The Dogtooth tuna, Gymnosarda unicolor, also known as white tuna, is a species of pelagic marine fish which belongs to the family Scombridae. The dogtooth tuna can reach a length of 190 to 248 centimetres in males and a weight of 130 kilograms. The average length commonly observed is around 40 to 120 centimetres. They have 12 to 14 dorsal soft rays and 12 to 13 anal soft rays. The lateral line is undulates strongly.