interesting facts about siamese fighting fishchelonae were isolated from frozen fish destined for human consumption Mediel et al. One study investigated the effect of testosterone on female Siamese fighting fish. Females were first given testosterone, which led to physical adjustments. This blanketed fin length, body coloration and gonads. These physical adjustments resulted in the women similar to commonplace male fish. Next their aggressive behaviour was monitored. It was found that after these women folk interacted with other females, their aggression greater.