Studies of the Conditioned Reflex of Fish in Groups : II. Conditioned Reflex in Two Groups of Goldfish, Carassius auratus

概要

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Two groups of four individually recognizable yearling goldfish were conditioned to a sound (700 Hz) by means of a food-getting method (swimming into the feeding place). All fish in the first group which were previously accustomed to enter the feeding place succeeded in establishing stable positive reactions to the conditioned stimuli on the 4th day after the beginning of the experiment. On the other hand, in the second group which was not accustomed, two of the four fish established a stable conditioned reaction markedly later than the other two. In this group another fish played a lead role in swimming into the feeding place when the conditioning stimulus was applied. A separation test suggests that the seemingly conditioned reaction observed in some fish was induced by following the already conditioned fish or imitating the conditioned reaction of those fish. After the conditioning was established, fish in both groups chased and nipped the others in, and also in front of the feeding place as if they were defending the place as their territory. However, the attacks of the "dominant" fish were not so strong as to inhibit the conditioned behaviour of the "subordinate" fish.
社団法人日本動物学会の論文
1981-03-25