 The nursehound ( Scyliorhinus stellaris ) , also known as the large @-@ spotted dogfish , greater spotted dogfish , or bull huss , is a species of catshark , belonging to the family Scyliorhinidae , found in the northeastern Atlantic Ocean . It is generally found among rocks or algae at a depth of 20 – 60 m ( 66 – 197 ft ) . Growing up to 1 @.@ 6 m ( 5 @.@ 2 ft ) long , the nursehound has a robust body with a broad , rounded head and two dorsal fins placed far back . It shares its range with the more common and closely related small @-@ spotted catshark ( S. <unk> ) , which it resembles in appearance but can be distinguished from , in having larger spots and nasal skin flaps that do not extend to the mouth . 
