Some determinants of aggressive and predatory responses in Betta splendens..

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Abstract
In an initial investigation, the frequency of threat displays by male B. splendens was positively correlated with the size of stimulus guppies, and biting attacks were negatively correlated with guppy size. In 4 subsequent experiments, these results were confirmed and extended. Satiety and food deprivation changed the frequency of biting attacks without affecting threat-display frequency. Conversely, prolonged exposure to a mirror decreased threat-display frequency without affecting biting attacks. Aggressive and predatory behaviors are relatively independent with respect to causal factors.

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