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Lethrinus olivaceus  Valenciennes, 1830

Longface emperor
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Lethrinus olivaceus
Picture by Randall, J.E.


Australia country information

Common names: Long-nosed emperor, Longface emperor, Longnose emperor
Occurrence: native
Salinity: marine
Abundance: | Ref:
Importance: | Ref:
Aquaculture: | Ref:
Regulations: | Ref:
Uses: no uses
Comments: Reported from the Territory of Ashmore and Cartier Islands (Ref. 75154). Also Ref. 2295.
National Checklist:
Country Information: httpss://www.cia.gov/library/publications/resources/the-world-factbook/geos/as.html
National Fisheries Authority: https://www.csiro.au/
Occurrences: Occurrences Point map
Main Ref: Hoese, D.F., D.J. Bray, J.R. Paxton and G.R. Allen, 2006
National Database:

Classification / Names

Actinopterygii (ray-finned fishes) > Perciformes (Perch-likes) > Lethrinidae (Emperors or scavengers) > Lethrininae
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL

Common names from other countries

Main reference

Size / Weight / Age

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)

Length at first maturity
Lm ?, range 34 - ? cm

Environment

Marine; reef-associated; non-migratory; depth range 1 - 185 m (Ref. 9710)

Climate / Range

Tropical, preferred ?; 33°N - 35°S, 33°E - 135°W

Distribution

Indo-West Pacific: Red Sea and East Africa to Samoa and Polynesia, north to the Ryukyu Islands.
Countries | FAO areas | Ecosystems | Occurrences | Introductions

Short description

Dorsal spines (total): 10; Dorsal soft rays (total): 9; Anal spines: 3; Anal soft rays: 8. Probably the largest, longest-snouted lethrinid. Crimson cast on face and fins may develop in large courting males (Ref. 1602). Body color is gray, becoming lighter ventrally, often with scattered irregular dark blotches. The snout has wavy dark streaks. The upper jaw, especially near the corner of the mouth, is sometimes edged with red. Very similar to L. microdon, but more scales above lateral line and caudal fin more forked when young (Ref. 48635).

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). Ref. 48635 reports maximum depth of occurrence.

IUCN Red List Status (Ref. 115185)

Threat to humans

  Reports of ciguatera poisoning (Ref. 2295)



Human uses

Fisheries: commercial

More information

Common names
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Metabolism
Predators
Ecotoxicology
Reproduction
Maturity
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Fecundity
Eggs
Egg development
Age/Size
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Length-weight
Length-length
Length-frequencies
Morphometrics
Morphology
Larvae
Larval dynamics
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References
Aquaculture
Aquaculture profile
Strains
Genetics
Allele frequencies
Heritability
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Ciguatera
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Tools

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Internet sources

Estimates of some properties based on models

Phylogenetic diversity index (Ref. 82805)
PD50 = 0.5000 many relatives (e.g. carps) 0.5 - 2.0 few relatives (e.g. lungfishes)

Trophic Level (Ref. 69278)
4.0   ±0.4 se; Based on diet studies.

Resilience (Ref. 69278)
Low, minimum population doubling time 4.5 - 14 years (K=0.06-0.25; tm=4.1-6; tmax=15)

Vulnerability (Ref. 59153)
Moderate vulnerability (40 of 100)
Price category (Ref. 80766)
Very high