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Juvenile sturgeon exhibit reduced physiological responses to exercise
J D Kieffer1, A M Wakefield, M K Litvak
1Department of Biology and Centre for Coastal Studies and Aquaculture, University of New Brunswick, PO Box 5050, Saint John, New Brunswick, Canada E2L 4L5. jkieffer@unbsj.ca
The Journal of Experimental Biology
|January 30, 2002
Summary
Atlantic sturgeon and shortnose sturgeon show unique physiological responses to exhaustive exercise. Their oxygen consumption and ammonia excretion increase, but recovery patterns differ from other fish species.
Area of Science:
- Comparative physiology
- Fish biology
- Exercise physiology
Background:
- Atlantic sturgeon (Acipenser oxyrhynchus) and shortnose sturgeon (A. brevirostrum) are ecologically important species.
- Understanding their physiological responses to stress, such as exhaustive exercise, is crucial for conservation and management.
Purpose of the Study:
- To investigate the physiological and metabolic responses to exhaustive exercise in Atlantic and shortnose sturgeon.
- To compare these responses with those of other fish species, particularly teleosts like rainbow trout.
Main Methods:
- Measured oxygen consumption and ammonia excretion rates in both species post-exercise.
- Analyzed muscle and blood physiological parameters (lactate, glycogen, osmolality, etc.) in juvenile shortnose sturgeon.
- Monitored physiological parameters over a 4-hour recovery period.
Main Results:
- Both species exhibited a twofold increase in oxygen consumption and ammonia excretion post-exercise.
- Oxygen consumption returned to baseline within 30 minutes; ammonia excretion remained elevated in Atlantic sturgeon.
- Shortnose sturgeon showed minimal changes in muscle energy metabolites and rapid lactate clearance compared to teleost fish.
Conclusions:
- Atlantic and shortnose sturgeon display atypical physiological responses to exhaustive exercise compared to other fish.
- These sturgeon may possess unique behavioral or endocrinological mechanisms that modulate their response to strenuous activity.
- Further research is needed to elucidate these distinct physiological adaptations.