Taxonomy & naming
Cyphocharax aninha was described by Wosiacki & Miranda in 2014, one of many curimatid species formally recognised only in the last two decades as taxonomists worked through the Amazon basin's poorly resolved detritivore fauna. It belongs to the genus Cyphocharax within the family Curimatidae, part of the broader superfamily that also contains Prochilodus and the true Curimata — all small-to-medium characins built around a toothless, sediment- and biofilm-grazing lifestyle rather than the predatory or frugivorous habits of piranhas and pacus in the neighbouring family Serrasalmidae.
The type locality is the Rio Mopeco, a left-bank tributary of the Rio Parú in the state of Pará, Brazil, placing the species firmly within the Amazon basin. As with many recently described curimatids, C. aninha is known primarily from its original description and subsequent listing in taxonomic databases; the Catalog of Fishes (Eschmeyer, California Academy of Sciences) is the governing authority for the valid combination, and nothing in the available record suggests any subsequent reclassification or synonymy for this name.
Morphology
Cyphocharax aninha is a genuinely small fish even by the standards of minor characins: FishBase lists a maximum published length of 1.5 in standard length for both male and unsexed specimens, with no larger female size on record. That places it among the smallest members of a genus that already runs small relative to its Curimatidae relatives.
Beyond the size record and its placement in a benthopelagic, freshwater, tropical lifestyle, detailed morphological description is limited in publicly available sources. Like other Cyphocharax, it can be expected to share the family's general body plan — a slim, silvery, laterally compressed shoaling fish with a small, subterminal or ventrally positioned mouth adapted for scraping detritus, algae and biofilm rather than a jaw built for seizing prey. Data on colour pattern, fin counts and other diagnostic detail specific to this species is sparse in the sources available here, and this account does not speculate beyond what is documented.
Habitat
Cyphocharax aninha is documented from the Rio Mopeco, a tributary of the Rio Parú, within the Amazon River basin in Pará, Brazil. FishBase characterises the species as benthopelagic and freshwater, tropical in distribution — consistent with a small tributary stream in the lowland Amazon rather than a large main-channel river.
Specific water chemistry data for C. aninha itself is not available in the cache. A related species in the same genus, Cyphocharax multilineatus, is documented inhabiting warm water in the range of roughly 23–27 degrees Celsius at neutral to slightly acidic pH, which is broadly consistent with typical Amazon tributary conditions, but this is offered as genus-level context rather than a confirmed reading for C. aninha itself.
Feeding
Curimatidae as a family are characteristic detritus-grazers: most species in this group, including the broader genus Cyphocharax, feed by sifting or scraping fine organic sediment, algae and biofilm from the substrate rather than hunting prey or taking large food items. No species-specific dietary study of C. aninha is available in the sources consulted here, but its family placement and its very small adult size are both consistent with this detritivorous, low-impact grazing lifestyle rather than anything predatory or opportunistic.
In a hypothetical aquarium setting, a fish built for this niche would be expected to do best on fine, sinking foods, algae-based wafers and general detrital grazing opportunities rather than large meaty items — though the species is not established in the trade and this is inference from its family, not a documented care record.
Mating
No courtship or pairing behaviour has been documented for Cyphocharax aninha in the sources available here. Data on this species is sparse to the point that even basic reproductive biology beyond family-level generalisation cannot be responsibly reported.
Breeding
Breeding biology for Cyphocharax aninha specifically is not documented in the available sources, and this account does not assign it a breeding mode by inference alone. Within the wider genus, a related species, Cyphocharax multilineatus, has been reported as a substrate egg-scatterer associated with vegetation, and Curimatidae generally are not known as a family that is frequently or deliberately bred in captivity — they are grazers of modest hobby interest rather than trade staples with an established breeding protocol. Whether C. aninha itself has ever been spawned in captivity is unrecorded here; the honest answer is that this is unknown, not that it follows a documented pattern.
In the aquarium
Cyphocharax aninha does not appear to be an established aquarium species — it is a scientifically described but hobby-obscure curimatid known from a single small Amazon tributary, and no aquarium care record was found in the sources consulted here. At a maximum recorded size of 1.5 in SL, it would in principle suit only a very small, peaceful setup among fine-substrate grazers if it were ever available, but this is speculative extrapolation from its size and family, not a documented care history, and it should not be presented to readers as an available or proven aquarium fish.
The more useful takeaway for this species is representational: not every characin in the Amazon is a piranha, a pacu or a showy tetra. The great majority of Neotropical characin diversity, including this genus, is made up of small, quiet grazing fish like C. aninha that rarely if ever enter the trade but form the base of the food web these rivers depend on.
Conservation
Cyphocharax aninha is assessed by the IUCN Red List as Least Concern, a status corroborated by FishBase. As a narrow-range species known from a single documented tributary system within the vast Amazon basin, its conservation picture is typical of many recently described, data-poor Amazonian fishes: not currently flagged as threatened, but also not the subject of extensive population monitoring. There is no indication in the available sources of a targeted fishery or aquarium trade pressure on this species, which is consistent with its status as a scientifically documented but commercially unexploited curimatid.