Slender smooth-hound thus the International Union for Conservation of Nature (IUCN) has listed it under Least Concern. However, this shark's very low fecundity would render it susceptible to population depletion should fishing pressure increase in the future. Slender smooth-hound The slender smooth-hound or gollumshark ("Gollum attenuatus") is a species of ground shark in the family Pseudotriakidae. It is endemic to the waters around New Zealand, where it is usually found close to the bottom over the continental slope at depths of . An extremely slim, plain brownish shark reaching in length, the slender smooth-hound can be identified by its broad, flattened head
Dusky smooth-hound and "canis" translates to dog. "M. canis" has an allopatric relationship with "M. mustelus" (common smooth-hound) and a sympatric relationship with "M. norrisi" (narrowfin smooth-hound). "M. canis" is found in marine and brackish waters and is demersal (bottom-dwelling) and oceanodromous (migratory in seas). They can be found between 42°N and 44°S and 100 and 46° W. "M. canis" in the North Atlantic migrates in response to changing temperature. In winter, they can be found in the Carolinas to the outlet of the Chesapeake Bay, and in summer from the mid-Atlantic to southern New England. They are most abundant on the