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

Routine oxygen consumption [Mo 2 ) was 35% higher in 1 day starved and 21% higher in 4 day starved adult transgenic coho salmon Oncrhynchus kisutch relative to end of migration ocean-ranched coho salmon. Critical swimming speed (U crit ) and Mo 2 at U crit (Mo 2max ) were significantly lower in 4 day starved transgenic coho salmon (1.25BL s -1 ;8.79 mg O 2 kg -1 min -1 ) compared to ocean-ranched coho salmon (1.60BL s -1 ; 9.87mgO 2 kg -1 min -1 ). Transgenic fish swam energetically less efficiently than ocean-ranched fish, as indicated by a poorer swimming economy at U crit (Mo 2max U -1 crit ). Although Mo 2max was lower in transgenic coho salmon, the excess post-exercise oxygen consumption (EPOC) measured during the first 20min of recovery was significantly larger in transgenic coho salmon (44.1 mgO 2 kg -1 ) compared with ocean-ranched coho salmon (34.2mg O 2 kg -1 ). which had a faster rate of recovery.

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