance, oxygen consumption and excess post-exercise oxygen consumption in adult transgenic and ocean-ranched coho salmon |
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Authors: | C. G. Lee,R. H. Devlin&dagger , A. P. Farrell&Dagger |
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Affiliation: | Biological Sciences, Simon Fraser University, Burnaby, B.C., V5A 1S6, Canada;and Fisheries and Oceans Canada, 4160 Marine Drive, West Vancouver, B.C., V7V 1N6, Canada |
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Abstract: | Routine oxygen consumption ( M o 2) was 35% higher in 1 day starved and 21% higher in 4 day starved adult transgenic coho salmon Oncorhynchus kisutch relative to end of migration ocean-ranched coho salmon. Critical swimming speed ( U crit) and M o 2 at U crit ( M o 2max) were significantly lower in 4 day starved transgenic coho salmon (1·25 BL s−1; 8·79 mg O2 kg−1 min−1) compared to ocean-ranched coho salmon (1·60 BL s−1; 9·87 mg O2 kg−1 min−1). Transgenic fish swam energetically less efficiently than ocean-ranched fish, as indicated by a poorer swimming economy at U crit ( M o 2max ). Although M o 2max was lower in transgenic coho salmon, the excess post-exercise oxygen consumption (EPOC) measured during the first 20 min of recovery was significantly larger in transgenic coho salmon (44·1 mg O2 kg−1) compared with ocean-ranched coho salmon (34·2 mg O2 kg−1), which had a faster rate of recovery. |
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Keywords: | EPOC growth hormone oxygen consumption salmon transgenic U crit |
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