Description
Polypterus delhezi, commonly referred to as the Barred Bichir or Armoured Bichir, is a captivating freshwater fish native to the Congo River Basin. Recognised for its bold vertical striping and prehistoric appearance, this species belongs to a lineage of primitive ray-finned fishes with lungs adapted for atmospheric breathing. Barred Bichirs are bottom-dwelling predators that exhibit nocturnal behaviour and require spacious, secure tanks with subdued lighting and appropriate tank mates.
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Features of a Polypterus delhezi
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Reaches up to 35–45 cm in length in captivity
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Elongated body with distinctive dark vertical bands on a grey-green or olive base
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Thick ganoid scales, dorsal finlets, and large pectoral fins give a prehistoric look
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Solitary and semi-aggressive; territorial with other Bichirs or similarly shaped fish
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Capable of air-breathing, allowing survival in low-oxygen environments
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Lifespan can exceed 15 years with proper care
The Best Aquarium Size for Polypterus delhezi
A minimum of 300 litres is recommended for a single adult Polypterus delhezi. Their size, activity level, and need for stable water conditions make large aquariums essential. A tight-fitting, escape-proof lid is non-negotiable, as this species is a known jumper.
Suitable aquariums to consider include:
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Tank Mate Compatibility for Polypterus delhezi
Diet for Polypterus delhezi
Polypterus delhezi is a strict carnivore. Offer a varied diet of sinking carnivore pellets, frozen foods such as shrimp, mussels, and bloodworms, as well as occasional live foods like earthworms or feeder shrimp. Avoid small tank mates that may be mistaken for food. Feeding is best done during dusk or nighttime when they are most active.
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Aquarium Setup Polypterus delhezi
Aquarium Filtration
Use a powerful canister or sump system with moderate flow. Although hardy, the species produces significant waste, so strong biological and mechanical filtration is crucial.
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Aquarium Plants
Live plants are optional and often ignored. If used, opt for hardy, anchored species like Anubias or floating plants. Ensure plants are not obstructing swimming areas near the bottom.
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Aquarium Lighting
Low to moderate lighting is preferred. This species is crepuscular and becomes more active in subdued light conditions.
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Aquarium Heating
Maintain a stable temperature between 25–28 °C. Use a submersible heater rated for large volumes, and monitor regularly for fluctuations.
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Aquarium Substrate
Fine sand or smooth gravel is ideal to prevent injury to the Bichir's soft underside. Avoid rough or jagged substrates.
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Aquarium Decorations
Incorporate large caves, driftwood, and inert rocks to provide hiding spaces and territorial boundaries. Ensure decor is secure and cannot topple or trap the fish. Avoid sharp objects that could tear its sensitive skin.
