The effects of an acute temperature change on the metabolic recovery from exhaustive exercise in luvenile Atlantic salmon (Salmo salar).
This research examined the influence of acute changes of water temperature on the recovery processes following exhaustive exercise in juvenile Atlantic salmon (Salmo salar). White muscle phosphocreatine (PCr), ATP, lactate, glycogen, glucose, pyruvate, plasma lactate, and plasma osmolality were measured during rest and at 0, 1, 2, and 4 h following exhaustive exercise in fish acclimated and exercised at 12 degrees C and acutely exposed to either 6 degrees C or 18 degrees C water during recovery. An acute exposure to 6 degrees C water during the recovery period resulted in a severe reduction of metabolic recovery in salmon. However, metabolites such as muscle PCr and ATP and plasma lactate recovered very quickly (2-4 h) in fish acutely exposed to 18 degrees C during recovery. Overall, differences exist when postexercise metabolite levels are compared between acclimated fish and those fish acutely exposed to different water temperatures (either higher or lower). Taken together, the findings of the acute experiments suggest that at some point following exercise fish may seek warmer environments to speed the recovery process. However, the relationship between behavioural thermoregulation and recovery following exhaustive exercise in fish is not well understood.
Galloway
Brendan J
BJ
Department of Biology and Centre for Coastal Studies and Aquaculture, University of New Brunswick, Saint John, New Brunswick E2L 4L5, Canada.
Kieffer
James D
JD
D000704:Analysis of Variance; D000818:Animals; D019344:Lactic Acid / Q000097:blood; D018763:Muscle Fatigue / Q000502:physiology*; D018482:Muscle, Skeletal / Q000378:metabolism*; D009994:Osmolar Concentration; D005082:Physical Exertion / Q000502:physiology*; D020317:Salmo salar / Q000097:blood / Q000502:physiology*; D013696:Temperature
D019344:Lactic Acid