Abstract
The question is, if intraspecific aggressive behaviour can be understood as a drive. If Xiphophorus helleri ♂♂ are kept in social isolation for 7–56 days, the fights for rank order position showed an increasing duration and intensity (S-curving, ramming, circling and mouth-fighting are registered by an event-recorder. These results are in contrast to the results on cichlids and anabantids. The results can be explained by the idea of a spontaneous accumulation of attack readiness or as recovery from habituation. It is supposed that the different influence of social isolation on aggressive behavior corresponds to different types of social organization and ecological adaptations.
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