Patagonian toothfish

Marine fish with regularly ossified skeleton. Robust body with rounded contour, slightly compressed and covered with small scales. Big head with pointed snout. Terminal mouth with inferior prognathism. Side and large eyes. A single nostril on each side, located near the eye. Two dorsal fins, the first consisting of hard radii, triangular in shape by the relative size of the spokes and the second with soft radii, with a longer base than the first and uniform height. Flow truncated. Anal base smaller than the second dorsal and of similar height. The pectorals begin below the sharpened end of the operculum, in the midline of the flanks, with a high base and rounded shape, the length varies according to the size of the individual, relatively longer in the youngest. The ventral are short, they begin in front of the bases of the pectorals. Coloration: dark gray on the back and flanks, clearing in the ventral zone. Spiny portion of dorsal bordered dark gray.