Dusky smooth-hound Dusky smooth-hound The dusky smooth-hound ("Mustelus canis"), also called the smooth dogfish or the dog shark, is a species of houndshark in the family Triakidae. This shark is an olive grey or brown in color, and may have shades of yellow or grayish white. Females live to 16 years and males have a lifespan of 10 years. "M. canis" was the first shark recognised to have viral infections. "M. canis" can be known as smooth dogfish, Atlantic smooth dogfish, dusky smooth-hound, grayish, nurse shark, smooth dog, or smooth-hound. It was originally named "Squalls canis". In Latin, "mustelus" translates to weasel
Spotless smooth-hound continental shelf and in semi-enclosed areas of sea at depths down to and possibly as deep as . It is found near the seabed, often over sandy substrates and is thought to feed on crustaceans and other benthic invertebrates. The spotless smooth-hound is viviparous. Males become sexually mature at a length of between and females at . Litter size varies between about five and sixteen pups which are nourished by yolk sac placentas. The gestation period is about ten months and the pups measure about at birth. Maximum recorded age is nine years. The spotless smooth-hound is used for human