The spotted estuary smooth-hound or rig (Mustelus lenticulatus) is a houndshark of the familyTriakidae, found on the continental shelves and in estuaries around New Zealand.[2] It is closely related to the gummy shark (Mustelus antarcticus) of Australia.[3] Males can grow up to a length of 125 cm (49 in), while females can reach a length of 151 cm (59 in).[2]