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Handling and Treatment of Male European Eels (Anguilla anguilla) for Hormonal Maturation and Sperm Cryopreservation
Published on: January 28, 2018
High hydrostatic pressure improves the swimming efficiency of European migrating silver eel
P Sébert1, D Scaion, M Belhomme
1Université Européenne de Bretagne, Université de Brest, EA4324-ORPHY, UFR Sciences et Techniques, 6 Avenue Le Gorgeu, CS 93837, 29238 Brest Cedex 3, France. Philippe.sebert@univ-brest.fr
Respiratory Physiology & Neurobiology
|October 28, 2008
Summary
European eels conserve energy during long migrations under high hydrostatic pressure. Increased pressure enhances swimming efficiency by reducing oxygen consumption, aiding their journey.
Area of Science:
- Marine Biology
- Animal Physiology
- Hydrodynamics
Background:
- European eels undertake extensive, non-feeding migrations crucial for reproduction.
- Environmental factors, including hydrostatic pressure, pose significant challenges during migration.
- Understanding energy expenditure is vital for comprehending migratory success.
Purpose of the Study:
- To investigate the impact of hydrostatic pressure on the swimming energetics of European eels.
- To determine if pressure exposure alters swimming efficiency in migrating eels.
Main Methods:
- Utilized a specialized Blazka-type swimming tunnel capable of operating under pressure.
- Measured oxygen consumption in male silver eels at various swimming speeds (0.2–1.0 body lengths per second).
- Compared measurements at atmospheric pressure versus 101 ATA hydrostatic pressure.
Main Results:
- Hydrostatic pressure significantly increased energetic swimming efficiency.
- Oxygen consumption was reduced at a given swimming speed under elevated pressure.
- This suggests pressure enhances the eels' ability to conserve energy.
Conclusions:
- Elevated hydrostatic pressure improves swimming efficiency in European eels.
- This adaptation likely allows eels to minimize energy expenditure during long migrations.
- Such findings highlight a remarkable physiological adaptation for prolonged migratory journeys.
