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Oceanic electric fields: perception by american eels?

S A Rommel, J D McCleave

    Science (New York, N.Y.)
    |June 16, 1972
    PubMed
    Summary
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    American eels demonstrate remarkable sensitivity to weak electric fields, using geoelectric cues for navigation. This finding reveals their potential for utilizing Earth's natural electrical signals during long-distance migrations.

    Area of Science:

    • Ichthyology
    • Animal Behavior
    • Bioelectricity

    Background:

    • American eels undertake extensive migrations.
    • Fish can detect and respond to electric fields.
    • Geoelectric fields are naturally occurring phenomena.

    Purpose of the Study:

    • To investigate the sensitivity of American eels to geoelectric fields.
    • To determine if eels can use electric fields for orientation.

    Main Methods:

    • Eels were exposed to controlled electric fields of varying intensities and salinities.
    • Cardiac deceleration was measured as a response indicator.
    • Different water resistivities and current densities were tested.

    Main Results:

    Related Experiment Videos

    • Eels showed conditioned cardiac deceleration to electric fields as low as 0.167 x 10(-2) microampere/cm².
    • Responses were reduced in higher salinity water and at lower current densities.
    • Eels exhibited sensitivity in both freshwater and lower salinity conditions.

    Conclusions:

    • American eels possess the sensory capability to detect and potentially utilize geoelectric fields.
    • This sensitivity suggests a role for geoelectric cues in eel navigation and orientation.
    • The findings contribute to understanding electroreception in migratory fish.