A fascinating 'living fossil' from the Congo River Basin, named after a mythological African dinosaur. While considered one of the smaller bichir species, it still reaches up to 36cm (14 inches). Like all bichirs, they possess a modified swim bladder acting as a lung, requiring access to atmospheric air. They are nocturnal ambush predators with heavily armored, eel-like bodies.
Mokele-mbembe Bichir At a Glance
Mokele-mbembe Bichir Tank Requirements
Will Mokele-mbembe Bichir fit in your tank?
Care guides tell you what Mokele-mbembe Bichir needs, the next question is whether your tank can safely provide it. Test Mokele-mbembe Bichir against your tank size, maintenance needs, and the fish you already keep before you buy.
Useful setup supplies
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Mokele-mbembe Bichir Water Parameters
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Mokele-mbembe Bichir Temperament & Compatibility
Mokele-mbembe Bichir Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Adult / Standard
Fully mature Mokele-mbembe Bichir. They are relatively peaceful towards tank mates that are too large to swallow, but will predate on smaller fish (like tetras or rasboras) at night. A tight-fitting lid is absolutely critical as they are notorious escape artists.
Same care requirements as the base species
Also known as: Adult, Breeder
Juvenile (Grow-out)
Juvenile specimens (typically sold around 7-10cm). Young bichirs often possess distinct feathery external gills that recede as they mature and their lung function takes over. They grow rapidly during their first year and require frequent meaty meals and pristine water quality.
Differs in 4 traits from base species
Also known as: Baby Bichir, Juvenile
Mokele-mbembe Bichir Care Guide Summary
The Mokele-mbembe Bichir, scientifically known as Polypterus mokelembembe, belongs to the Oddballs family group. Adults reach a maximum size of approximately 36 cm and have a eel body shape with a slow growth rate. Classified as semi-aggressive, this species primarily occupies the bottom zone of the aquarium and produces a high level of biological waste.
To thrive, the Mokele-mbembe Bichir requires a freshwater only aquarium with a minimum volume of 200 litres and a tank length of at least 120 cm. Water temperature should be maintained between 24°C and 28°C, with a pH range of 6.5–7.5 and a general hardness of 5–19 dGH. A low water flow is preferred.
Due to its specialist needs, the Mokele-mbembe Bichir is best suited for fishkeepers who can provide a carefully planned setup. This species is available in 2 varieties: Adult / Standard and Juvenile (Grow-out). Each may differ slightly in size, temperament, or care needs, so it is worth checking the specific requirements of the variety you plan to keep.
Mokele-mbembe Bichir Habitat Setup
When setting up an aquarium for the Mokele-mbembe Bichir, a low water flow best suits their natural preferences. Because this species occupies the bottom zone, the aquarium layout should prioritise sufficient floor space with hiding spots among rocks, wood, or dense planting. Useful additions include a sand substrate to accommodate their sifting behaviour, smooth gravel or rounded substrate to protect their sensitive barbels, driftwood, which can serve as both a hiding place and a dietary supplement, and dense planting to provide cover, break sightlines, and reduce stress. Keepers should note that a tight-fitting lid is essential, as this species is a known jumper.
Mokele-mbembe Bichir Compatibility Notes
Classified as semi-aggressive, the Mokele-mbembe Bichir is adaptable and can be kept singly or in a small group, offering flexibility when planning a community tank. When choosing tankmates, any fish small enough to fit in its mouth will likely be eaten and ornamental shrimp are not safe companions. Selecting tankmates that favour different water layers from the bottom zone can help reduce competition and territorial overlap.
Mokele-mbembe Bichir Recommended Tank Sizes
Standard aquarium sizes that meet the minimum volume and length requirements for Mokele-mbembe Bichir.
55 Gallon Standard
60 Gallon Breeder
75 Gallon Standard
90 Gallon Standard
125 Gallon Standard
150 Gallon High
Mokele-mbembe Bichir Feeding & Diet Considerations
The Mokele-mbembe Bichir is a predatory species that will readily consume small fish, so nano or bite-sized tankmates should be avoided, will hunt and eat ornamental shrimp, making it unsuitable for shrimp-focused setups, will eat fry, so breeding efforts in the same tank are unlikely to succeed, and is primarily active at dusk and dawn, so offering food shortly after lights-off ensures it receives adequate nutrition.
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Frequently Asked Questions About Mokele-mbembe Bichir
How big does Mokele-mbembe Bichir get?
Mokele-mbembe Bichir (Polypterus mokelembembe) typically reaches a maximum adult size of approximately 36 cm. They have a eel body shape and a slow growth rate.
What tank size does Mokele-mbembe Bichir need?
A minimum aquarium volume of 200 litres and a tank length of at least 120 cm are recommended for Mokele-mbembe Bichir. This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Mokele-mbembe Bichir need?
Mokele-mbembe Bichir thrives in freshwater only conditions with a temperature range of 24–28°C, a pH between 6.5 and 7.5, and a general hardness of 5–19 dGH. A low water flow is preferred.
Is Mokele-mbembe Bichir peaceful or aggressive?
Mokele-mbembe Bichir is classified as semi-aggressive with an aggression score of 6 out of 10. They can work in community setups but may clash with certain tankmates.
Can Mokele-mbembe Bichir live alone?
Yes, Mokele-mbembe Bichir can be kept singly or in a group. They are flexible and adapt well to both setups.
Is Mokele-mbembe Bichir safe with shrimp?
No. Mokele-mbembe Bichir is known to eat ornamental shrimp and is not recommended for shrimp tanks. Even larger shrimp species like Amano Shrimp may be at risk.
Does Mokele-mbembe Bichir have any special tank requirements?
Yes. Mokele-mbembe Bichir benefits from sand (sifters), smooth gravel (sensitive barbels), driftwood (digestion/hiding), and plants - densely covered in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Does Mokele-mbembe Bichir need a lid on the tank?
Yes. Mokele-mbembe Bichir is a known jumper, and a tight-fitting lid or cover is essential to prevent escape. Even a small gap can be enough for a determined fish to leap out.
Plants That Suit Mokele-mbembe Bichir
These plants pair well with Mokele-mbembe Bichir based on shared water preferences, layout fit, and how likely they are to hold up in the same aquarium.
Amazon Frogbit
Limnobium laevigatum
Asian Watergrass
Hygroryza aristata
Asian Watermoss
Salvinia cucullata
Beckett's Water Trumpet
Cryptocoryne beckettii
Broad-leaved Crypt
Cryptocoryne pontederiifolia
Carolina Fanwort
Cabomba caroliniana
Fish Similar to Mokele-mbembe Bichir
Congo Bichir
Polypterus endlicheri congicus
The Congo Bichir is a prehistoric-looking, bottom-dwelling monster fish and one of the largest species in the Polypteridae family. They are obligate air-breathers and ambush predators that will eagerly consume any tankmate small enough to fit in their surprisingly large mouths. Due to their massive adult size, they require extremely large custom aquariums, heavy filtration, and a tight-fitting lid to prevent escapes.
Guinean Bichir
Polypterus ansorgii
An exceptionally rare, large-growing 'lower jaw' bichir native to West Africa. Known for its prehistoric appearance and striking dark vertical blotches. While early scientific records logged their size much smaller, modern hobbyist and field consensus acknowledges they can reach nearly 3 feet (75-85cm) in length. They are ambush predators; while peaceful to large tankmates, they will consume any fish that fits in their surprisingly large mouths.
Senegal Bichir
Polypterus senegalus
A fascinating, prehistoric-looking predatory fish often called the 'Dinosaur Eel'. They possess a modified swim bladder acting as a lung and must have access to the surface to breathe. Though peaceful with large, deep-bodied tank mates, they are strictly carnivorous and will consume any fish or invertebrate that fits in their mouths. Excellent escape artists; a heavy, tight-fitting lid is mandatory.
Delhezi Bichir (Armored Bichir)
Polypterus delhezi
An ancient, air-breathing predatory fish from the Congo River basin. Known for its distinct black vertical bands and dinosaur-like dorsal finlets. They are bottom-dwelling ambush predators with poor eyesight but an excellent sense of smell. While generally peaceful with similarly sized or larger fish, they are opportunistic piscivores and will eat anything that fits into their surprisingly large mouths.
Palmas Bichir
Polypterus palmas palmas
An ancient, primitive bottom-dweller from West Africa known for its dinosaur-like appearance and ability to breathe atmospheric air using modified lungs. While it is one of the smaller 'upper jaw' Bichir species, it is a highly capable ambush predator. It is generally peaceful towards fish too large to swallow, but completely unsafe for small community fish. A tight-fitting lid is absolutely mandatory to prevent escaping.
Polypterus Bichir Lapradei
Polypterus bichir lapradei
The Lapradei Bichir is a massive, ancient, air-breathing predatory fish native to West Africa. Featuring distinct dorsal finlets and a heavily armored, snake-like body, it is a fascinating 'monster fish'. As nocturnal ambush predators, they will consume any tank mate that fits in their surprisingly large mouths. However, they are remarkably peaceful with robust companions that are too large to eat. A tight-fitting lid is absolutely mandatory as they are notorious escape artists.