Ansorgii Bichir: A Rare and Ancient Predator

The Ansorgii Bichir (Polypterus ansorgii) is a large, fascinating species of bichir prized by advanced aquarists for its impressive size, striking markings, and prehistoric appearance. Native to the rivers of West Africa, this rare fish is a top choice for predatory or monster fish setups, where it becomes an unmistakable centerpiece.

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Appearance

The Ansorgii Bichir is one of the largest bichir species, reaching 24–30 inches in length. It has an elongated, muscular body with a series of dorsal finlets and distinctive dark, vertical banding along its golden-brown base. Its armored scales and wide, powerful head give it an unmistakably ancient, almost dragon-like appearance.

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Behavior and Temperament

Ansorgii Bichirs are predatory but generally peaceful toward tank mates that are too large to be eaten. They are nocturnal by nature, often resting during the day and becoming more active at night. These fish are slow-moving but deliberate hunters, relying on their keen sense of smell to locate food.

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Tank Requirements

• Tank Size: 150+ gallons

• Water Temperature: 75–82°F

• pH Range: 6.5–7.5

• Water Hardness: 5–15 dGH

• Aquascape: Dimly lit aquariums with caves, driftwood, and open floor space

A tightly fitted lid is essential since bichirs are excellent escape artists and can breathe atmospheric air.

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Diet

Ansorgii Bichirs are carnivorous and require a protein-rich diet:

• Frozen or live foods (fish, shrimp, worms)

• Sinking carnivore pellets

• Occasional meaty treats like cut fish or prawn

Feed them at night or during low-light conditions for the best feeding response.

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Tank Mates

Due to their size and predatory nature, suitable tank mates include:

• Other large bichirs

• Arowanas

• Large catfish

• Polypterus-compatible cichlids

• Other robust monster fish

Avoid housing with small fish that can be swallowed.

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Breeding

Breeding Ansorgii Bichirs in captivity is extremely rare. They require very large tanks and specialized conditions, and most individuals in the hobby are wild-caught or farm-raised.

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Why Choose the Ansorgii Bichir?

• Impressive size and prehistoric appearance

• Rare and highly sought-after species

• Hardy and long-lived (15+ years)

• Perfect for monster fish aquariums

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The Ansorgii Bichir is a fascinating, ancient predator that can transform a large aquarium into a living slice of history. For experienced aquarists, it is one of the most rewarding and captivating species to keep.

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