Wednesday, March 20, 2013

Dogfish

Life of Sea | Dogfish  | Dogfish, name for a number of small sharks of different families. Best known are the spiny dogfishes (family Squalidae) and smooth dogfishes (family Triakidae). Barbed Dogfishes have two spines, one in front of each dorsal fin and anal fins lack. The common spiny or piked, dogfish (Squalus acanthus) is found in the oceans of the world and are very abundant in the shallow, temperate waters. Gray skin is speckled white. Females of this species can reach lengths of 4 ft. (120 cm) and weighing 15 to 20 lb (6.3 to 9 kg), smaller males.
Thorn in species contain toxins that can cause a very painful wound. Dogfishes barbed migrate seasonally, preferring water in a certain temperature range. They eat a variety of fish and invertebrates and cause great damage to commercially valuable fish populations. In Europe they are fishing for food. Other members of the family of spiny dogfish are found in deep water. The smooth dogfish (Mustelis canis) found on the Atlantic coast of America from Brazil to Cape Cod.
It is gray and grow to a length of about 5 feet (150 cm). There is no commercial value, migrate seasonally and eat small fish and invertebrates. As prickly dogfish, smooth dogfish are widely used for anatomical dissection by students vertebrates. Smooth dogfish family also includes two small sharks abound in the Pacific coast of the United States, smoothhound brown (Rhinotriacis henlei) and leopard shark (Triakis semifasciata), the latter is strikingly marked with black on a brown background. The dogfish name also refers to several related fishes (see Bowfin). Dogfish sharks are classified in the phylum Chordata, subphylum Vertebrata, class Chondrichthyes, Selachii order.

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