Learning Effect on Predator Avoidance in Hatchery-reared Juveniles of the Red Sea Bream, Pagrus major.

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Learning effect on predator avoidance was examined in a tank where hatchery-reared juveniles of red sea bream <I>Pagrus major</I> were exposed to the predation of the devil stinger, <I>Inimicus japonicus</I>. The growth of the learner may weaken the effect in this case. Younger, or smaller (56 mm in mean total length) juveniles were observed to apparently resist the predation pressure, when they had experienced even once such predation pressure. Interesting evidence suggests that the learning effect may be kept there at least for 24 hours. On the other hand, larger (81-100 mm in mean total length) fish had not exercise such learning ability as do the younger group of fish. As far as our observation goes, the availability of red sea bream seeds should be improved by exposing them to any rate of predation pressure in prior to stock them in environment with mortal danger of predators.
日本水産増殖学会の論文