Lethrinus mahsena
Lethrinus mahsena, common names the sky emperor, mahsena emperor, and cutthroat emperor, is a species of emperor fish. It grows to 65 cm in length, but is commonly found at 35 to 45 cm. This fish may be yellow to greenish-blue or olive-grey, becoming paler toward the belly. It is a non-migratory, reef-associated fish that has a high commercial value. Description. The body of this species may be yellow to greenish-blue or olive-grey, becoming paler toward the belly. It commonly has nine to ten vertical bars of colour that are yellow-green  or brown and a horizontal yellow stripe lattice pattern. The base of the scales may be dark or even black. At the base of the pectoral fins, there is a red bar. It grows to a maximum length of 65 cm, but is commonly found at 35 to 45 cm. The head is purplish-grey, occasionally with a red patch on the nape. It has a moderately short snout. The lips are a strong red colour. There is a red line running from the corner of the mouth toward the tail, and in some specimens there is a line of  white or yellow colouration running forward from the eye through the nostrils. The profile of the dorsal fin is almost straight to slightly concave. The fins are generally reddish, especially toward the tips. Distribution. This species is known to live in the Red Sea, the waters of East Africa including the waters around Madagascar. It has also been recorded southern Japan, Polynesia, the Seychelles, Cebu, Philippines, the western Indian Ocean, and the waters of Sri Lanka. Habitat. "Lethrinus mahsena" is a non-migratory, reef-associated fish. It lives in waters ranging from 2 to 100 metres in depth. It is  found in coral reefs and the adjacent sandy bottoms. It also lives in seagrass areas. Diet. This fish is known to feed on echinoderms (in particular, sea urchins), crustaceans, and other fishes. It also eats molluscs, tunicates, sponges, polychaetes. Human uses. "Lethrinus mahsena" is highly valued as a commercial fish and is considered to be very expensive. It is also caught by recreational fishers. It may have an undesirable 'coral' taste and odor when caught in some areas of the Indian Ocean. This fish is caught mostly using handlines, traps, and by trawling.