Actinopterygii (ray-finned fishes) > Osmeriformes
(Smelts) > Bathylagidae
Etymology: Bathylagus: Greek, bathys = deep + Greek, lagos = hare (Ref. 45335); pacificus: Named after the Pacific Ocean (Ref. 6885). More on author: Gilbert.
Environment / Climate / Range
Marine; bathypelagic; depth range 772 - 7700 m (Ref. 50610), usually 600 - 800 m (Ref. 28981). Deep-water; 61°N - 27°N, 140°E - 114°W
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 25.0 cm SL male/unsexed; (Ref. 4525)
soft rays: 15 - 25;
Vertebrae: 44 - 51. Body slender and compressed. Anal fin base long and about twice the length of dorsal fin base. Eye diameter about twice snout length. Upper end of gill slit reaching above midline of side of body. No knob-like process in interorbital space. Dorsoposterior edge of operculum not curved inward. Traces of detached scales black. Color black or dark brown; bluish black on head and ventral surfaces, and on peritoneum (Ref. 6885).
Pacific: off the Pacific coast of northern Japan and the Bering Sea to the Gulf of Alaska southward to northern Baja California, Mexico.
Does not undertake a diurnal, vertical migration. Feeds heavily on crustaceans (Ref. 4525). Oviparous, with planktonic eggs and larvae (Ref. 35604).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Masuda, H., K. Amaoka, C. Araga, T. Uyeno and T. Yoshino, 1984. The fishes of the Japanese Archipelago. Vol. 1. Tokai University Press, Tokyo, Japan. 437 p. (text). (Ref. 559)
IUCN Red List Status (Ref. 96402)
CITES (Ref. 94142)
Threat to humans
Estimates of some properties based on models
Phylogenetic diversity index (Ref. 82805
= 0.5078 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00776 (0.00464 - 0.01298), b=3.07 (2.92 - 3.22), based on LWR estimates for species & (Sub)family-body shape (Ref. 93245
Trophic Level (Ref. 69278
): 3.3 ±0.42 se; Based on food items.
Resilience (Ref. 69278
): Low, minimum population doubling time 4.5 - 14 years (K=0.14 (very tentative estimate)).
Vulnerability (Ref. 59153
): Moderate to high vulnerability (52 of 100) .