The wolf eel (Anarrhichthys ocellatus) is a species of marine ray-finned fish belonging to the family Anarhichadidae, the wolf fishes. It is found in the North Pacific Ocean. Despite its common name and resemblance, it is not a true eel. It is the only species in the monotypic genus Anarrhichthys. A. ocellatus differs from true eels, as they have paired gill slits and pectoral fins. The animal can grow up to 2.4 m (7 ft 10 in) in length and 18.4 kg (41 lb) in weight. Younger wolf eels are orange with big dark spots in the posterior part of the body. Once older they turn grey, brown greyish or dark olive. They possess powerful jaws with which they crush their prey: canine teeth in the front and molars in the posterior portion of the mouth. In the anal fin, it has no rays and 233 radials. It only has one dorsal fin, that extends from the head to the end of the body, with 228 to 250 flexible fishbones without soft radius. The caudal fin is small. It has no pelvic fins, nor a lateral line. Males have large lips and a protuberance on the superior part of the head. The lifespan of this species is about 20 years. A. ocellatus is found in caves, crevices and rocky reefs from shallow waters to a depth of 226 m (741 ft), ranging from the Sea of Japan and the Bering Sea to Northern California.
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