alfonsino, any of the eight species of exclusively marine fishes constituting the family Berycidae (order Beryciformes). The family contains two genera, Beryx and Centroberyx. Representatives occur in deep-sea habitats of the Atlantic, Pacific, and Indian oceans.
B. splendens of the North Atlantic is an edible, deepwater species that reaches a length of 60 centimetres (2 feet). It is spectacularly coloured, the lower half being silvery and the upper portions and fins bright scarlet.