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Red-Bellied Piranha
Pygocentrus nattereri
Animalia›Chordata›Actinopterygii›Characiformes›Serrasalmidae
📍 Amazon, Orinoco & Paraná Basins, South America
The iconic piranha with a brilliant red-orange belly contrasting with a silver body. In captivity they are actually shy and skittish, requiring a quiet, large tank. Best kept in species groups. Illegal to own in some US states.
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Care Guide
Diet
Red-bellied piranhas are strict carnivores requiring a diet of high-quality meaty foods. Feed frozen or live fish (such as feeder fish), shrimp, and specialized carnivore pellets 2-3 times weekly. Occasional whole prey items help maintain natural feeding behaviors and dental health.
Behavior
Despite their fearsome reputation, captive piranhas are actually shy and skittish fish that require calm, quiet environments with minimal disturbance. They are schooling fish that feel most secure in groups of 5 or more, displaying reduced stress and more natural behavior when kept together. They spend most time in mid-water zones and are primarily active during dawn and dusk.
Breeding
Breeding red-bellied piranhas in captivity is extremely difficult and rarely successful in home aquariums. They require very large tanks (200+ gallons for a breeding pair), specific water conditions, and careful conditioning. Most captive specimens are wild-caught or first-generation bred, making successful reproduction uncommon.
Shipping Restrictions
Prohibited in: AK, AL, AR, AZ, CA, CO, FL, GA, HI, KY, LA, MA, ME, MS, NC, NM, NV, NY, OK, SC, TX, UT, VA, WA
This is general information, not legal advice, and may be incomplete or out of date. Rules vary by state and locality and change over time — always confirm the current regulations with your state wildlife or agriculture agency before buying, selling, or shipping this species.
Tank Mates
Similar size and water requirements, but predatory nature of piranhas makes this risky; only in very large, heavily planted tanks
Large, robust fish that can coexist with piranhas in spacious tanks, but requires 200+ gallons and careful monitoring
Bottom-dwelling scavenger that avoids piranhas; helps maintain tank cleanliness without competing for food
Nocturnal bottom-dweller that occupies different water zones; armored body provides some protection
Hardy plant that provides cover and reduces stress; piranhas rarely damage established plants
Common Diseases
Fin Rot
Frayed, discolored, or deteriorating fins; white or black edges on fin tissue
Perform 25% water changes, improve water quality, treat with antibacterial medication if severe; ensure tank is not overcrowded
Ich (Ichthyophthirius multifiliis)
White spots on body and fins, flashing against objects, rapid breathing, lethargy
Raise temperature gradually to 28-30°C, treat with ich medication, perform daily water changes; quarantine affected fish if possible
Bacterial Infection
Open sores, cloudy eyes, swollen body, loss of appetite, torn fins
Improve water quality immediately, perform frequent water changes, treat with broad-spectrum antibacterial medication
Stress-Related Illness
Loss of appetite, hiding, faded coloration, erratic swimming, weakened immune response
Reduce tank disturbances, maintain stable water parameters, ensure adequate group size (minimum 5), provide dense vegetation for cover
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Quick Facts
- pH
- 5.5–7.5
- diet
- carnivore/fish/meat
- maxSize
- 13 inches
- minTankSize
- 100 gallons
- temperature
- 75–82°F (24–28°C)
Temperature
75–82°F
24–28°C