Polypterus weeksii, the Weeski bichir, is a fascinating prehistoric fish with unique patterns, perfect for spacious freshwater tanks and experienced aquarists.

🐟 Polypterus weeksii – Product Description

The Polypterus weeksii, commonly known as the Weeski bichir, is an extraordinary species of bichir native to the Congo River Basin. Known for its striking spotted pattern and elongated body armored with tough ganoid scales, the Weeski bichir stands out as a prized specimen for enthusiasts of ancient fish species. Growing to approximately 14–16 inches (35–40 cm), this species combines a fascinating prehistoric appearance with hardy behavior, making it ideal for well-established freshwater aquariums with adequate space.

🌊 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 90 gallons for adult specimens

• Filtration: Moderate to strong filtration to maintain excellent water quality

• Substrate: Soft sand or fine gravel to protect sensitive barbels and skin

• Tank Setup: Include plenty of hiding spots using driftwood, rocks, and caves; dim lighting preferred to simulate natural habitat conditions

🍽️ Feeding Habits

• Diet: Carnivorous and opportunistic feeders

  • Accept live, frozen, or prepared foods such as bloodworms, earthworms, shrimp, small fish, and carnivore pellets

  • Their strong jaws and sharp teeth allow them to consume a variety of meaty foods

• Feeding Frequency: Feed once or twice daily, ideally during dusk or night when they are most active

• Feeding Tips: Drop food near the bottom or use feeding tongs to encourage natural hunting behavior

🐠 Tank Mates

• Compatible Tank Mates:

  • Larger, peaceful or semi-aggressive species like large barbs, gouramis, and robust catfish

  • Other bichir species with similar temperament and size

• Avoid:

  • Small fish that can be seen as prey

  • Highly aggressive fish that may stress or harm the Weeski bichir

  • Overcrowded tanks to reduce territorial disputes and stress

🛠️ Care and Behavior

• Temperament:

  • Semi-aggressive, territorial especially with similar species

  • Primarily nocturnal but can be active during the day in well-established tanks

  • Best kept singly or in spacious tanks if housed with conspecifics

• Behavior:

  • Capable of breathing atmospheric air via a specialized swim bladder, requiring access to the water surface

  • Slow-moving and methodical, often exploring the tank and hiding among décor

• Tank Maintenance:

  • Weekly water changes of 25–40% to keep water parameters stable and healthy

  • Monitor ammonia and nitrite closely, as bichirs are sensitive to poor water quality

• Health:

  • Generally hardy but vulnerable to infections if stressed or kept in suboptimal conditions

  • Avoid sudden changes in temperature or water chemistry

📌 Summary

The Polypterus weeksii is a captivating prehistoric fish that adds both visual appeal and intriguing behavior to large freshwater aquariums. Its distinctive spotted pattern, armored body, and hardy nature make it a favorite for advanced hobbyists who have the space and knowledge to provide proper care. When housed in a spacious, well-maintained environment with compatible tank mates, the Weeski bichir thrives and offers a unique glimpse into ancient aquatic life. Perfect for species-specific tanks or large community setups with similarly sized fish, this bichir is a rewarding addition to any serious freshwater collection.