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Redtail Catfish - (Phractocephalus Hemioliopterus)
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Redtail Catfish - (Phractocephalus Hemioliopterus)

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Redtail Catfish - (Phractocephalus Hemioliopterus)
Fish Details, Description and Information Below:

🐟 Redtail Catfish – (Phractocephalus hemioliopterus) – Massive Freshwater Predatory Catfish for Sale

The Redtail Catfish (Phractocephalus hemioliopterus) is one of the most recognizable freshwater giants in the aquarium hobby, known for its bold red tail, long whiskers, and powerful build. Native to the Amazon, Orinoco, and Essequibo River basins of South America, this species grows extremely large—often exceeding 4 feet (120 cm) in length—and requires enormous aquariums or private ponds.

While their appearance is captivating, Redtail Catfish are not suitable for the average home aquarium. They are predatory, produce large amounts of waste, and need thousands of gallons of water to live a healthy life.


🔎 Quick Facts – Redtail Catfish (Phractocephalus hemioliopterus)

  • 📛 Common Names: Redtail Catfish, RTC
  • 🔬 Scientific Name: Phractocephalus hemioliopterus
  • 🌍 Origin: Amazon, Orinoco, and Essequibo River basins – South America
  • 🎨 Appearance: Dark brown/black back, white belly, and bright red/orange tail fin
  • 📏 Max Size: 4–5 feet (120–150 cm)
  • 💎 Availability: Common in the trade but often sold to aquarists who cannot house them long term

⚠️ Important Ethical Note

  • The Redtail Catfish is a fish that 99% of aquarists cannot house for life.
  • Keeping one in a 125–300 gallon tank is not adequate—they require ponds or aquariums exceeding 1,000+ gallons for proper long-term care.
  • Many end up stunted, rehomed, or surrendered because of space requirements.
  • The same applies to other giant species like Black Pacu, Tiger Shovelnose Catfish, and Piraiba Catfish.

😇 Behavior & Temperament

  • ⚔️ Predatory; will swallow any fish that fits in its mouth
  • 🐟 Territorial with other large bottom dwellers
  • 🪵 Intelligent and quickly learns feeding schedules
  • 🚫 Not compatible with small or delicate tankmates

🏠 Aquarium & Tank Requirements

  • 📦 Minimum Tank Size: 1,000+ gallons (indoor pond or massive aquarium)
  • 🪵 Sandy or smooth gravel substrate
  • 🌿 Large driftwood or boulders for cover
  • 💡 Moderate lighting
  • 🌊 Powerful filtration to handle high waste output

💧 Water Parameters – Redtail Catfish Care

  • 🌡️ Temperature: 72–80°F (22–27°C)
  • ⚗️ pH: 6.0–7.5
  • 💧 Hardness: Soft to moderately hard water

🍽️ Diet – Carnivorous Predator

  • 🐟 Whole market fish, shrimp, and shellfish
  • 🦐 Large pellets for carnivorous catfish
  • 🪱 Earthworms and other meaty foods
  • 🚫 Avoid feeder goldfish due to poor nutrition and disease risk

📋 Redtail Catfish Care Overview Table

Feature Details
🌍 Origin Amazon, Orinoco, Essequibo River basins
📏 Max Size 4–5 feet (120–150 cm)
😇 Temperament Predatory, territorial
🏠 Tank Size 1,000+ gallons
⚗️ pH Range 6.0–7.5
🌡️ Temperature 72–80°F (22–27°C)
🍽️ Diet Carnivorous
🎯 Ideal For Very large aquarium or pond setups only

✨ Highlight:

  • The Redtail Catfish is a beautiful yet challenging river giant that should only be kept by aquarists with the resources and space to house it properly for its entire lifespan.

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