Classification / Names
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Environment: milieu / climate zone / depth range / distribution range
Freshwater; benthopelagic. Tropical
Asia: Kalu River basin in Sri Lanka.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 3.0 cm SL male/unsexed; (Ref. 94541); 2.7 cm SL (female)
Morphology | Morphometrics
soft rays: 9;
Vertebrae: 28. Rasboroides nigromarginatus is distinguished from its congener R. vaterifloris by having the dorsal profile of the head slightly concave (vs. approximately straight) behind the level of the eye in males; base of the pelvic fin closer to origin of anal fin than to base of pectoral fin (vs. located midway between pectoral-fin base and anal-fin origin); and dorsal margin of operculum with a deep indentation (vs. dorsal margin of operculum approximately straight). Male R. nigromarginatus differs from male R. vaterifloris by possessing a lesser interorbital width (17-22 % HL, vs. 29-33) and a lesser internarial width (11-17 % HL, vs. 19-21), while females differ by having a lesser anal-fin depth (17.4-22.7 % SL, vs. 23.5-24.8), a lesser interorbital width (16-21 % HL, vs. 25-33), a lesser caudal-peduncle depth (10.4-12.3 % SL, vs. 12.4-13.4) and a greater caudal-peduncle length (21.1-25.0 % SL, vs. 18.6-21.2). It can be differentiated from R. pallidus and R. rohani by having the dorsal-fin origin 1 scalewidth (vs. 3 scale widths) behind pelvic-fin origin; and a body depth of 26.9-33.0 % SL (vs. 33.0-37.5 in R. pallidus and 33.3-40.0 in R. rohani) (Ref. 94541).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Batuwita, S., M. de Silva and U. Edirisinghe, 2013. A review of the danionine genera Rasboroides and Horadandia (Pisces: Cyprinidae), with description of a new species from Sri Lanka. Ichthyol. Explor. Freshwat. 24(2):121-140. (Ref. 94541)
IUCN Red List Status (Ref. 120744)
CITES (Ref. 118484)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates based on models
Phylogenetic diversity index (Ref. 82805
= 0.5625 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00724 (0.00330 - 0.01589), b=3.07 (2.89 - 3.25), 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. 120179
): High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): Low vulnerability (10 of 100) .