Environment: milieu / climate zone / depth range / distribution range
Marine; bathypelagic; depth range 500 - 7625 m (Ref. 58426), usually 1200 - 1400 m (Ref. 559). Deep-water; 67°N - 56°N, 180°W - 180°E
Circumglobal: In tropical to temperate waters. Eastern Pacific: ranges from northern California to Peru (Ref. 35600).
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 100.0 cm TL male/unsexed; (Ref. 27000); common length : 55.0 cm NG male/unsexed; (Ref. 5755)
spines: 0. Mouth greatly enlarged by a backward extension of jaws, gape comprising half or more of preanal length; buccal cavity greatly distensible. Tail attenuated and ending in an expanded, luminous caudal organ. Caudal fin absent; scales absent; lateral line without pores, instead with groups of elevated tubules.
Meso- to abyssopelagic (Ref. 58302) and bathypelagic (Ref. 58426). Adults feed mainly on crustaceans, but also take fishes, cephalopods, and other invertebrates (Ref. 2850, 11041). Oviparous, planktonic eggs hatch into planktonic leptocephalus larvae (Ref. 6719, 35600). Degenerative changes in males and females suggest semelparity (Ref. 35600).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Oviparous (Ref. 35600). Degenerative changes in males and females suggest semelparity (Ref. 35600). Egg cells within each of the gonads have the same developmental stage (monocyclic ovaries) suggesting only one spawning during its lifetime or periodic spawning (Ref. 36055).
Nielsen, J.G. and E. Bertelsen, 1990. Eurypharyngidae. p. 206. In J.C. Quero, J.C. Hureau, C. Karrer, A. Post and L. Saldanha (eds.) Check-list of the fishes of the eastern tropical Atlantic (CLOFETA). JNICT, Lisbon; SEI, Paris; and UNESCO, Paris. Vol. 1. (Ref. 4457)
IUCN Red List Status (Ref. 123251)
CITES (Ref. 118484)
Threat to humans
Fisheries: of no interest
Estimates based on models
Preferred temperature (Ref. 115969
): 2.3 - 5.5, mean 3.6 °C (based on 890 cells).
Phylogenetic diversity index (Ref. 82805
= 1.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00102 (0.00046 - 0.00225), b=3.06 (2.88 - 3.24), in cm total length, based on all LWR estimates for this body shape (Ref. 93245
Trophic level (Ref. 69278
): 4.1 ±0.56 se; based on food items.
Resilience (Ref. 120179
): Very Low, minimum population doubling time more than 14 years (Assuming semelparity with tm>10).
Vulnerability (Ref. 59153
): Moderate to high vulnerability (54 of 100) .