Abstract

1. The retina of bluefish, Pomatomus saltatrix, undergoes photomechanical changes in response to light and darkness. Complete light-adaption requires between 15 and 30 minutes, complete dark-adaption between 30 and 60 minutes.2. Retinal cones of juvenile bluefish held under continuous darkness for two days exhibited a diurnal retinomotor rhythm. The epithelial pigment layer remained in a dark-adapted condition throughout the two days and displayed no discernible expansion.3. Results were related with activity rhythms of bluefish and suggested that internal control of a retinomotor rhythm may predispose the eye to environmental changes in light intensity.

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