Actinopteri (ray-finned fishes) > Synbranchiformes
(Spiny eels) > Mastacembelidae
Etymology: Macrognathus: Greek, makros = great + Greek, gnathos = jaw (Ref. 45335). More on author: Hora.
Environment: milieu / climate zone / depth range / distribution range
Freshwater; demersal; pH range: 7.0 - ? ; dH range: 15 - ?; depth range - m (Ref. ), usually - m (Ref. ). Tropical; 24°C - 27°C (Ref. 13371)
Asia: Mekong and Chao Phraya basins, southeastern Thailand, Malay Peninsula and Sumatra, Indonesia.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 20.0 cm SL male/unsexed; (Ref. 57235)
Morphology | Morphometrics
(total): 26 - 30. Differs from all other mastacembelids found in Myanmar and Thailand in having body with a series of very regular, oblique, dark bars, each with a narrow extension extending partially or entirely across abdomen, and having ripe females with a very elongate genital papillae (Ref. 39392).
Occurs in streams to peats (Ref. 57235). Found in medium to large-sized rivers and flooded fields (Ref. 12975). Nocturnal, feeding on invertebrates and small fishes (Ref. 13371). Commonly seen in aquarium trades and fish markets (Ref. 57235).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Kottelat, M., 2001. Fishes of Laos. WHT Publications Ltd., Colombo 5, Sri Lanka. 198 p. (Ref. 43281)
IUCN Red List Status (Ref. 124695)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingNutrientsMass conversion
Estimates based on models
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00331 (0.00140 - 0.00784), b=2.95 (2.76 - 3.14), in cm total length, based on LWR estimates for this Genus-body shape (Ref. 93245
Trophic level (Ref. 69278
): 4.0 ±0.61 se; based on food items.
Resilience (Ref. 120179
): Medium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): Low vulnerability (24 of 100) .