Hypoxia-acclimation adjusts skeletal muscle anaerobic metabolism and burst swim performance in a marine fish
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View abstract on PubMed
Summary
This summary is machine-generated.Hypoxia acclimation in red drum (Sciaenops ocellatus) increases reliance on anaerobic metabolism, impacting energy stores and enzyme activity. This adaptation does not improve recovery from exhaustive exercise in this marine teleost.
Area Of Science
- Marine biology
- Fish physiology
- Environmental adaptation
Background
- Red drum (Sciaenops ocellatus) inhabit the Gulf of Mexico, frequently experiencing hypoxia.
- Respiratory acclimation improves aerobic performance in hypoxia, but anaerobic responses are unknown.
Purpose Of The Study
- Investigate the impact of hypoxia acclimation on red drum's anaerobic metabolism.
- Determine consequences of exhaustive exercise and recovery following hypoxia acclimation.
Main Methods
- Juvenile red drum acclimated to normoxia or hypoxia for 8 days.
- Sampling at rest, post-exercise, and post-recovery for metabolites and enzyme activity.
- Gait-transition swim test to assess exercise performance.
Main Results
- Hypoxia acclimation led to higher blood pH (pH e and pH i) during exercise.
- Red muscle ATP decreased, while lactate dehydrogenase activity increased in acclimated fish.
- White muscle ATP and hexokinase activity increased; anaerobic burst swimming initiated at lower speeds.
Conclusions
- Hypoxia acclimation shifts red drum towards greater reliance on anaerobic metabolism.
- This acclimation strategy does not enhance recovery from exhaustive exercise.
- Adaptations suggest trade-offs between aerobic and anaerobic systems under fluctuating oxygen levels.
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