Abstract
Carangid fishes were tested in an optomotor apparatus and their orientation to different kinds of stimuli was observed. The fish did not orient to any particular region of the stimulus consisting of uniform black and white vertical stripes. The r.p.m. of the fish was generally greater than the r.p.m. of the drum. On the other hand, the fish oriented to the panel stimulus and tended to remain near it during the entire range of revolutions. The r.p.m. of the fish closely followed the r.p.m. of the drum. Certain features of the behaviour of the fish in an optomotor apparatus are compared with certain features of schooling under natural conditions.
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