大齿慈脂鲤 · Piabuco Tetra

Overview

Piabucus dentatus is a relatively large schooling tetra, reaching about 13 cm and spending much of its aquarium activity near the surface. It is generally peaceful, but its size and speed may unsettle smaller companions. In addition to animal foods, it consumes some filamentous red algae commonly called black brush algae.

Distribution & habitat

The range follows northern South America's coastal waters from Venezuela through Guyana, Suriname, and French Guiana to the Amazon mouth in Brazil. It occupies low-lying waters such as estuaries and floodplain streams, often in turbid, sediment-rich tributaries. Some populations occur in brackish conditions.

Aquarium setup

An aquarium around 120 × 30 × 30 cm, or 108 liters, is the minimum starting point. Dense planting is possible, though soft leaves may be nibbled. Floating plants suit its preference for the upper water layers. Sand, woody branches, roots, and leaves provide an alternative stream-style layout. Maintain good oxygenation and a moderate current.

Diet & feeding

Analyses of wild stomach contents show a diet based on small crustaceans, insects, and other bottom-dwelling animals. Captive fish take prepared food and small live or frozen items, with bloodworms particularly favored. They also graze filamentous red algae, including Audouinella. That behavior does not make algae an adequate sole diet.

Behaviour & compatibility

Similarly sized peaceful characins, cichlids, and bottom-dwelling catfishes are suitable candidates. Cyprinids, rainbowfishes, or loaches can also work when their requirements match. Small fishes may be intimidated by its rapid movement. Maintain as substantial a group as the aquarium can comfortably support to encourage natural schooling in the upper water.

Breeding

Captive breeding has not been confirmed. Egg scattering without parental care is a prediction based on its habits, rather than an established observation. A trial setup could use a separate dim aquarium with fine plants, spawning mops, or protective mesh. A sponge filter provides oxygenation without drawing in loose eggs. Slightly acidic water is a possible starting point, not a verified breeding requirement.

Group spawning or separately conditioning the sexes before pairing can be tried by analogy with other tetras. If eggs appear, removing adults would reduce possible egg predation. Incubation time is undetermined. Fry may require infusoria-sized food initially, followed by microworms or Artemia nauplii once large enough. Dim rearing conditions are a precaution borrowed from related fishes.

Notes

Members of Piabucus are rarely traded. A sales name or a chin marking alone is insufficient to establish the species.