Lethrinus olivaceus, Longface emperor : fisheries
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Lethrinus olivaceus Valenciennes, 1830

Longface emperor
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Lethrinus olivaceus   AquaMaps   Data sources: GBIF OBIS
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Lethrinus olivaceus
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Classification / Names Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Actinopterygii (ray-finned fishes) > Perciformes (Perch-likes) > Lethrinidae (Emperors or scavengers) > Lethrininae
Etymology: Lethrinus: Greek, lethrinia, a fish pertaining to genus Pagellus.  More on author: Valenciennes.

Environment: milieu / climate zone / depth range / distribution range Ecology

Marine; reef-associated; non-migratory; depth range 1 - 185 m (Ref. 9710).   Tropical; 33°N - 35°S, 33°E - 135°W

Distribution Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri

Indo-West Pacific: Red Sea and East Africa to Samoa and Polynesia, north to the Ryukyu Islands.

Length at first maturity / Size / Weight / Age

Maturity: Lm ?, range 34 - ? cm
Max length : 100.0 cm TL male/unsexed; (Ref. 2295); common length : 70.0 cm TL male/unsexed; (Ref. 2295); max. published weight: 14.0 kg (Ref. 9710)

Short description Morphology | Morphometrics

Dorsal spines (total): 10; Dorsal soft rays (total): 9; Anal spines: 3; Anal soft rays: 8. This species is distinguished by the following characters: body moderately slender, its depth 2.9-3.4 times in standard length; head length 1.1-1.3 times in body depth, 2.4-2.9 times in SL, dorsal profile near eye nearly straight or with small bump; snout length about 1.7-2.2 times in HL, measured without the lip the snout is 0.6-0.8 times in cheek height, its dorsal profile slightly concave, snout angle relative to upper jaw between 40° and 50°; interorbital space convex to flat; posterior nostril a longitudinal oblong opening, closer to orbit than anterior nostril; eye situated close to or not close to dorsal profile, its length 3.4-6.2 times in HL; cheek height 3 to 3.8 times in HL; lateral teeth in jaws conical; outer surface of maxilla smooth; D X, 9 with the 3rd or 4th dorsal-fin spine the longest, its length 2.4-2.8 times in body depth; A III,8 with the first soft ray usually the longest, its length almost equal to or slightly shorter than length of base of soft-rayed portion of anal fin and 1.3-1.7 times in length of entire anal-fin base; pectoral-fin rays 13; pelvic-fin membranes between rays closest to body with dense melanophores; cheek without scales; 46-48 lateral-line scales; 5 ½ scale rows between lateral line and base of middle dorsal-fin spines; usually 16-17 scale rows in transverse series between origin of anal fin and lateral line; 15 rows in lower series of scales around caudal peduncle; 6-9 scales in supratemporal patch; inner surface of pectoral-fin base without scales; posterior angle of operculum fully scaly. Colour of body grey, lighter ventrally, often with scattered irregular dark blotches; snout with wavy dark streaks, upper jaw, especially near corner of mouth sometimes edged behind with red (Ref. 114226).

Biology     Glossary (e.g. epibenthic)

Largest and the longest-snouted lethrinid (Ref. 37816). Found in sandy coastal areas, lagoons, and reef slopes (Ref. 30573). Juveniles are found in shallow sandy areas. Often occurs in large schools. Adults deep along coastal slopes and drop-offs, usually solitary (Ref. 48635). Very active and swims fast (Ref. 90102). Feeds mainly on fish, crustaceans, and cephalopods. In Palau, it spawns throughout the year on the first few days of the lunar month along the edges of reefs. Large individuals often ciguatoxic in New Caledonia and possibly elsewhere in Oceania (Ref. 9775). Caught mostly with handline and traps, occasionally by trawls and gill nets (Ref. 68703). Ref. 48635 reports maximum depth of occurrence.

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Protogyny have yet to be confirmed for this species.

Main reference Upload your references | References | Coordinator | Collaborators

Carpenter, K.E. and G.R. Allen, 1989. FAO Species Catalogue. Vol. 9. Emperor fishes and large-eye breams of the world (family Lethrinidae). An annotated and illustrated catalogue of lethrinid species known to date. FAO Fish. Synop. 125(9):118 p. Rome: FAO. (Ref. 2295)

IUCN Red List Status (Ref. 120744)

  Least Concern (LC) ; Date assessed: 09 March 2015

CITES (Ref. 118484)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Reports of ciguatera poisoning (Ref. 2295)

Human uses

Fisheries: commercial
FAO(Publication : search) | FishSource | Sea Around Us

More information

FAO areas
Food items
Food consumption
Common names
Spawning aggregation
Egg development
Larval dynamics
Aquaculture profile
Allele frequencies
Mass conversion
Stamps, Coins Misc.
Swim. type
Gill area


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Internet sources

Estimates based on models

Preferred temperature (Ref. 115969): 23.3 - 28.4, mean 27.1 (based on 1006 cells).
Phylogenetic diversity index (Ref. 82805):  PD50 = 0.5000   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01479 (0.01262 - 0.01734), b=2.98 (2.94 - 3.02), in cm Total Length, based on LWR estimates for this species (Ref. 93245).
Trophic Level (Ref. 69278):  4.0   ±0.4 se; Based on diet studies.
Resilience (Ref. 120179):  Low, minimum population doubling time 4.5 - 14 years (K=0.06-0.25; tm=4.1-6; tmax=15).
Prior r = 0.28, 95% CL = 0.16 - 0.49, Based on 2 stock assessments.
Vulnerability (Ref. 59153):  Moderate vulnerability (40 of 100) .
Price category (Ref. 80766):   Very high.