Classification / Names
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Actinopterygii (ray-finned fishes) > Gymnotiformes
(Knifefishes) > Apteronotidae
Etymology: Sternarchorhynchus: Greek, sternon = sternon, + Greek, archos = anus + Greek, rhyngchos = snout (Ref. 45335); gnomus: From the Latin gnomus, meaning dwarf, in allusion to its small body size.
Environment: milieu / climate zone / depth range / distribution range
Freshwater; benthopelagic; pH range: 6.6 - 7.6. Tropical; 28°C - ? (Ref. 56955)
South America: Lower Río Caroni, Venezuela.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 15.2 cm TL male/unsexed; (Ref. 84053); 13.4 cm TL (female)
Morphology | Morphometrics
soft rays: 159 - 177. Distinguished from all congeners by the following combination of characters: snout strongly curved; head and mid-dorsum as dark as dorsolateral areas; anal and pectoral fins translucent, without conspicuous distal dark margins; scales present along anterodorsal region of body; 6-7 scales above lateral line at mid-body; 159-177 total anal-fin rays; five branchiostegal rays; greatest body depth 9.3-11.4% of length to end of anal fin; snout to anus 58.4-77.6% of length to end of anal fin; pre-pectoral fin length 34.8-41.0% of HL; snout length 57.6-65.4% of HL; head depth at nape 39.7-44.9% of HL; postocular distance 36.9-41.6% of HL; eye diameter 4.1-7.6% of HL; internarial distance 2.7-7.0% of HL; branchial opening 9.5-12.3% of HL; tail length 10.1-17.4% of length to end of anal fin; tail depth 8.3-13.8% of caudal length (Ref. 56955).
Inhabits channel with clear water (Ref. 56955); visibility of approximately 2 m and the pH ranging from 6.6-7.6 (Ref. 84053). Feeds on insects such as chironomids, ephemeropterans and trichopterans (Ref. 56955).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
de Santana, C. D. and R.P. Vari, 2010. Electric fishes of the genus Sternarchorhynchus (Teleostei, Ostariophysi, Gymnotiformes); phylogenetic and revisionary studies. Zool. J. Linn. Soc. 159:223-371. (Ref. 84053)
IUCN Red List Status (Ref. 120744)
CITES (Ref. 115941)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates of some properties based on models
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00347 (0.00138 - 0.00871), b=3.09 (2.87 - 3.31), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic Level (Ref. 69278
): 3.2 ±0.3 se; Based on size and trophs of closest relatives
Resilience (Ref. 69278
Vulnerability (Ref. 59153
): Low vulnerability (10 of 100) .