Longface emperor, Long-nosed emperor,
Lethrinus olivaceus, common name longface emperor or long-nosed emperor, is a species of marine ray-finned fish belonging to the family Lethrinidae, the emperors or emperor breams. This species has a wide Indo-Pacific distribution.
Lethrinus olivaceus has a body which has a standard length that is 2.8 to 3.4 times its depth with an elongated snout. In large specimens there may be a hump on the snout to the front of the eyes. The dorsal fin is supported by 10 spines and 9 soft rays while the anal fin is supported by 3 spines and 8 soft rays. The teeth on the jaws at the sides of the mouth are conical. The inner pectoral fin axilla has no scales. The overall colour is olive grey with a scattering of irregular dark blotches on the body and sinuous dark lines on the snout. This species has a maximum published total length of 100 cm (39 in), although 70 cm (28 in) is more typical.
This species is widespread in Indo-West Pacific, from Red Sea and East Africa to Samoa and Ryukyu Islands.
It is a reef-associated species and it can be found in lagoons, in sandy coastal areas and in reef slopes, at depths of 1 to 185 m.
These very active and fast swimming fishes often occur in large schools, but adults are usually solitary. They are occasionally found in small schools with Lethrinus microdon. They feed mainly on crustaceans, cephalopods and fishes.
