Itagaki, E., Satoh, K., Yamaoka, K.-1995
Bulletin of Marine Sciences and Fisheries, Kochi University, 15: 79-91
Abstract:
Behaviors of juveniles of hatchery-reared black sea bream, Acanthopagrus schlegeli were observed under predation pressure by the yellowtail. Fish which floated increased with time under predation pressure. The floating behavior was enhanced by repeatedly putting them under predation pressure suggesting that they learned predator-induced behavior. The effect of learning continued at least for 6 hours in 40 mm TL size class. This behavior may be a quick flight from the predator in a small experimental tank. In a tank with two bricks on the bottom, released fish did not swim upwards but rested around the bricks under predation pressure. Juveniles of black sea bream may be able to change their behavior against predators in response to environmental conditions.
(Laboratory of Aquatic Ecology, Kochi University, 200-B, Monobe, Nankoku, Kochi 783, Japan)
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