オヤニラミ仔稚魚の成長に伴う闘争行動の発達

概要

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Observations on the development of aggressive behavior of Japanese perch, Coreoperca kawamebari, were made over a 1-year period. Newly hatched larvae aggregated at the water surface and showed no aggressive behavior. Several days after yolk sac absorption, larvae dispersed from the water surface to the substrate and began to feed and fight. Chasing and lateral displays as seen in adult fish were firstly observed at this time, and a dominance hierarchy was evident at 50 days after hatching. Dominant individuals formed their territories after 50 days and gradually enlarged them as body size increased. The behavioral ontogeny of this fish is divisible into four phases, i. e. aggregation, dispersion, developing of aggressive behavior and territorial phases, and these correspond with four different stages of growth, namely prelarva, postlarva, juvenile and young stages, respectively.
1988-08-31