Family Trachichthyidae

Optivus - The slender roughy, Optivus elongatus, is a small slimehead of the family , the only member of the genus Optivus, found in the western Pacific Ocean around Australia and New Zealand at depths of between 1 and 100 m.

Sorosichthys - The little pineapple fish, Sorosichthys ananassa, is a small slimehead of the family Trachichthyidae, the only member of the genus Sorosichthys, found in the eastern Indian Ocean, on the continental shelf of the southwestern coasts of Western Australia and South Australia, at depths of between 50 and 70 m.