Classification / Names
Common names | Synonyms | Catalog of Fishes(genus, species) | ITIS | CoL | WoRMS | Cloffa
Actinopteri (ray-finned fishes) > Beryciformes
(Sawbellies) > Melamphaidae
(Bigscale fishes or ridgeheads)
Etymology: Melamphaes: Greek, melan, -anos = black + Greek, amphi = both side (Ref. 45335); xestoachidus: The species name xestoachidus comes from Greek "smooth spined" and indicates the absence of a spur on the haemal arch of the first caudal vertebra (Ref. 87971)
Environment: milieu / climate zone / depth range / distribution range
Marine; bathypelagic; depth range 2400 - 3450 m (Ref. 87971), usually - m (Ref. ). Deep-water; 0°C -
Northwestern Pacific Ocean, eastwards of the Kurils Islands.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 8.7 cm SL male/unsexed; (Ref. 87971)
Morphology | Morphometrics
The species is characterized by 22–23 rakers on the first gill arch, 30 vertebrae (12 abdominal vertebrae), the haemal arch of the first caudal vertebra is without a spur; D III 14–15; P 16; seven soft rays in the ventral fin; ventral fin starts from the vertical line of the posterior margin of the pectoral fin basement; the anal fin starts from the vertical line of the last ray of the dorsal fin; eight scales are on the operculum (Ref. 87971).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Kotlyar, A.N., 2011. Revision of genus Melamphaes (Melamphaidae). I. Multi-raker species: M. lugubris, M. xestoachidus sp. nova, M. microps, M. manifestus sp. nova. J. Ichthyol. 51(8):557-568. (Ref. 87971)
IUCN Red List Status (Ref. 124695)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingNutrientsMass conversion
Estimates based on models
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01023 (0.00409 - 0.02558), b=3.04 (2.82 - 3.26), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic level (Ref. 69278
): 3.6 ±0.2 se; based on size and trophs of closest relatives
Resilience (Ref. 120179
): Low, minimum population doubling time 4.5 - 14 years (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): Moderate to high vulnerability (46 of 100) .