Actinopteri (ray-finned fishes) > Anguilliformes
(Eels and morays) > Ophichthidae
(Snake eels) > Ophichthinae
Etymology: Apterichtus: From the Greek απτερόν (apteron), without fins, and ίχθύς (ichtus, more correctly written ichthys;
masculine), fish.. More on authors: Jordan & Snyder.
Environment: milieu / climate zone / depth range / distribution range
Marine; demersal; depth range 15 - 240 m (Ref. 101270), usually - m (Ref. ). Subtropical; 0°C -
Northwest Pacific: Suruga Bay and Kumano-nada Sea in Japan.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 5.0 cm TL (female)
Morphology | Morphometrics
Vertebrae: 141 - 145. This species is distinguished by the following characters: tail 1.9-2.1, head 14-18, and body depth 53-74 in total length; preopercular pores 3 and pores in supratemporal canal 5 (rarely 6); anterior margin of orbit is above or behind tip of lower jaw; conical teeth, uniserial on jaws and vomer (5 vomerine teeth); body coloration when preserved pale with dark brown or dark orange blotches on preopercle and supratemporal, smaller spots on body and tail, cephalic pores and lateral-line pores in conspicuous pale spots and MVF 66-143, total vertebrae 141-145 (n= 3) (Ref. 101270).
A deepwater species, specimens were captured using dredge and trawl between 111-240 m depth but underwater photographs taken from the sandy bottom at Suruga Bay (Japan) suggest that it might occur as shallow as 15-25 m depth (Ref. 101270).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Machida, Y. and S. Ohta, 1994. A new snake-eel, Apterichtus orientalis, from the Pacific coast of western Japan (Opichthinae, Ophichthidae). Jap. J. Ichthyol. 41(1):1-5. (Ref. 13362)
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=0.00129 (0.00054 - 0.00308), b=2.92 (2.72 - 3.12), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic level (Ref. 69278
): 3.3 ±0.5 se; based on size and trophs of closest relatives
Resilience (Ref. 120179
): High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): Low vulnerability (10 of 100) .