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Are fish ‘rightie’ or ‘leftie’?

Researchers have identified the development of behavioural laterality or left or right-handedness and attack side preference in a scale-eating cichlid called Perissodus microlepis. The study found that as the fish grow, they develop a preference for either being a “righty” or a “lefty” based on which side of their mouth is more effective. Both “lefties” and “righties” exist in the species. “This is truly an important study because it allowed us to observe mouth direction development with age and the relationship between behavioural laterality and mouth asymmetry in these fish,” said the study.

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