Polypterus endlicheri (Endlicher's Bichir)

Overview

Endlicher's Bichir (Polypterus endlicheri) is a magnificent ancient fish that captivates aquarists with its dinosaur-like appearance. As a basal ray-finned fish, it possesses a modified swim bladder that acts like a lung, allowing it to breathe atmospheric air. While frequently sold at smaller juvenile sizes like 4cm, they grow rapidly into impressive, large predators that demand respect and proper planning from their keepers.

Distribution and Habitat

Native to the continent of Africa, this species is widely distributed across the Nile, Niger, Volta, and Chad river basins. They primarily inhabit muddy, heavily vegetated margins of rivers, shallow swamps, and floodplains. These murky, slow-moving waters provide excellent cover for these ambush predators.

Description of Endlicher's Bichir

Body shape:

They possess an elongated, cylindrical body that is somewhat flattened ventrally. This robust, torpedo-like build is perfectly adapted for a life spent navigating the bottom of riverbeds and swamps.

Color:

The base coloration ranges from a sandy tan to a yellowish-brown. Their most distinguishing feature is a series of prominent, irregular dark brown or black vertical bands (often referred to as "saddles") running along their back and sides.

Barbels:

They possess distinct, tube-like nasal extensions (nares) protruding from their snout. These are highly sensitive and are used to hunt prey by scent in murky waters.

Snout:

Endlicher's Bichir belongs to the "lower-jaw" group of bichirs. Their snout features a prominent lower jaw that noticeably extends past the upper jaw, giving them a distinct underbite.

Eyes:

Their eyes are relatively small. Because they originate from turbid environments, they have poor eyesight and rely almost entirely on their excellent sense of smell to navigate and locate food.

Fins:

The dorsal fin is separated into a series of 11 to 15 distinct, sail-like finlets equipped with sharp spines. Their pectoral fins are muscular and lobe-like, functioning almost like legs to help them "walk" along the substrate.

The Tail:

The caudal (tail) fin is rounded, spade-like, and merges seamlessly with the posterior dorsal finlets, providing sudden bursts of speed for ambushing prey.

Temper

They are considered semi-aggressive. While they are generally peaceful and indifferent towards fish that are too large to be swallowed, they are highly predatory. Any tankmate small enough to fit into their surprisingly cavernous mouths will eventually be eaten.

Sociality

Endlicher's Bichirs can be kept solitarily or in a community of similarly sized, robust species (such as large characins, other bichirs, or large, mild-mannered cichlids). They are not usually aggressive toward their own kind or other bichir species, provided there is ample floor space and hiding spots for everyone.

Activity

Nocturnal by nature, they are most active during the evening and night. However, once settled into a home aquarium, they will often adapt to daytime feeding schedules and become more active and visible during daylight hours.

Keeping and Caring for Endlicher's Bichir

Tank size:

A massive aquarium is required for adult specimens. While a 4cm juvenile can be grown out in a smaller tank, adults require a minimum of 150 to 200 gallons. Floor space (footprint) is much more important than tank height; a footprint of at least 72x24 inches is highly recommended.

Water Parameters:

They are incredibly hardy and adaptable, but they still require clean water and stable conditions to thrive and reach their full potential.

Temperature

Keep the water warm, ideally between 24-28°C (75-82°F).

pH

They tolerate a wide range but prefer slightly acidic to neutral water, with a pH of 6.5 to 7.5.

Hardness

Water hardness should be kept moderate, ideally between 5-15 dGH.

Ammonia, Nitrite, Nitrate

Ammonia and Nitrite must always be at 0 ppm. Because they are large, messy eaters, strong filtration is required to keep Nitrates below 20 ppm through regular, large water changes.

Lighting

Dim or subdued lighting is preferred, mimicking the murky, shaded natural habitats they originate from. Floating plants can be used to diffuse bright aquarium lights.

Water flow

Moderate to low flow is ideal. They are not strong, continuous swimmers in fast currents and prefer calmer waters where they can rest on the bottom.

Decorations and Plants

A soft sand substrate is absolutely essential to prevent injury to their sensitive undersides and to avoid fatal impaction if they accidentally swallow substrate while feeding. Provide hiding spots using large, smooth driftwood and sturdy plants like Anubias or Java Fern. Most importantly, a tight-fitting, heavy lid is mandatory—they are notorious escape artists and will jump out of any gap.

Diet

Endlicher's Bichirs are strict carnivores. In the wild, they consume fish, amphibians, and aquatic invertebrates. In the aquarium, they should be offered a varied, meaty diet. Excellent options include earthworms, chopped tilapia fillets, raw prawns, mussels, and high-quality sinking carnivore pellets. Feeder fish are not recommended due to the risk of disease transmission.

Some Feeding Tips

If your bichir is shy or housed with fast-swimming tankmates, feed them at night or just after the aquarium lights go out. You can also use long feeding tongs to target-feed them directly, ensuring they get their fair share of food.

Breeding

Breeding Endlicher's Bichir in the home aquarium is extremely rare and difficult. In commercial aquaculture, breeding is often induced via hormone injections. They are egg-scatterers that lay slightly adhesive eggs in dense vegetation. The parents exhibit no parental care and will eat the eggs or fry if given the chance.

Conclusion

Endlicher's Bichir is a truly spectacular "monster fish" that brings a slice of prehistoric life directly into your home. While their massive adult size demands a significant commitment in terms of tank volume and heavy-duty filtration, their hardy nature, unique lung-breathing abilities, and fascinating dinosaur-like appearance make them an incredibly rewarding pet for the dedicated aquarist.