The red stingray is a top predator in its ocean bottom habitat, feeding mainly on crustaceans and small fish, and also taking various worms and molluscs (2) (3) (6). However, very little is known about the life history of this species. Male red stingrays are thought to reach sexual maturity at a disc width of around 35 centimetres, and females between 50 and 55 centimetres (6). Interestingly, at maturity the male and female develop markedly different teeth, with those of the female being virtually flat, and those of the male developing pointed cusps. No large differences in diet have been detected, and it is thought that the differences in the teeth are related to mating behaviour, with the male using the teeth to grip onto the female’s pectoral fins during copulation (6).
Like other stingrays, the red stingray is likely to be ovoviviparous, a method of reproduction in which the eggs develop and hatch inside the female and are born live (2) (3) (5). In most stingrays, litter size ranges from two to six young, born after a long gestation period of up to twelve months (2). However, the red stingray may have smaller litter sizes than most, reportedly giving birth to just one pup per litter (1).