Fishing activities pose a potential threat to the southern stingray, either when caught accidentally along the east coast of the USA, or when deliberately targeted in parts of South America (1), where its flesh which is sold salted (4). The southern stingray is of considerable importance to ecotourism (4), and at well-known dive sites in the Cayman Islands, (Stingray City and the Sandbar), large numbers of southern stingrays aggregate as a result of feeding by dive operators. There are concerns that this feeding, and the high levels of interaction with humans, may be having some negative impacts on the behaviour and ecology of the stingrays (8).