Common smooth-hound shark but in males, the pelvic fins are modified to form claspers. Like other smooth hounds, the common smooth hound will aggregate in large numbers, like a pack of dogs. This is why they are called hounds. Common smooth-hound The common smooth-hound ("Mustelus mustelus") is a houndshark of the family Triakidae. It is found in the eastern Atlantic Ocean from the British Isles to South Africa, and in the Mediterranean Sea, Madeira, and the Canary Islands at depths ranging from 5 m to 625 m (although they usually stay at depths between 5-50m). While they can grow to 200 cm,
Humpback smooth-hound the three species it is the humpback smooth-hound that is the main target of the tollo fishery in Peru. Landings averaging 11,000 tons of tollo per year were made in that country between 1965 and 1989, but quantities caught diminished thereafter. A minimum size requirement of was set in 2001 but was pitched so low as to have limited conservation effect. The International Union for Conservation of Nature (IUCN) has rated the status of the humpback smooth-hound as being "vulnerable" and considers more should be done to publicise and enforce the size limit. Humpback smooth-hound The humpback smooth-hound ("Mustelus whitneyi")