Yellowtail kingfish grow to over 200cm and 58kg. At 4-5 years of age and around 74cm in length, yellowtail kingfish reach sexual maturity. They are large, powerful and hard-fighting fish, and therefore provide excellent sport for game-fishermen. They are often confused with the amberjack. This species is purple-blue along the back and upper flanks, and silver on the belly. A bright yellow ribbon separates the upper and lower colours, running from head to tail. The tail is distinctly yellow.