The scallop is one of the largest edible molluscs, and gourmets consider it to be a great delicacy. To meet this demand, the fishing industry cultivates these shellfish in coastal aquafarms. In a new analysis, behavioural ecologists have confirmed that cultivated scallops developed their own genetic structure that differs from that of natural scallops. The biologists studied a total of nine populations of scallops (Pecten maximus) along the coast of Northern Ireland.