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Journal of Experimental Biology 54,93-102 (1971)
Published by Company of Biologists 1971

The Central Nervous Control of Colour Change in the Minnow (Phoxinus Phoxinus L.) : II. Tectal Ablations in Normal Fish

MICHAEL J. GENTLE ¹

¹ Zoology Department, Bedford College, Regent's Park, London; Poultry Research Centre, King's Buildings, West Mains Road, Edinburgh 9

1. A series of ablations were carried out in the optic tectum of the minnow, Phoxinus phoxinus, in order to investigate its importance in colour change.

2. The presence of the anterior or posterior tectum alone one on or both sides caused persistent pallor in normal fish.

3. The presence of the anterior tectum on one side and the posterior on the other enabled the fish to adapt chromatically to its background.

4. Small bilateral removals from the dorsal part of the optic tectum did not effect colour change. Larger removals from the dorsal tectum reduced the extent of change and still larger removals caused the fish to pale on all backgrounds.

Note:

The work presented here was part of the work approved by London University for the degree of Doctor of Philosophy.