Speckled smooth-hound seabed on the continental shelf at depths of between . Reports of this fish occurring in the Atlantic Ocean off the coast of Argentina are thought to be erroneous, and are likely to refer to the narrownose smooth-hound ("Mustelus schmitti"), another shark that is speckled with white spots. The speckled smooth-hound is ovoviviparous with eggs that develop within the female and hatch into juvenile fish which are about at birth. Litter sizes are typically seven. Along with the humpback smooth-hound ("Mustelus whitneyi") and the spotted houndshark ("Triakis maculata"), this fish is known to local fisheries as "tollo" and is caught
Narrownose smooth-hound Narrownose smooth-hound The narrownose smooth-hound ("Mustelus schmitti") is a houndshark of the family Triakidae. It is found on the continental shelves of the subtropical southwest Atlantic, from southern Brazil to northern Argentina, between latitudes 30° S and 44° S, at depths between 60 m to 195 m. It can reach a length of 74 centimeters. Narrownose smooth-hounds feed on crabs and probably other crustaceans, and presumably small fishes. Narrownose smooth-hounds are also caught and utilized for human consumption. The reproduction of this houndshark is Ovoviviparous, with 2 to 7 pups per litter, and a birth length of about 26 cm.