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Actinopterygii (ray-finned fishes) > Characiformes (Characins) > Characidae (Characins) > Incertae sedis
Etymology: Astyanax: The name of Astyanax, Hector´s son in the Greek mithology (Ref. 45335); ajuricaba: Named for Ajuricaba, paramount chief of the Manau Indians, formerly inhabited in the middle rio Negro area; led an unsuccessful attempt to resist the assaults of Portuguese slavers; averted a trial as a rebel by plunging in shackles into rio Negro waters.

Environment / Climate / Range Ecology

Freshwater; benthopelagic. Tropical, preferred ?

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South America: rio Negro, rio Solimões, and rio Tapajós basins, Amazon basin in Brazil.

Size / Weight / Age

Maturity: L_m ? range ? - ? cm
Max length : 9.5 cm SL male/unsexed; (Ref. 81201)

Short description Morphology | Morphometrics

Dorsal soft rays (total): 11; Anal soft rays: 27 - 31; Vertebrae: 36 - 37. Distinguished from all species of the genus and from all remaining characids by having a unique color pattern consisting of the combination of presence of a conspicuous, narrow dark midlateral stripe, a single elongated humeral spot, and upper caudal-fin lobe and middle caudal-fin rays dark, with a clear, rounded ocellated spot present dorsally at anterior third of caudal-fin lobe (Ref. 81201).

Collected from a black-water, terra-firme forest stream about 4-5 m wide and 0.5-1.0 m deep, with a predominantly sandy bottom. Also found in a large oxbow lake (Ref. 81201).

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Main reference Upload your references | References | Coordinator | Collaborators

Marinho, M.M.F. and F.C.T. Lima, 2009. Astyanax ajuricaba: a new species from the Amazon basin in Brazil (Characiformes: Characidae). Neotrop. Ichthyol. 7(2):169-174. (Ref. 81201)

IUCN Red List Status (Ref. 109396)

Not Evaluated

CITES (Ref. 94142)

Not Evaluated

Threat to humans

Harmless

Human uses

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Estimates of some properties based on models

Phylogenetic diversity index (Ref. 82805): PD₅₀ = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].

Bayesian length-weight: a=0.01230 (0.00551 - 0.02747), b=3.08 (2.89 - 3.27), based on LWR estimates for this (Sub)family-body shape (Ref. 93245).

Trophic Level (Ref. 69278): 2.8 ±0.3 se; Based on size and trophs of closest relatives

Resilience (Ref. 69278): High, minimum population doubling time less than 15 months ().

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

Entered by Torres, Armi G.

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Astyanax ajuricaba Marinho & Lima, 2009