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Red-bellied piranha — left-facing adult, AI-generated illustration

Red-bellied piranha

Pygocentrus nattereri

Deep silver-grey body with an orange-red underside

Adult red-bellied forms are deep-bodied with prominent jaws; colour varies with age and locality.

Adult length
Up to 50 cm (standard length, without the tail fin)
Water temperature
24–28 °C
pH
5.5–7.5
Hardness
2–12 dGH
Natural habitat
Common in creeks and interconnected ponds, also occurring in productive river waters.

Adult size and biting risk require protected equipment and careful maintenance.

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Appearance and identification

The shoulder spot is smaller or absent compared with P. cariba.

Same-species behaviour

Juveniles aggregate; adults form looser hierarchies, rather than continuously hunting as a pack.

Space requirements

Suited only to public or exceptionally large private systems with substantial filtration.

Diet and feeding

An opportunistic feeder taking animal foods and some plant material.

Compatibility limits

A dedicated setup is preferable; group size does not guarantee compatibility.

Aquarium environment

Plants may be eaten, particularly around spawning.

Sources

www.fishbase.se ↗ 2026-10-25

www.seriouslyfish.com ↗ 2026-10-22

www.aquariumglaser.de ↗ 2026-10-22

api.gbif.org ↗ 2026-10-22

PeekFish · Ornamental fish

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