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> Characiformes (Characins) > Characidae (Characins; tetras) > Stevardiinae
Etymology: Knodus: Greek, knodon, -ontos = knife, sword (Ref. 45335); tiquiensis: Named for its type locality, Rio Tiquié.

Environment: milieu / climate zone / depth range / distribution range Ecología

; agua dulce bentopelágico. Tropical

Distribución Países | Áreas FAO | Ecosistemas | Ocurrencias, apariciones | Point map | Introducciones | Faunafri

South America: known only from the upper Rio Tiquié basin, upper Rio Negro basin in Brazil.

Tamaño / Peso / Age

Maturity: L_m ? range ? - ? cm
Max length : 7.3 cm SL macho / no sexado; (Ref. 75965)

Short description Claves de identificación | Morfología | Morfometría

Radios blandos dorsales (total) : 10; Radios blandos anales: 21 - 23; Vértebra: 38. Distinguished from all other species of Knodus by the presence of thickened skin forming folds covering the basal portion of the six anteriormost branched anal-fin rays and its interradial membrane. Differs also uniquely among its congeners by having the six anteriormost branched rays associated with more developed skin considerably thicker than that on the remaining anal-fin rays. Can be differentiated also from all congeners, except Knodus meridae, by the low number of branched anal-fin rays (14-16 vs. more than 17), by the presence of relatively compressed teeth (vs. teeth bulky in remaining Knodus and Bryconamericus species, with the exception of Bryconamericus deuteronoides), and the presence of a broad, silvery-gray midlateral stripe (midlateral stripe in remaining Knodus and Bryconamericus species relatively narrow) (Ref. 75965).

Found only in areas of moderate to strong current and present even in the torrential flow of waterfalls. Juveniles measuring up to 2.4 cm SL occur at sandbars marginal to waterfall pools. Feeds only on Chironomidae larvae based on 3 stomach contents (Ref. 75965).

Life cycle and mating behavior Madurez | Reproducción | Puesta | Huevos | Fecundidad | Larva

Main reference Upload your references | Referencias | Coordinador | Colaboradores

Ferreira, K.M. and F.C.T. Lima, 2006. A new species of Knodus (Characiformes: Characidae) from the Rio Tiquié, upper Rio Negro System, Brazil. Copeia 2006(4):630-639. (Ref. 75965)

IUCN Red List Status (Ref. 130435: Version 2024-2)

Least Concern (LC) ; Date assessed: 04 March 2021

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

Harmless

Human uses

FAO - Publication: search | FishSource |

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Trophic ecology
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Estimates based on models

Phylogenetic diversity index (Ref. 82804): PD₅₀ = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].

Bayesian length-weight: a=0.00955 (0.00443 - 0.02057), b=3.06 (2.88 - 3.24), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).

Nivel trófico (Ref. 69278): 3.0 ±0.4 se; based on size and trophs of closest relatives

Resiliencia (Ref. 120179): Alto, población duplicada en un tiempo mínimo inferior a 15 meses (Preliminary K or Fecundity.).

Fishing Vulnerability (Ref. 59153): Low vulnerability (10 of 100).

Knodus tiquiensis Ferreira & Lima, 2006