Actinopteri (ray-finned fishes) > Scombriformes
(Mackerels) > Gempylidae
Etymology: Rexea: Latin, rex, rego = king.
More on author: Alcock.
Environment: milieu / climate zone / depth range / distribution range
Marine; brackish; benthopelagic; depth range 143 - 820 m (Ref. 9784). Deep-water; 34°N - 27°S, 40°E - 155°E (Ref. 6181)
Indo-West Pacific: Mozambique Channel, Saya de Malha Bank, Maldives Islands, India, Sri Lanka, Arafura and Java seas, Makassar Strait, northwestern and northeastern Australia and southern Japan (Ref. 6181). Also recorded from New Caledonia (Ref. 33346).
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 22.0 cm SL male/unsexed; (Ref. 9784)
(total): 19 - 20;
soft rays: 11 - 13;
Vertebrae: 34. Spinescent gill rakers with 3 or 4 cusps. Lateral line branching from below the 5th to before the 6th spine of the first dorsal fin; the upper lateral line reaching at least to the end of the soft dorsal fin base.
Matures at about 10 cm standard length. A squid was found in the stomach of one specimen (Ref. 9784).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Nakamura, I. and N.V. Parin, 1993. FAO Species Catalogue. Vol. 15. Snake mackerels and cutlassfishes of the world (families Gempylidae and Trichiuridae). An annotated and illustrated catalogue of the snake mackerels, snoeks, escolars, gemfishes, sackfishes, domine, oilfish, cutlassfishes,. scabbardfishes, hairtails, and frostfishes known to date. FAO Fish. Synop. 125(15):136 p. (Ref. 6181)
IUCN Red List Status (Ref. 125652)
Threat to humans
Fisheries: subsistence fisheries
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingNutrientsMass conversion
Estimates based on models
Preferred temperature (Ref. 123201
): 8.8 - 17.3, mean 11.7 °C (based on 319 cells).
Phylogenetic diversity index (Ref. 82804
= 0.5078 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00372 (0.00166 - 0.00830), b=3.10 (2.91 - 3.29), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic level (Ref. 69278
): 4.5 ±0.37 se; based on food items.
Resilience (Ref. 120179
): High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref. 59153
): Low vulnerability (17 of 100).