Taxonomy & naming
Jupiaba keithi was described by Jacques Géry, Paul Planquette, and Pierre-Yves Le Bail in 1996, in an account published in Cybium 20(1): 3–36. The type locality is the Maroni River, specifically at Crique Balaté in French Guiana. The species was originally placed in the large, heterogeneous genus Astyanax as Astyanax keithi, but subsequent generic revision recognised Jupiaba as a distinct group within Characidae, and the species is now listed under that genus — accounting for the parenthetical authority in the valid binomial Jupiaba keithi (Géry, Planquette & Le Bail, 1996).
Jupiaba is a mid-sized Neotropical characid genus distributed primarily across the Guiana Shield and lower Amazon basin. Its members share a set of characters that separate them from the core Astyanax assemblage, including details of dentition and body form, though the genus-level boundaries within the broader 'Astyanax complex' have been subject to ongoing revision. Eschmeyer's Catalog of Fishes (Catalog of Fishes, CAS) is the governing authority for the valid name.
Morphology
Jupiaba keithi is a moderately slender, silvery characid reaching a reported maximum of 4 in standard length — relatively large for a Jupiaba. Like most members of the family Characidae it is laterally compressed and carries the adipose fin characteristic of characids. The body is fusiform, suited to holding position in current, and the species is described as benthopelagic — occupying the lower-to-middle water column rather than the surface.
Detailed meristic data are not available from the cache sources, but the species' close original association with Astyanax suggests the typical astyanine body plan: a single lateral line running the length of the body, small cycloid scales, and a mouth that is moderately sized and terminal. Coloration in preserved specimens is typically silvery with a lateral stripe or caudal spot, as in many small characids; live coloration details are not well documented in the available literature.
Habitat
Jupiaba keithi inhabits freshwater river and stream systems of the Guiana Shield region. Its confirmed range spans the Maroni and Mana river drainages of French Guiana, adjacent rivers in Suriname, and the Brazilian states of Pará and Amapá. The IUCN assessment records its occurrence in inland permanent rivers and streams, reflecting a preference for flowing-water environments rather than still or seasonal habitats.
FishBase notes the species is abundant in upper river reaches, counter-current zones, and calm cascades with sandy bottoms — microhabitats characterised by moderate to low current velocity over clean sand or gravel, often in the transitional zones where fast water meets slacker pools. These are oxygen-rich, typically clear or lightly tannin-stained tropical waters consistent with the Guiana Shield's generally soft, acidic river chemistry, though precise water-parameter data for this species are not documented in the available sources. The IUCN lists its population trend as stable.
Feeding
Jupiaba keithi is a tropical freshwater omnivore, as is typical of the broader Jupiaba and Astyanax assemblage. In the wild, species of this group generally feed opportunistically on small invertebrates, insect larvae, terrestrial insects fallen onto the water surface, algae, and plant material, exploiting whatever food resources are available in their riverine habitat.
Specific dietary data for J. keithi in the wild are not detailed in the available sources. Its benthopelagic habit and preference for the lower water column suggest it may forage over sandy substrates as well as in open water. In an aquarium setting it would be expected to accept standard prepared foods — flake, micro-pellets — as well as frozen and live invertebrates such as Daphnia and brine shrimp, in keeping with the feeding ecology of the genus.
Mating
Jupiaba keithi has not been documented in spawning studies in the available literature, but members of Jupiaba and the broader Astyanax relatives are egg-scattering, open-water or plant-spawning characids with no parental care. Males of such species typically engage in brief pursuit and parallel swimming with females at the moment of spawning, releasing eggs and milt into the water column or among fine-leaved vegetation.
No specific courtship behaviour unique to J. keithi has been recorded. The species is likely a continuous or seasonally opportunistic spawner, as is typical of Neotropical characids in river systems that experience a wet-dry seasonal cycle influencing water level and food availability.
Breeding
Captive breeding of Jupiaba keithi has not been documented in the available sources, and the species is uncommon in the aquarium trade. Based on the reproductive biology of closely related Jupiaba and astyanine characids generally, J. keithi would be expected to scatter small, adhesive or non-adhesive eggs among fine-leaved plants or over the substrate, with no parental care and active predation of eggs by the adults if kept together.
A standard characid breeding approach — conditioning adults on live and frozen foods, providing fine-leaved plants or a spawning mop, and separating eggs or adults promptly after spawning — would be the starting point for anyone attempting to breed this species. Egg and fry details are not documented; fry of related species typically require infusoria or commercial microfeeds as first foods before graduating to nauplii.
In the aquarium
Jupiaba keithi is rarely encountered in the ornamental fish trade and is primarily of interest to specialists in Neotropical characids or to aquarists keeping biotope setups representing French Guiana or the broader Guiana Shield. Its size — up to 4 in SL — makes it larger than the typical small tetra, and it would require a spacious aquarium with good water flow to replicate the counter-current and cascade habitats it favours in the wild.
A Guiana Shield biotope setup with a sandy substrate, moderate current, minimal planting (or fine-leaved marginal vegetation), and soft to moderately soft, slightly acidic water would suit the species' inferred requirements. It is a schooling fish by nature and should be kept in groups rather than as a solitary specimen. Specific compatibility notes are not documented, but its size and active swimming habit suggest it should be housed with similarly sized, robust tankmates rather than small, slow-moving species.
Conservation
Jupiaba keithi is assessed as Least Concern (LC) on the IUCN Red List, with the assessment published in 2022 based on an evaluation dated 20 December 2020 by Taphorn and Rodríguez-Olarte. The population is recorded as stable, and the species' distribution across multiple river systems in French Guiana, Suriname, and two Brazilian states provides a reasonable geographic buffer against localised threats.
No specific threats are identified for J. keithi in the IUCN assessment. The Guiana Shield region as a whole retains large tracts of intact rainforest and relatively low human population density compared with other parts of Amazonia, and the river systems the species inhabits are not under the same degree of pressure as some Andean or cerrado drainages. No targeted conservation actions are noted as required at present, though ongoing monitoring of Guiana Shield fish communities remains important as extractive pressures in the region slowly increase.