Emperors or sometimes called the scavengers are found mainly in tropical waters of the Indo-Pacific and Indian Oceans. They are excellent food fish.
Emperors are bottom-feeding carnivores consuming invertebrates and small fishes. Some species have molariform teeth which they use to eat invertebrates such as molluscs and crabs. Emperors can be solitary or schooling and do not appear to be territorial. They often form large aggregations for pelagic spawning. They have large eyes that enable them to feed at night.
There are about 41 species of emperors that make up the Lethrinidae family worldwide. Malaysia is represented by all 5 genera and about 29 species.
This page shows only the Letrinus genus which is also called the Pigface Bream. The Letrinus have a scale-less check which distinguish them from other Lethrinidae. The other genera in Lethrinidae family is shown as Large-eye Bream.
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Scientific Name: Lethrinus harak (Forsskål, 1775) English Name: Thumbprint Emperor, Blackspot Emperor Mandarin Name: 龙占 (Lóng zhàn), 单斑龙占 (Dān bān lóng zhàn) Local Malay Name: Ikan Pelandok, Landuk, Mempinang, Ketambak, Asuh, Landok Tanda Local Hokkien: Leng Jiam Main Diagnostic Features: A large elliptical blotch, often broadly edged in yellow, on side directly below lateral line and centered at a vertical near the posterior tip of the pectoral fin. Size: Maximum size about 50 cm total length; commonly to around 30 cm.   Scientific Name: Lethrinus lentjan (Lacepède, 1802) English Name: Pink Ear Emperor, Bridled Pigface Bream French Name: Empereur Lentilles Mandarin Name: 龙占 (Lóng zhàn), 乌帽龙占 (Wū mào lóng zhàn), 紅鰽痣 (Hóng qiú zhì) Local Malay Name: Ikan Pelandok, Landuk, Mempinang, Ketambak, Asuh, Senoncing, Landok Calit Merah Local Hokkien: Leng Jiam Main Diagnostic Features: Red blotches on edge of operculum and base of pectoral fin base. Size: Maximum size about 50 cm total length; commonly to around 30 cm.   Scientific Name: Lethrinus nebulosus (Forsskål, 1775) English Name: Spangled Emperor Mandarin Name: 龙占 (Lóng zhàn), 青嘴龙占 (Qīng zuǐ lóng zhàn) Local Malay Name: Ikan Pelandok, Landuk, Mempinang, Ketambak, Asuh, Senoncing, Landok Sisik Bintik Main Diagnostic Features: Many scales centres with a white or light blue spot. Size: Maximum total length about 80 cm; commonly between 20 and 50 cm.  Scientific Name: Lethrinus olivaceus Valenciennes, 1830 English Name: Longface Emperor, Longnose Emperor Mandarin Name: 龙占 (Lóng zhàn), 尖吻龙占 (Jiān wěn lóng zhàn) Local Malay Name: Ikan Pelandok, Landuk, Mempinang, Ketambak, Asuh, Senoncing, Landok Ketambak Main Diagnostic Features: Very long and pointed snout; body color is gray, often with scattered irregular dark blotches; snout with wavy dark streaks. Size: Maximum total length about 100 cm; commonly 70 cm.   Scientific Name: Lethrinus ornatus Valenciennes, 1830 English Name: Ornate Emperor French Name: Empereur Orn Mandarin Name: 龙占 (Lóng zhàn), 黄带龙占 (Huáng dài lóng zhàn) Local Malay Name: Ikan Pelandok, Landuk, Mempinang, Ketambak, Asuh, Senoncing, Landok Jalur Jingga Main Diagnostic Features: Posterior edge of opercle and preopercle are bright red in colour. Size: Maximum total length 40 cm.   Scientific Name: Lethrinus variegatus Valenciennes, 1830 English Name: Slender Emperor, Variegated Emperor French Name: Empereur Bas Cou Mandarin Name: 龙占 (Lóng zhàn), 杂色龙占 (Zá sè lóng zhàn), 杂色裸颊鲷 (Zá sè luǒ jiá diāo) Local Malay Name: Ikan Pelandok, Landuk, Mempinang, Ketambak, Asuh, Senoncing, Landok Lampai Size: Maximum total length about 20 cm.  
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