Abstract
We observed 10 categories of behaviour in 133 ayu, Plecoglossus altivelis, kept individually in isolated aquaria, and separated three individuality components, aggressiveness, activity, and slow reaction, by factor analysis. We then divided 84 of the fish into 14 groups, each comprising 6 individuals, and released each group into one of four ponds designed to simulate natural streams for a 10-day period to investigate their territory formation and growth rates. Individuals that showed aggression towards an ayu model in the aquaria tended to engage in many aggressive interactions with other individuals in the ponds. Large and active individuals from the aquaria were dominant over other individuals in the ponds. The increase in aggressive interactions and percentage of encounters won increased the territorial period of individual fish. Growth rate was significantly correlated with territorial period, indicating that individual differences were important in social organization and individual foraging success.
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