Spanish researchers have studied the diet of three species of sharks which live in the deep waters of El Cachucho, the first Protected Marine Area in Spain, off the coast of Llanes, Asturias. The blackmouth catshark (Galeus melastomus), the velvet belly lantern shark (Etmopterus spinax), and the birdbeak dogshark (Deania calcea) feed on the resources available in their environment, according to changes taking place in the ocean depths. Their diet is opportunist, because they feed off whatever resources are available, in this case small euphausiid crustaceans, benthopelagic prawns and fish. More here