splendens was in comparison using a mix of mirror and video playbacks tests and live conspecific presentations . The authors showed that outcomes were context based, with adjustments in aggression among wild type and short finned domesticated forms effects from a fighter and fancy short finned variety where pooled together to increase sample size detected during live conspecific trials but not when using mirror/video playback tests. Further, the same fighter and wild type traces showed variations in male cortisol reaction to unfamiliar environments, with wild types, but not warring parties expanding cortisol levels . Taken in combination, the effects from these reports suggest that selection for winning has changed aggressive behaviour and physiological responses in B. splendens. We compared the behaviour of a wild type and a fighter strain of B.