Care guide · Freshwater · fish

Banded leporinus

Leporinus fasciatus

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Leporinus fasciatus is a large South American anostomid known for dark vertical body bands. Juveniles have fewer bands than adults, so identifying a young shop fish can be difficult. The species is also often confused with Leporinus affinis. An adult is not suited to an ordinary community aquarium: the minimum tank length, jumping behaviour and potential territorial conflict demand substantial planning. Ask about expected adult size and confirm that the aquarium is mature; do not buy the fish as a temporary resident for a smaller tank.

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At a glance

Temperature: 20–28 °C
pH: 5.0–7.5
GH: 1–15 °dGH
Aquarium length: At least 210 cm
Minimum aquarium volume: At least 756 L
Adult size: At least 27 cm
Group size: At least 6 individuals
Temperament: Territorial

About this species

Seriously Fish reports 270 mm standard length; a US government screening report cites 370 mm total length. Standard length ends at the tail base, while total length includes the caudal fin, so these measurements are not directly comparable. They do confirm a large fish. Its banding changes as it grows and becomes more numerous according to the specialist account; do not identify it only by counting a juvenile’s bars.

Natural habitat

The species was described from Suriname and is reported across much of the Amazon and Orinoco systems and coastal drainages of Guyana, Suriname and French Guiana. It uses varied habitats, including main channels, smaller tributaries, oxbows and floodplain lakes. During the wet season it may enter flooded forest. This wide habitat range does not mean that every aquarium needs one fixed current or water colour.

Aquarium and layout

Seriously Fish says a footprint of 210 × 60 cm, about 756 litres at its reference height, should be the smallest considered; tank length should be at least around two metres. This is a very large aquarium. Use a biologically mature system with good oxygenation and ample open swimming room. A tight-fitting lid is essential because anostomids are powerful jumpers. Plants may be eaten.

Water conditions

The specialist profile gives 20–28°C, pH 5.0–7.5 and GH 1–15 dGH. Other sources provide broader environmental ranges; these are not automatically aquarium targets. Aim for stable conditions and gradual acclimation. A mature, effective filter system is important; do not introduce the fish to a newly started aquarium. Check water quality after feeding and maintenance.

Behaviour and group size

This species can be quarrelsome with conspecifics when kept in small numbers. Seriously Fish describes two options: one specimen in a carefully selected community, or six or more in a very large aquarium. Much smaller fish may be eaten. Tankmates should be robust, large enough as adults and compatible in activity. Matching water values alone does not prevent territorial problems or predation.

Feeding

Leporinus species naturally feed on algae, invertebrates and organic matter. Stomach contents reported for L. fasciatus also include fruit, seeds and aufwuchs, and in one case a small fish. In aquaria it usually accepts varied food. Avoid a diet dominated by high-protein foods; rotate suitable vegetable, algae and other complete foods. Offer measured portions and remove leftovers.

Breeding

Seriously Fish says aquarium breeding is unrecorded. A government report cites observations of reproduction in the wild, but these do not provide a reliable home protocol. This guide therefore does not invent a spawning trigger, pair behaviour, egg count or fry schedule. Anyone considering a breeding attempt needs specialist knowledge and a very large dedicated system; success is not established in the aquarium source consulted.

Sources & review

This care guide draws on several specialist sources and was last checked on 16 October 2026.

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