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Related Experiment Videos

Hydrostatic pressure effects on eel mitochondrial functioning and membrane fluidity.

A Vettier1, C Labbe, A Amerand

  • 1Unité Haute Pression et Métabolisme, UPCI EA3879, Brest, France.

Undersea & Hyperbaric Medicine : Journal of the Undersea and Hyperbaric Medical Society, Inc
|July 28, 2006
PubMed
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Silver eels, undergoing metamorphosis, show better pressure resistance than yellow eels. Acclimatization to high pressure equalizes aerobic metabolism and pressure sensitivity in both eel stages.

Area of Science:

  • Marine Biology
  • Environmental Physiology
  • Mitochondrial Physiology

Background:

  • Eel spawning migration involves long-distance swimming at depth, requiring aerobic metabolism.
  • Aerobic metabolism, particularly the mitochondrial respiratory chain and oxidative phosphorylation, is sensitive to hydrostatic pressure.
  • Eels can acclimatize to pressure by adjusting membrane fluidity, but studies focused on the premigratory yellow stage.

Purpose of the Study:

  • To investigate if metamorphosis (silvering) preadapts eels to hydrostatic pressure.
  • To compare pressure sensitivity and aerobic metabolism between yellow and silver eels.
  • To understand the role of membrane fluidity in pressure acclimatization during eel metamorphosis.

Main Methods:

  • Comparison of pressure sensitivity and aerobic metabolism between yellow and silver eels at 0.1 MPa.

Related Experiment Videos

  • Exposure of yellow eels to high pressure (10.1 MPa) for 21 days to assess acclimatization.
  • Analysis of membrane fluidity and polyunsaturated fatty acid proportions in both eel stages.

    • Main Results:

    • Yellow eels exhibited higher pressure sensitivity than silver eels at ambient pressure.
    • A 21-day acclimatization period at 10.1 MPa eliminated differences in pressure sensitivity and aerobic metabolism between the stages.
    • Silver eels displayed higher membrane fluidity and polyunsaturated fatty acid content at 0.1 MPa compared to yellow eels.

    Conclusions:

    • Metamorphosis enhances membrane fluidity, preadapting silver eels to cope with hydrostatic pressure.
    • Silver eels can tolerate high pressure without energy-intensive acclimatization processes observed in yellow eels.
    • Improved membrane properties during silvering are key to pressure resistance during deep-sea migration.