Butterfly fish are a group of tropical marine fish of the family ‘Chaetodontidae’. Butterfly fish are found mostly on the reefs of the Atlantic, Indian and Pacific Oceans. Butterfly fish are small fish and most do not exceed 12 – 22 centimetres in length apart the largest of the species, the Lined butterfly fish (Chaetodon lineolatus), which grows to 30 centimetres in length.