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Journal of Experimental Biology 57,701-707 (1972)
Published by Company of Biologists 1972

The Eye and Colour Change in the Minnow (Phoxinus Phoxinus L)

MICHAEL J. GENTLE ¹

¹ Zoology Department, Bedford College Regent's Park, London; Poultry Research Centre, King's Buildings, West Mains Road, Edinburgh, EH9 3JS

1. Counts were made of the retinal receptors and observations were made of the colour of the minnow, Phoxinus phoxinus L., following the surgical removal of parts of the dorsal and ventral retina.

2. It was found that there were greater numbers of retinal receptors in the temporal field than in the rostral field of the eye.

3. There were very few triple and quadruple cones but a large number of double and single cones in the ventral retina compared to the dorsal.

4. Surgical removal of the dorsal retina or only part of it resulted in the fish being fully dark-adapted on a black or white background.

5. Surgical removal of the ventral retina resulted in the fish assuming an intermediate colour on a white background and a darker tint on a black background.