Senegal Bichir Care Guide: Polypterus Senegalus Ancient Predator
Watching a Senegal bichir glide along the bottom of your tank is like observing a living fossil. Polypterus senegalus belongs to a lineage stretching back over 60 million years, and its primitive lungs, ganoid scales and snake-like movement set it apart from anything else in the freshwater hobby. This polypterus senegalus bichir care guide from Gensou Aquascaping at 5 Everton Park, Singapore, covers everything you need to keep this remarkable predator healthy and thriving in a home aquarium. Despite their prehistoric appearance, Senegal bichirs are surprisingly hardy and adaptable.
Natural History and Anatomy
Polypterus senegalus is native to shallow, slow-moving waters across West and Central Africa, including floodplains, swamps and lake margins. Its most remarkable feature is paired lungs that supplement gill respiration, allowing it to survive in oxygen-poor water and even breathe atmospheric air at the surface. The dorsal fin consists of a series of finlets rather than a single continuous fin, giving the genus its name (poly = many, pteros = fin). Thick ganoid scales provide armour-like protection. This anatomy makes the Senegal bichir exceptionally robust in captivity.
Tank Size and Setup
Senegal bichirs grow to 25-30 cm in aquariums, making them the smallest and most manageable Polypterus species. A minimum tank size of 200 litres is appropriate for a single specimen, with 300 litres or more preferred for pairs or community setups. Use sand substrate, as bichirs spend significant time resting on the bottom and rough gravel can abrade their undersides. Provide PVC pipes, driftwood caves and dense plant clusters as hiding spots. Dim lighting suits their crepuscular nature. A secure lid with no gaps is critical because bichirs can and do escape through surprisingly small openings, using their pectoral fins to climb.
Water Parameters
Senegal bichirs are remarkably tolerant of varying water conditions, which contributes to their popularity among hobbyists. Temperature range is 24-28 degrees Celsius, well within Singapore’s ambient range. pH can span from 6.5 to 7.5, with GH of 5-20. PUB tap water works adequately with dechlorination, though adding a small amount of crushed coral raises hardness to a more comfortable mid-range. Maintain ammonia and nitrite at zero and nitrate below 30 ppm through weekly 25-30% water changes. Their tolerance should not invite neglect; consistent parameters produce healthier, longer-lived specimens that can reach 15-20 years.
Feeding a Predator
Bichirs are carnivorous ambush predators with poor eyesight but an excellent sense of smell. Feed sinking pellets formulated for predatory fish as a convenient staple. Supplement with frozen bloodworms, prawns, mussel and white fish strips. Live earthworms are relished and provide excellent nutrition. Feed three to four times per week for adults; juveniles benefit from daily feeding. Overfeeding leads to obesity, a common problem in captive bichirs whose owners enjoy watching them hunt. A slightly concave belly profile between feeds is normal and healthy.
Tank Mates
Any fish small enough to fit in a bichir’s mouth will eventually become a meal, so choose tank mates accordingly. Suitable companions include medium to large cichlids, larger synodontis catfish, larger characins and other Polypterus species. Severums, geophagus cichlids and larger gouramis coexist well. Avoid small tetras, guppies, dwarf shrimp and any species under 6-7 cm. Similarly, do not house bichirs with aggressive cichlids that might damage their eyes, as bichirs rely heavily on smell rather than sight and are at a disadvantage in visual confrontations. Multiple bichirs can be kept together in sufficiently large tanks with minimal aggression.
Breeding Senegal Bichirs
Breeding occurs occasionally in home aquariums but requires specific triggers. A simulated dry season with reduced water changes and slightly lower water levels for four to six weeks, followed by a large cool water change mimicking the onset of rains, can trigger spawning. Males develop a thickened, enlarged anal fin used to cup and fertilise eggs from the female. Eggs are scattered among fine-leaved plants. Remove adults after spawning. Fry are tiny and possess external gills resembling those of amphibian larvae, a remarkable evolutionary feature. Feed infusoria and baby brine shrimp. Growth is slow in the first few months.
Health and Common Issues
Senegal bichirs are among the hardiest freshwater species in the hobby. Skin infections from rough substrate or physical injury are the most common problem. Treat with aquarium salt at 2-3 g per litre and clean water. Internal parasites can affect wild-caught specimens; treat with praziquantel during quarantine. Eye cloudiness sometimes occurs in tanks with high nitrate or poor maintenance. Because bichirs surface to gulp air, ensure there is always a gap between the water surface and the lid. A polypterus senegalus bichir care routine built on regular maintenance and appropriate feeding keeps most health issues at bay.
The Appeal of Ancient Fish
In a hobby dominated by colourful schooling fish and manicured aquascapes, bichirs offer something fundamentally different: a connection to deep evolutionary time. Their quiet intelligence, unhurried movement and prehistoric anatomy fascinate keepers who value character over flash. Senegal bichirs are available at most established aquarium shops in Singapore for $15-$30 SGD, making them an accessible entry point into the world of primitive fish. A well-maintained bichir tank becomes a conversation piece that transcends typical fishkeeping aesthetics.
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