Two Male Cichlids Sparring (IMAGE) Stanford University Caption Two male cichlids spar with each other by showing what big mouths they have. When two fish fight, all their movements are at least slightly out of sync. But when the foe is a fish’s mirror image, the "opponent’s" actions are perfectly in time, which seems to trigger an element of fear. Credit Todd Anderson/Stanford University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.