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Juvenile sturgeon exhibit reduced physiological responses to exercise

James D. Kieffer^*, Andrea M. Wakefield and Matthew K. Litvak

Department of Biology and Centre for Coastal Studies and Aquaculture, University of New Brunswick, PO Box 5050, Saint John, New Brunswick, Canada E2L 4L5

View larger version (18K): [in a new window]   Fig. 1. Rates of oxygen consumption (O2; A) and net ammonia excretion (B) prior to and following exhaustive exercise in shortnose and Atlantic sturgeon. Asterisks denote significant differences (P<0.05) from resting values (C), and a dagger indicates a significant difference (P<0.05) between shortnose and Atlantic sturgeon at a particular sampling time. Negative values indicate net ammonia losses from the fish (net efflux). Values are means ± S.E.M. (N=8, for each species for O2; N=6 for each species for ammonia excretion).

View larger version (15K): [in a new window]   Fig. 2. Phosphocreatine (PCr; A) and glycogen (B) concentrations (µmol g–1) in the muscle of shortnose sturgeon at rest (C) and following 0, 1, 2 and 6 h of recovery after exhaustive exercise. An asterisk denotes a significant difference (P<0.05) from the resting value. Values are means + S.E.M. (N=7–11).

View larger version (14K): [in a new window]   Fig. 3. Lactate (A), pyruvate (B) and glucose (C) concentrations (µmol g–1) in the muscle of shortnose sturgeon at rest (C) and following 0, 1, 2 and 6 h of recovery after exhaustive exercise. An asterisk denotes a significant difference (P<0.05) from resting values. Values are means + S.E.M. (N=7–11).

View larger version (13K): [in a new window]   Fig. 4. Lactate concentration (mmol l–1) (A) and osmolality (mosmol kg–1) (B) in the plasma of shortnose sturgeon at rest (C) and following 0, 2 and 6 h of recovery after exhaustive exercise. An asterisk denotes a significant difference (P<0.05) from the resting value. Values are means + S.E.M. (N=5–7).