Abstract
16 pairs of adult male Betta splendens were tested for waning of threat displays during 124 hrs of exposure to either conspecifics or to 1-way mirrors. In the 1-way mirror condition, 8 Ss viewed their own mirror images while their respective pair members viewed them through the transparent, nonreflective sides of the 1-way mirrors. Mirror viewers displayed much more persistently than fish that viewed them through the 1-way mirrors, and somewhat more than conspecifics that viewed each other through clear partitions. When the visually preexposed pairs were later permitted to fight, viewing mirrors or other conspecifics prior to combat had not reduced attack readiness. In fact, visually isolated control pairs fought less than visually preexposed Ss; subsequent visual exposure to opponents reversed the effects of visual isolation. Results suggest that threat and attack components of aggression may vary independently of each other.
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