Abstract
Light-dependent motor activity and phototactic behavior was investigated in 1) untreated, 2) blinded, and 3) blinded and pinealectomized eels (Anguilla anguilla L.). Neither blinding nor blinding combined with pinealectomy interfered with the observed nocturnal motor activity or the photonegative behavior characteristic for the untreated animals. However, an aluminum foil covering the skull of blinded animals altered the light-dependent motor activity pattern in contrast to blinded animals bearing a transparent plastic foil cover. Blinded animals with an aluminum foil covering the brain case exhibited a motor activity pattern resembling arrhythmicity.
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