Actinopteri (ray-finned fishes) > Saccopharyngiformes
(Swallowers and gulpers) > Monognathidae
Etymology: Monognathus: Greek, monos = one + Greek, gnathos = jaw (Ref. 45335); berteli: Named after the late Erik Bertelsen (alias Bertel) in recognition of his contribution to our knowledge of the Monognathidae and many other groups of deep sea fishes. More on authors: Nielsen & Hartel.
Environment: milieu / climate zone / depth range / distribution range
Marine; bathypelagic; depth range 1018 - 1430 m (Ref. 40803), usually - m (Ref. ). Deep-water; 0°C -
Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri
Western Indian Ocean: known from the type locality, 5°12.79'N, 49°00.98'E.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 5.8 cm OT male/unsexed; (Ref. 40803)
Morphology | Morphometrics
soft rays: 50;
Vertebrae: 86. Belongs to the short-skulled species-group of Monognathus. Anterior dorsal fin-ray above vertebra number 4, five vertebrae between anus and anal fin, length of pectoral fins 9.5% and posterior urostyle filament 53% of total length.
Length measured from tip of snout to base of urostyle.
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Nielsen, J.G. and K.E. Hartel, 1996. Monognathus berteli sp. nov. from the Indian Ocean (Pisces, Monognathidae). Ichthyol. Res. 43(2):113-115. (Ref. 40803)
IUCN Red List Status (Ref. 124695)
Threat to humans
CountriesFAO areasEcosystemsOccurrencesIntroductionsStocksEcologyDietFood itemsFood consumptionRation
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingNutrientsMass conversion
Estimates based on models
Phylogenetic diversity index (Ref. 82805
= 0.5001 [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
): 3.3 ±0.5 se; based on size and trophs of closest relatives
Vulnerability (Ref. 59153
): Low vulnerability (10 of 100) .