The Smooth alligatorfish (Anoplagonus inermis, also known as the Smooth poacher or the Smooth sea-poacher) is a fish in the family Agonidae (poachers). It was described by Albert Günther in 1860. It is a marine, temperate water-dwelling fish which is known from the northern Pacific Ocean, including California, USA, and possibly Korea. It dwells at a depth range of 8-102 metres, usually around rocks. Males can reach a maximum total length of 15 centimetres. The Smooth alligatorfish is preyed upon by the Pacific halibut (Hippoglossus stenolepis). It is often caught by shrimp trawlers.