Actinopteri (ray-finned fishes) > Siluriformes
(Catfishes) > Siluridae
Etymology: Kryptopterus: Greek, kryptos = hidden + Greek, pteron = wing. Fin (Ref. 45335); hesperius: Named for its western distribution in Thailand.
Environment: milieu / climate zone / depth range / distribution range
Freshwater; benthopelagic; depth range - m (Ref. ), usually - m (Ref. ). Tropical; 0°C -
Asia: Mae Khlong River drainage in Thailand.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 24.9 cm SL male/unsexed; (Ref. 42937)
Morphology | Morphometrics
soft rays: 78 - 79;
Vertebrae: 57. Head length 14.0-15.2% SL; head width 12.2-12.3% SL; body depth at anus 23.0-23.8% SL; eye diameter 25.6-27.9% HL; vomerine teeth present in single crescentic band; a distinct nuchal concavity; and mandibular barbels reaching beyond anterior base of anal fin. Fins hyaline, with small dark-brown spots occasionally present (Ref. 42937).
Occurs in mainstream (Ref. 58784). Feeds on insects and small shrimps (Ref. 58784).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Ng, H.H., 2002. Descriptions of two new species of Kryptopterus from Thailand and Borneo in the K. limpok species group (Teleostei: Siluridae). Ichthyol. Explor. Freshwat. 13(1):67-72. (Ref. 42937)
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=0.00589 (0.00293 - 0.01185), b=3.00 (2.83 - 3.17), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic level (Ref. 69278
): 4.1 ±0.7 se; based on size and trophs of closest relatives
Resilience (Ref. 120179
): Medium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): Moderate vulnerability (38 of 100) .