Actinopteri (ray-finned fishes) > Lampriformes
(Velifers, tube-eyes and ribbonfishes) > Radiicephalidae
Etymology: Radiicephalus: Latin, radius + Greek, kephale = head (Ref. 45335).
Environment: milieu / climate zone / depth range / distribution range
Marine; pelagic-oceanic; depth range 570 - m (Ref. 58018), usually - m (Ref. ). Deep-water; 0°C - ; 38°N - 40°S, 130°W - 20°E
Eastern Atlantic: off Morocco and the Azores (Ref. 6739) southward to Cape Point, South Africa (Ref. 6551). Eastern Pacific: present in the California Current region (Ref. 36609).
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 76.0 cm TL male/unsexed; (Ref. 4506)
Mesopelagic species (Ref. 6808). Adults feed on lantern-fishes (Myctophidae) and possibly euphausiid crustaceans (Ref. 6739). Oviparous, with planktonic larvae (Ref. 36609). They have the ability to discharge dark brown fluid from the ink-sac when alarmed.
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Aguiar, A. and J.-C. Quéro, 1990. Trachipteridae. p. 647-649. 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. 2. (Ref. 4506)
IUCN Red List Status (Ref. 124695)
Threat to humans
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingNutrientsMass conversion
Estimates based on models
Preferred temperature (Ref. 115969
): 4.5 - 7, mean 5.8 °C (based on 5 cells).
Phylogenetic diversity index (Ref. 82805
= 1.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00389 (0.00180 - 0.00842), b=3.12 (2.94 - 3.30), in cm total length, based on all LWR estimates for this body shape (Ref. 93245
Trophic level (Ref. 69278
): 3.9 ±0.63 se; based on food items.
Vulnerability (Ref. 59153
): Moderate to high vulnerability (50 of 100) .