Inversion of initial dominance relationships following the interchange of roles of resident and intruder within pairs of male swordtail fish (Xiphophorus helleri)

Abstract This experiment,consisted of 75 different pairs composed,of two male adults Xiphophorus hellerimeeting each other twice. On the first occasion, one of the fish was familiarized with the meeting,place for 3h (resident) while its opponent,was familiarized with another