Just out of curiosity, I’ve been doing some research on green wolf “eels” and have found a lot of conflicting information about their tank requirements. Picture courtesy Outdoor Writers Association of California. Species: Anarrhichthys ocellatus (Ayres, 1855); from the Greek word anar-hichas (an ancient name for a fish which resembled this species) and the Latin word ocellatus (eye-like spots).. Alternate Names: Moray eel. The Wolf Eel mates for life and prefers to spend its time in tight caves and crevices. However, it is a pseudochromid (Dottyback). The wolf is the largest extant member of Canidae, males averaging 40 kg (88 lb) and females 37 kg (82 lb). The wolf (Canis lupus), also known as the gray wolf or grey wolf, is a large canine native to Eurasia and North America.More than thirty subspecies of Canis lupus have been recognized, and gray wolves, as colloquially understood, comprise non-domestic/feral subspecies. Despite its name, the Wolf Eel is actually a fish. In fact, I highly recommend this fish be kept with other larger aggressive fish that cannot fit into its cavernous mouth; however, wolf eels generally do best in a species-only tank. Liveaquaria suggests a minimum tank size of 125 gallons, while many other sources suggest a minimum of 50. Called doctorfish in Alaska, lo’l, lo’ox, or st’aaxaam in British Columbia. A moray eel is a true eel (family Muraenidae), whereas a wolf eel is a member of the wolffish family (family Anarhichadidae). The wolf eel blenny has a temperament and size that would prohibit keeping it in most reef tanks. Young wolf eel are often orangish with dark areas merging into stripes at the rear of the body. It was given this name because of its powerful jaws and sharp teeth that it uses to crush hard-shelled creatures, such as crabs and abalone. Wolf fishes: Family Anarhichadidae. The maximum lifespan of a wolf eel is not known. Wolf-eels are believed to mate for life and a pair will occupy the same den year after year and possibly their entire life unless they are forced out by a larger wolf-eel or a Giant Pacific Octopus. Wolf can grow up to 240 cm (7.87 ft) in length, and 18.4 kg (40.5 lbs) in weight. Age at maturity occurs at 4 to 7 years, suggesting these may be long-lived fish. Rather the Wolf Eel is related to wolffishes, a group of bottom-dwelling carnivores that hide on the rocky ocean bottom. Identifying features: Sometimes referred to as the “Ugly old man of the sea,” the Wolf Eel has a bulbous head with a strong jaw and sharp teeth. Donna Kalez, general manager of Dana Wharf Sportfishing, said Wright caught his wolf eel on a sardine at a depth of nearly 300 feet. The adult Wolf Eel ranges from light brown to dark gray in colour, with a long, dot-covered body. They begin pairing up at 4 years of age and reproduce at around 7 years. 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