dogfish

/dawg"fish', dog"-/, n., pl. (esp. collectively) dogfish, (esp. referring to two or more kinds or species) dogfishes.

1. any of several small sharks, esp. of the genera Mustelus and Squalus, that are destructive to food fishes.

2. any of various other fishes, as the bowfin.

[1425-75; earlier dokefyche; late ME. See DOG, FISH]

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Any of several species of small sharks.

The spiny dogfish (Squalus acanthias, family Squalidae) has a sharp spine in front of each of its two dorsal fins. It is abundant along northern Atlantic and Pacific coasts. It is gray with white spots, about 2–4 ft (60–120 cm) long, and often found in schools. It preys on fishes and invertebrates and often steals bait and damages fishing nets. It yields liver oil or is ground for fertilizer. Other well-known species are the spotted dogfishes (family Scyliorhinidae), which are sold as food, and the smooth hound or smooth dogfish (Mustelus canis, family Triakidae), one of the most common sharks on the U.S. Atlantic coast. See also bowfin.

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▪ shark group

 any of several small sharks of the families Squalidae, Scyliorhinidae, and Triakidae. In North America, the name is also used for a freshwater fish, the bowfin (q.v.).

      The spiny dogfishes of the family Squalidae possess a sharp spine in front of each of their two dorsal fins. The most widely known species is Squalus acanthias, called the spiny dogfish, spurdog, or skittle dog. It is abundant along northern Atlantic and Pacific coasts; a closely related, if not identical, form inhabits the southern half of the world. The spiny dogfish is gray, with white spots, and is about 60 to 120 cm (2 to 4 feet) long. Often found in dense schools, it preys on fishes and various invertebrates. It is often a nuisance, as it takes baits and damages fishing nets, but it is edible and also yields liver oil and is ground for fertilizer. Its dorsal fin spines are associated with small venom glands and can cause painful wounds.

      The spotted dogfishes of the family Scyliorhinidae include the larger spotted dogfish, or nursehound (Scyliorhinus stellarius), which grows to about 150 cm long, and the lesser spotted dogfish (S. cuniculus), which is about 90 cm long. Both of these common, brown-spotted sharks are caught and sold as food.

      The smooth hound, or smooth dogfish (Mustelus canis), is one of the best-known members of the family Triakidae. It is also one of the most common sharks on the American Atlantic coast. It is a slim shark, up to 150 cm long, and is grayish in colour. Like others of its family, it has small teeth, arranged in series, and lacks a well-developed lower tail lobe. It is a bottom dweller and preys on fish and crustaceans.

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