Antifreeze proteins are also known from Southern Ocean snailfish and eelpouts. In 1876 the expedition found the Challenger Deep, habitat of the Mariana snailfish. It is classified under the genus "Liparis" of the snailfish family Liparidae. The habitats chosen by snailfish are as widely variable as their size. Antifreeze proteins are also known from Southern Ocean snailfish. The snailfish (Agonopsis chiloensis) is a fish in the family Agonidae (poachers). Herring, redfish, snailfish, sand lance, and Atlantic salmon are also common prey items. Liparis is a large genus of snailfish from the northern hemisphere. Tens of undescribed species also occur in the region, especially among the snailfish. The snailfish family is poorly studied and few specifics are known. In May 2017, an unidentified type of snailfish was filmed at a depth of . Snailfish are of no interest to commercial fisheries. In the past, snailfish were sometimes included within the latter family. Snailfish range in size from "Paraliparis australis" at to "Polypera simushirae" at some in length.