Polypterus delhezi, the Delhezi bichir, is a striking, hardy prehistoric fish perfect for large freshwater tanks with experienced aquarists.

🐟 Polypterus delhezi – Product Description

The Polypterus delhezi, commonly known as the Delhezi bichir, is a fascinating prehistoric-looking freshwater fish native to the Congo Basin in Central Africa. Recognizable by its eel-like body, armored scales, and distinctive dorsal finlets, this species is a favorite among advanced hobbyists who appreciate its unique appearance and hardy nature. Growing up to 12 inches (30 cm), Delhezi bichirs are ideal for large community tanks or species-specific setups where their semi-aggressive temperament can be managed.

🌊 Water Conditions

• Temperature: 75–82°F (24–28°C)

• pH Range: 6.0 – 7.5 (slightly acidic to neutral)

• Hardness: 5–15 dGH

• Tank Size: Minimum 75 gallons for adults to provide ample swimming space

• Filtration: Moderate to strong filtration with gentle water flow preferred

• Substrate: Sand or smooth gravel to protect delicate barbels and ventral surface

• Tank Setup: Provide plenty of hiding spots with driftwood, rocks, and caves; low to moderate lighting mimics natural habitat

🍽️ Feeding Habits

• Diet: Carnivorous and opportunistic feeders

  • Accept a variety of meaty foods such as bloodworms, earthworms, shrimp, krill, and high-quality sinking pellets or wafers

  • Will also consume small fish or invertebrates, so caution is advised with tankmates

• Feeding Frequency: 1–2 times daily, preferably in the evening as they are mostly nocturnal or crepuscular feeders

• Feeding Tips: Use feeding tongs or drop food near the substrate to stimulate natural hunting behavior

🐠 Tank Mates

• Compatible Tank Mates:

  • Larger peaceful to semi-aggressive fish such as large tinfoil barbs, large cichlids, and robust catfish

  • Other bichir species with similar size and temperament

• Avoid:

  • Very small fish (may be viewed as prey)

  • Highly aggressive species that may stress or injure the bichir

  • Fish that occupy the same bottom-dwelling niche excessively, to reduce competition

🛠️ Care and Behavior

• Temperament:

  • Semi-aggressive and territorial, especially with conspecifics or similar-shaped fish

  • Primarily nocturnal but may show activity during the day

  • Requires peaceful, patient tankmates that can tolerate its occasional assertiveness

• Behavior:

  • Known for breathing atmospheric air via a modified swim bladder; must have access to the water surface

  • Slow-moving but powerful swimmers with excellent camouflage

• Tank Maintenance:

  • Weekly water changes of 25–40% recommended to maintain water quality

  • Monitor ammonia and nitrite levels closely; bichirs are sensitive to poor water conditions

• Health:

  • Generally hardy but vulnerable to bacterial infections if stressed or kept in poor water conditions

  • Avoid sudden temperature changes and maintain consistent water parameters

📌 Summary

The Polypterus delhezi is a stunning addition for aquarists interested in ancient fish species with a unique appearance and engaging behavior. While hardy and relatively easy to care for compared to other bichirs, it requires a spacious, well-maintained tank and compatible tankmates to thrive. Its nocturnal feeding habits and semi-aggressive temperament make it a captivating centerpiece for large freshwater community or species-specific tanks. With proper care, the Delhezi bichir can live for many years, offering a window into prehistoric aquatic life right in your home aquarium.