Actinopterygii (ray-finned fishes) > Myctophiformes
(Lanternfishes) > Myctophidae
(Lanternfishes) > Lampanyctinae
Etymology: Nannobrachium: Latin, nannus = small + Latin, brachium = the upper arm from the shoulder to the elbow; 1731 (Ref. 45335); ritteri: Named after Dr. Ritter, Director of the Scripps Institution of Oceanography (Ref. 6885). More on author: Gilbert.
Environment: milieu / climate zone / depth range / distribution range
Marine; bathypelagic; depth range 20 - 1095 m (Ref. 6885). Deep-water; 54°N - 18°N, 135°E - 111°W
Northeast Pacific: British Columbia, Canada to Baja California, Mexico. Bekker (1983) reported a distribution from off Central and South America but this is an error (Ref. 36121). Larvae collected from Taiwan Strait (Ref. 43570).
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 12.0 cm SL male/unsexed; (Ref. 36121)
Morphology | Morphometrics
soft rays: 18 - 19;
Vertebrae: 36 - 38. 15-16 AO photophores; 7-8 tooth patches on lower limb of second gill arch; 35-38 lateral line organs (Ref. 36121). Pectoral fins well developed with rather robust, stout rays (Ref. 36121). Nearly black to metallic blue dorsally, lighter on sides, black in mouth and gill cavity; fins dusky, marked with fine wavy lines (Ref. 6885).
Epipelagic to mesopelagic (Ref. 31442). Adults feed on Sagitta, young fishes, copepods, and euphausiids (Ref. 6885). Oviparous, with planktonic eggs and larvae (Ref. 31442). Lipid content is 14.2 % in fresh body weight and wax ester is 58% in total lipids (Ref. 9197).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Zahuranec, B.J., 2000. Zoogeography and systematics of the lanternfishes of the genus Nannobrachium (Myctophidae: Lampanictini). Smithson. Contrib. Zool., 607:1-69. (Ref. 36121)
IUCN Red List Status (Ref. 120744)
CITES (Ref. 118484)
Threat to humans
Estimates based on models
Preferred temperature (Ref. 115969
): 5.4 - 9.7, mean 7.1 (based on 27 cells).
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00851 (0.00399 - 0.01817), b=3.16 (2.97 - 3.35), in cm Total Length, based on LWR estimates for this species & (Sub)family-body (Ref. 93245
Trophic Level (Ref. 69278
): 3.4 ±0.45 se; Based on food items.
Generation time: 3.1 ( na - na) years. Estimated as median LN(3)/K based on 1 growth studies.
Resilience (Ref. 120179
): Medium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): Low to moderate vulnerability (31 of 100) .