Prediction of oceanic electric fields in relation to fish migration

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Abstract
Several hypotheses exist in the literature suggesting the use of oceanic geoelectric fields in fish orientation, but only surface electric field values are readily available. However fishes may migrate at considerable depths. Standard electrical circuit analysis techniques were utilized to develop a two-dimensional predictive model for the geoelectric fields in ocean current systems. In six cross sections of the Gulf Stream examined as examples, total electric field intensities up to 0·46 μV/cm and current densities up to 0·0175 μA/cm2 were predicted. The electro-sensitivity of the American eel and the Atlantic salmon are within this range. Thus sufficient information is available for possible electro-orientation of at least two migratory fishes.

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