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Swimming performance, oxygen consumption and excess post-exercise oxygen consumption in adult transgenic and ocean-ranched coho salmon

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Routine oxygen consumption (Mo2) 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 (Ucrit) and Mo2 at Ucrit (Mo2max) 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 Ucrit (Mo2max ). Although Mo2max 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; Ucrit; growth hormone; oxygen consumption; salmon; transgenic

Document Type: Regular Paper

Affiliations: 1: Biological Sciences, Simon Fraser University, Burnaby, B.C., V5A 1S6, Canada 2: Fisheries and Oceans Canada, 4160 Marine Drive, West Vancouver, B.C., V7V 1N6, Canada

Publication date: 2003-04-01

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