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Info about Dogfish

Dogfishes numbers are going down. The average numbers of Dogfish in the wild is about 6000. The spiny dogfish is known primarily by virtue of its largest representative, the real spiny dogfish, Squalus acanthias. But the name "spiny dogfish" is not reserved for this one specific species alone. It covers an entire family of spiny dogfish including, for example, such different forms as Greenland sharks or cookie-cutter sharks. The name "spiny" shark is actually misleading since contrary to expectations, not all species of the group have the typical spines in front of the dorsal fin. Although the species in this family in part look different, they do have one thing in common: the suction holes behind the eyes and the lack of an anal fin. Most species of spiny dogfish actually live quite deep in the ocean. Obviously, this makes their observation in their natural environment very difficult and much of our knowledge on this species is thus speculative. Generally speaking, very little is known about its biology. The best researched species is the real spiny dogfish, Squalus acanthias, whereby here too, knowledge is mostly limited to information relevant to fishing.The distribution of the real spiny dogfish is limited (see map) since these animals generally prefer a water temperature ranging between 7 and 15 degrees. Nevertheless, they may well have the largest population of any given shark species. The annual catch along the Massachusetts (USA) coast alone used to amount to approximately 27,000 tons.