Teleostei (teleosts) > Ophidiiformes
(Cusk eels) > Bythitidae
Etymology: Grammonus: Greek, gramma = signal, mark + Greek, onos = hake.
More on author: Cohen.
Environment: milieu / climate zone / depth range / distribution range
Marine; reef-associated; depth range 5 - 11 m (Ref. 34024). Tropical
Eastern Atlantic: northern coast of the Gulf of Guinea.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 10.6 cm SL male/unsexed; (Ref. 6526)
Rare species, found on soft bottom (Ref. 34024). Viviparous (Ref. 6526).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Nielsen, J.G., D.M. Cohen, D.F. Markle and C.R. Robins, 1999. Ophidiiform fishes of the world (Order Ophidiiformes). An annotated and illustrated catalogue of pearlfishes, cusk-eels, brotulas and other ophidiiform fishes known to date. FAO Fish. Synop. 125(18):178p. Rome: FAO. (Ref. 34024)
IUCN Red List Status (Ref. 126983)
Threat to humans
Fisheries: of no interest
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingNutrientsMass conversion
Estimates based on models
Preferred temperature (Ref. 123201
): 26.1 - 28, mean 27.6 °C (based on 121 cells).
Phylogenetic diversity index (Ref. 82804
= 0.5005 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00457 (0.00174 - 0.01201), b=3.10 (2.88 - 3.32), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic level (Ref. 69278
): 3.4 ±0.5 se; based on size and trophs of closest relatives
Resilience (Ref. 120179
): High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref. 59153
): Low vulnerability (10 of 100).