Actinopterygii (ray-finned fishes) > Ophidiiformes
(Cusk eels) > Ophidiidae
(Cusk-eels) > Neobythitinae
Etymology: Xyelacyba: Greek, xyele, -es = plane (tool) + Greek, kybeia, -ou = a fish (Ref. 45335). More on author: Cohen.
Environment: milieu / climate zone / depth range / distribution range
Marine; bathydemersal; depth range 984 - 2500 m (Ref. 34024). Deep-water
Possibly worldwide in tropical and subtropical seas (but not yet caught in the eastern Pacific) (Ref. 34024). Eastern Atlantic: 2 specimens between 12°N and 9°25'N. Western Atlantic: Gulf of Mexico to off southern Brazil. Northwest Pacific: Ashizuri Cape, Japan.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 57.0 cm TL male/unsexed; (Ref. 3686)
soft rays: 74. Body and tail strongly compressed, snout round and short, no spine on tip. Head and body uniformly whitish, margins of median fins light brown, jaws, pelvic fins, mouth and gill cavities deep brown. Peritoneum and stomach deep brown, intestine yellowish.
A benthopelagic species at bathyal depth (Ref. 56809). Found on the continental slope (Ref. 75154). Rare species (Ref. 34024). Reproductive strategy possibly similar to other members of this family featuring oviparity, with oval pelagic eggs floating in a gelatinous mass (Ref. 205).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Nielsen, J.G., D.M. Cohen, D.F. Markle and C.R. Robins, 1999. Ophidiiform fishes of the world (Order Ophidiiformes). An annotated and illustrated catalogue of pearlfishes, cusk-eels, brotulas and other ophidiiform fishes known to date. FAO Fish. Synop. 125(18):178p. Rome: FAO. (Ref. 34024)
IUCN Red List Status (Ref. 120744)
CITES (Ref. 118484)
Threat to humans
Fisheries: of no interest
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates based on models
Preferred temperature (Ref. 115969
): 2.5 - 5.2, mean 3.5 (based on 1299 cells).
Phylogenetic diversity index (Ref. 82805
= 1.0000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01122 (0.00514 - 0.02450), b=3.04 (2.87 - 3.21), in cm Total Length, based on all LWR estimates for this body shape (Ref. 93245
Trophic Level (Ref. 69278
): 3.7 ±0.6 se; Based on size and trophs of closest relatives
Resilience (Ref. 120179
): Medium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): Moderate to high vulnerability (47 of 100) .