Classification / Names
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Actinopterygii (ray-finned fishes) > Cyprinodontiformes
(Rivulines, killifishes and live bearers) > Rivulidae
Etymology: kayabi: The specific name kayabi is in reference to the name of an indigenous tribe (Tupi group) formerly inhabiting a vast region of the Teles Pires drainage, Tapajós river basin, central Brazil. More on author: Costa.
Environment: milieu / climate zone / depth range / distribution range
Freshwater; benthopelagic; pH range: 5.7 - 6.0. Tropical
South America: middle and upper reaches of the Tapajós river basin in Brazil.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 3.0 cm SL male/unsexed; (Ref. 76937); 2.9 cm SL (female)
Morphology | Morphometrics
soft rays: 12 - 14;
Vertebrae: 30 - 31. Differs from all other species of the subgenus Melanorivulus by the possession of the following combination of characters: flank with red marks arranged in chevron-like pattern with vertex on the ventral part of the flank; pelvic fin usually with 6 rays, or sometimes 7 when including a rudimentary ray; scales in the longitudinal series 31-33; dorsal portion of the caudal fin in females with a horizontal series of white spots; pectoral fin with 13 rays; caudal fin with 28-31 rays; and flank in both sexes with conspicuous red bars (Ref. 76937).
Inhabits shallow portions of streams and swamps, usually about 0.10-0.30 m deep, with clear water (Ref. 76937).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Costa, W.J.E.M., 2007. Rivulus kayabi, a new killifish from the Tapajós river basin, southern Brazilian Amazon (Cyprinodontiformes: Rivulidae). Ichthyol. Explor. Freshwat. 18(4):345-350. (Ref. 76937)
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=0.00479 (0.00195 - 0.01175), b=3.14 (2.93 - 3.35), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic Level (Ref. 69278
): 3.1 ±0.4 se; Based on size and trophs of closest relatives
Resilience (Ref. 69278
): High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): Low vulnerability (10 of 100) .