Taxonomy & naming
Leporinus vanzoi was described in 2005 by the Brazilian ichthyologists Heraldo A. Britski and José Carlos Garavello, part of a wave of Leporinus descriptions from the Tapajós and other Amazonian tributaries in the early 2000s as the genus's real diversity became clearer through targeted river-basin surveys. It sits in the family Anostomidae — the headstanders — within the order Characiformes, and the Catalog of Fishes (Eschmeyer, California Academy of Sciences) recognises it as a valid species within the large genus Leporinus, which numbers well over 80 species across South America.
The genus name Leporinus derives from the Latin lepus ("hare"), an old reference to the group's protruding incisor-like front teeth, and vanzoi is a patronym, though the cache consulted here does not preserve the specific dedication; Britski and Garavello named several Tapajós-basin species for colleagues and collectors active in Brazilian ichthyology at the time. As with many recently split Leporinus, identification of L. vanzoi rests on fine details of body proportions, fin-ray counts and colour-pattern markings distinguishing it from superficially similar congeners sharing the same drainage.
Morphology
Leporinus vanzoi is a small member of its genus. The type series spans a holotype of 2.5 in standard length, paratypes of 2–2.5 in SL, and other examined specimens reaching 3–3.5 in SL — meaning even the largest known individuals measure under 4 in SL, distinctly smaller than well-known aquarium Leporinus such as L. fasciatus that commonly exceed 10–12 in. It carries the typical Anostomidae body plan: an elongate, moderately compressed body, a small subterminal mouth set beneath a pointed snout, and the forward-projecting incisiform teeth that give the genus its hare-toothed name.
Detailed colour-pattern description was not available from the sources consulted here; like many Tapajós Leporinus it likely shows a banded or blotched pattern along the flanks typical of the genus, but this should be treated as inference from relatives rather than a confirmed field mark for this species specifically.
Habitat
Leporinus vanzoi is known from the Rio Tapajós basin in Pará state, Brazil, part of the southern Amazon drainage. Its type locality is the Rio Tapajós at Cachoeira Lombo de Anta, a rapids/waterfall reach typical of the rocky, fast-flowing stretches found through much of the Tapajós system above its lower, more sluggish reaches. FishBase describes it as a benthopelagic, tropical freshwater fish, consistent with a species that grazes over submerged substrate in flowing water rather than one restricted to still floodplain habitat.
Specific water chemistry data for this species was not found in the sources consulted here. The wider Tapajós basin runs mostly clearwater to lightly stained, moderately warm and slightly acidic to circumneutral, but precise figures for L. vanzoi's home reaches were not documented in the cache and should not be assumed without confirmation.
Feeding
Direct dietary data for Leporinus vanzoi was not found in the sources consulted here. By genus, Leporinus are grazers and aufwuchs feeders that work algae and biofilm from rocks, wood and plant surfaces in their characteristic oblique, head-down posture, supplementing this with soft plant material, detritus and small invertebrates picked from the substrate. Given its rheophilic, rapids-associated habitat at the type locality, L. vanzoi most plausibly follows this same grazing pattern, browsing algal growth on rock and wood in flowing water, though this is inference from the genus rather than species-specific evidence.
In the absence of husbandry accounts, a keeper should assume the genus-typical diet: a vegetable-forward feed of algae wafers, blanched vegetables and spirulina-based foods, supplemented with occasional small live or frozen protein, rather than a primarily carnivorous ration.
Mating
No courtship or spawning behaviour specific to Leporinus vanzoi was found in the sources consulted here, and data is sparse even at the genus level. External sexual dimorphism was not documented for this species; across Leporinus generally, sexes are often difficult to distinguish outside of breeding condition, with little consistent difference in colour or fin shape reported.
Breeding
Leporinus as a genus are egg-scatterers, and a small number of species — including some Leporinus and the related Anostomus — have been reported to spawn in aquaria over well-planted, weedy substrate, with a handful of species farmed commercially; but successful home breeding is uncommon across the genus as a whole. No breeding reports specific to Leporinus vanzoi were found in the sources consulted here, and there is no indication it has been spawned in the hobby. There is no parental care documented for the genus — eggs are scattered and abandoned, with no nest-guarding or brooding behaviour.
Given the complete absence of aquarium or aquaculture literature on this species, it should be treated as essentially unbred in captivity; a prospective breeder would be working from genus-level generalities rather than any established protocol for L. vanzoi itself.
In the aquarium
Leporinus vanzoi is not established in the aquarium trade, and dedicated care information for the species could not be found in the sources consulted here. Its modest known size — under 4 in SL by the type material — would in principle make it more manageable than the larger banded Leporinus regularly sold in the hobby, but the genus's well-earned reputation for nippiness and territoriality as fish mature should not be assumed absent simply because this particular species is undocumented; related Leporinus and Anostomus are notorious fin-nippers that do best either in adequate numbers to diffuse aggression or kept alone, and many also graze on soft aquarium plants.
A keeper encountering this species — most likely only through specialist Amazonian imports tied to Tapajós collection — should plan for a rheophilic setup with strong flow, oxygenation and hard, structured decor (rock and driftwood) reflecting its rapids-associated type locality, robust plant-safe or plant-free furnishing given the genus's grazing habits, and caution about tankmates given the family's nipping tendencies. Given how little is documented, a keeper should treat any specific husbandry claim for L. vanzoi beyond these genus-level cautions with real skepticism.
Conservation
The IUCN Red List assesses Leporinus vanzoi as Least Concern, an assessment dated November 2018. This reflects its status within a defined Amazonian basin (Tapajós) without documented major threats identified in the assessment consulted here, though as a range-restricted basin endemic it would be worth monitoring against the broader pressures facing the Tapajós system, including hydroelectric damming and mining-linked water-quality change, which affect many narrowly distributed fish in that drainage even where a species is not itself flagged as threatened.
The species is not a significant part of the aquarium trade and there is no indication of commercial collection pressure specific to L. vanzoi in the sources consulted here.