Elementos paramétricos da agressão em Danio Rerio

Abstract

Aggressiveness is a set of behaviors that play a important in the adaptation and survival of individuals. The study and development of behavioral tests with Danio rerio has great relevance for several areas science, providing the scientist with a reliable instrument that monitors behaviors on a simpler scale. The objective of this work is to establish an aggression study model in Danio rerio, in which subjects are exposed to isolation, followed by agonistic interaction and to verify that the outcome of a influence the outcome of subsequent matches. To do so, we developed three experiments: I - To determine the effects of the isolation time on the aggressiveness; II - Determine the effect of the opponent's nature on the pattern of aggression and whether there is continuity in the pattern of winning / losing with various opponents; III - Determine whether there is continuity in the Win / Loss pattern with the same opponent. Our experiments show that the best isolation time to elicit the display aggressive of the fish Danio rerio is the one of 6h; the outcome of fights with new opponents naive is not influenced by the outcome of previous struggles; and the result of fights with the same opponent is entirely influenced by the outcome of the previous matches. The fact that the subject recognizes his opponent as the same opponent of the previous fight seems to be a relevant factor in the establishment and maintenance of the hierarchy, since this does not hold when the subject struggles with a new naive subject. The acknowledgment of the opponent appears to be relevant behavior for the establishment and hierarchy in the group, influencing patterns of aggression.