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Biol Bull 135: 530-536. (December 1968)
© 1968 Marine Biological Laboratory
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RHYTHMIC MOVEMENTS OF CONES IN THE RETINA OF BLUEFISH, POMATOMUS SALTATRIX, HELD IN CONSTANT DARKNESS

BORI L. OLLA 1 and WARREN W. MARCHIONI 1

1 U. S. Bureau of Sport Fisheries and Wildlife, Sandy Hook Marine Laboratory, Highlands, New Jersey 07732

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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Copyright © 1968 by the Marine Biological Laboratory.