Trophic biology contributions of the slender-spined catfish Arius platypogon (Gunther, 1864), in San Ignacio Lagoon, Baja California Sur, Mexico

One hundred two stomachs of the slender-spined catfish Arius platypogon were analyzed. The organisms were captured in San Ignacio Lagoon, Baja California Sur, Mexico, during two sampling periods (May and August 1992). The number of food components found was relatively large (23), however a few species were dominant. The slender-spined catfish has a preference for crustaceans, mainly the crab Callinectes bellicosus and the shrimp Penaeus californiensis. The diet breadth, determined with Levin's index, was low for both periods showing that A. platypogon can be considered a specialist predator.