Doederleinia berycoides, the rosy seabass or blackthroat seaperch, is a species of fish in the family Acropomatidae, the temperate ocean-basses or lanternbellies. It is the only species in the monotypic genus Doederleinia. It is native to the eastern Indian Ocean and the western Pacific Ocean from Japan to Australia. In Japan it is known as Akamutsu. Its head and body are red in color. It lacks the luminous organ present in many other members of the lanternbelly family. It has rows of conical teeth with large canines. The fish grows to a length of 40 centimetres (16 in) TL.