Aggressiveness-related behavioural types in the pearly razorfish [dataset]

This data set is supplementary material for the article "Types of behaviour related to aggressiveness in pearlescent fish". Animal personality has a very relevant implication in a multitude of eco-evolutionary processes. It is a topic very approached in freshwater fish, not so in marine species, because its captivity is a challenge to reproduce its natural habitat. this is the first evidence of behavioural traits in the pearly razorfish. For this, we designed experiments in the laboratory, where the experimental individuals were subjected to the mirror test—a widely used test to determine each individual's aggressiveness. By not recognizing their reflection in the mirror, fish perceive their reflection as the intrusion of another individual into their territory. Thanks to these experiments, we were able to determine each individual's aggressiveness score, finding significant differences between individuals. Differences found regardless of height, sex or individual condition. These findings suggest that this species' aggressiveness may have a genetic origin, as has been demonstrated in other species.