Actinopterygii (ray-finned fishes) > Perciformes
(Perch-likes) > Lethrinidae
(Emperors or scavengers) > Monotaxinae
Etymology: Gymnocranius: Greek, gymnos = naked + Greek, kranion = skull (Ref. 45335). More on author: Günther.
Environment: milieu / climate zone / depth range / distribution range
Marine; reef-associated; non-migratory; depth range 15 - 50 m (Ref. 2295). Tropical; 35°N - 28°S, 105°E - 170°W
Western Pacific: including southern Japan, South China Sea, Australia, Coral Sea, New Caledonia, and Tonga. Recently reported from Norfolk Island (Ref. 8881).
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 45.0 cm TL male/unsexed; (Ref. 2295); common length : 35.0 cm TL male/unsexed; (Ref. 2295)
Occurs over sand and rubble areas adjacent to rock and coral reefs in lagoons and outer slopes (Ref. 9775, 90102). Feeds on bottom-dwelling gastropods. Also caught with bottom longlines and handlines (Ref. 9775). Marketed fresh.
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
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)
CITES (Ref. 118484)
Threat to humans
Fisheries: minor commercial
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates based on models
Preferred temperature (Ref. 115969
): 24.3 - 28.9, mean 27.6 (based on 408 cells).
Phylogenetic diversity index (Ref. 82805
= 0.5010 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01905 (0.01069 - 0.03395), b=2.97 (2.82 - 3.12), in cm Total Length, based on LWR estimates for this species & (Sub)family-body (Ref. 93245
Trophic Level (Ref. 69278
): 3.8 ±0.0 se; Based on diet studies.
Generation time: 5.0 ( na - na) years. Estimated as median LN(3)/K based on 2 growth studies.
Resilience (Ref. 120179
): Medium, minimum population doubling time 1.4 - 4.4 years (K=0.22-0.24).
Vulnerability (Ref. 59153
): Moderate vulnerability (40 of 100) .