Myxini (hagfishes) > Myxiniformes
(Hagfishes) > Myxinidae
(Hagfishes) > Myxininae
Etymology: Nemamyxine: Greek, nema, -atos = filament + Greek, myxinos, word used by Linne, slime fish (1846) (Ref. 45335).
Environment: milieu / climate zone / depth range / distribution range
Marine; bathydemersal; non-migratory; depth range 80 - 800 m (Ref. 31276). Deep-water
Southwest Atlantic: off Argentina and southern Brazil.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 40.0 cm TL male/unsexed; (Ref. 31276)
Morphology | Morphometrics
Diagnosis: Body color light to dark brown, ventral finfold with unpigmented margin. Body extremely slender, depth about 2.4-2.9% of TL. Origin of the ventral finfold well anterior to pharyngocutaneous duct (PCD). Gill pouches 8 pairs. Rostrum rounded. A 3-cusp multicusp on anterior set, a 2-cusp multicusp on posterior set of cusps; total cusps count 32-38. Total pores 124-148 (Ref. 39281).
Specimens were caught in winter months, between May and August, a period of lower water temperature due to the Falklands Current influence (Ref. 39281).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Copulatory organ absent. The gonads of hagfishes are situated in the peritoneal cavity. The ovary is found in the anterior portion of the gonad, and the testis is found in the posterior part. The animal becomes female if the cranial part of the gonad develops or male if the caudal part undergoes differentiation. If none develops, then the animal becomes sterile. If both anterior and posterior parts develop, then the animal becomes a functional hermaphrodite. However, hermaphroditism being characterised as functional needs to be validated by more reproduction studies (Ref. 51361 ).
Fernholm, B., 1998. Hagfish systematics. p. 33-44. In J.M. Jørgensen, J.P. Lomholt, R.E. Weber and H. Malte (eds.) The biology of hagfishes. Chapman & Hall, London. 578 p. (Ref. 31276)
IUCN Red List Status (Ref. 120744)
CITES (Ref. 118484)
Threat to humans
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates based on models
Preferred temperature (Ref. 115969
): 8.8 - 16.3, mean 14.5 (based on 25 cells).
Phylogenetic diversity index (Ref. 82805
= 0.7500 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00115 (0.00045 - 0.00296), b=3.03 (2.80 - 3.26), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic Level (Ref. 69278
): 3.3 ±0.6 se; Based on size and trophs of closest relatives
Resilience (Ref. 120179
): Low, minimum population doubling time 4.5 - 14 years (Fec assumed to be <100).
Vulnerability (Ref. 59153
): Low to moderate vulnerability (32 of 100) .