Tapeta were examined of light- and dark-adapted dogfish.Scyliorhinus canicula. The tapetum in the eye of this fish is fixed; pigment processes in the tapetum do not move when a fish is changed from dark to light and vice versa. A black ventral field and a bright dorsal fundus are always present.
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J. A. C. Nicol (1961) studied this question.
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