The humphead wrasse (Cheilinus undulatus) is an endangered coral reef fish belong to the family Labridae. This fish is found broadly distributed in the Indo-Pacific. It can be found living on coral reefs at depths of 5 to 60 m. It diets includes fishes and benthic, hard-shelled, invertebrates such as molluscs and crustaceans (Carpenter & Niem, 2001).

The adults will develop a large hump on forehead that can protrude anterior to eye. The size a mature humphead wrasse can reach up to 2.29 m in total length, and the heaviest fish recorded is 190.5 kg. However, the common total length of male is around 60 cm. The body colour of the humphead wrasse is olive to green with a vertical dark bar on each scale above and behind pectoral fins. The head of the adults is blue-green with highly irregular undulating yellowish lines. Also, the adults have two black lines extending posteriorly from eye. For juvenile, the colouration is lighter to white with dark scale bars and prominent black line extending posteriorly from eyes. Also, the juvenile has two lines extending diagonally up and back from eye and two diagonally downward on snout in front of eye (Carpenter & Niem, 2001).