About Gobiodon citrinus (Rüppell, 1838)
Gobiodon citrinus, commonly known as the poison goby, is a species of goby. It is native to the Indian Ocean, ranging from the Red Sea and the African coast to the western Pacific Ocean, reaching as far as Japan, Samoa, and the Great Barrier Reef. It is a reef-dwelling fish found at depths between 2 and 20 metres (7 to 66 ft), and lives in association with Acropora corals. The mucus this fish produces is toxic. This species reaches a maximum total length of 6.6 centimetres (2.6 in). Its body colour varies, and individuals can be either dark brown or pale yellow. It also has blue vertical lines running around its eyes and gills. This species is traded in the aquarium hobby and has been successfully reared in captivity.
