Senegal Bichir

Geographic Origin and Biotope: Widely distributed through slow rivers, floodplains, marshes, and muddy backwaters across West and Central Africa, including the Senegal, Nile, Gambia, and Niger systems. It is adapted to warm, oxygen-poor shallows where surfacing for air is part of normal life.

Taxonomy and Morphology: A member of the ancient Polypteridae. Adults usually reach about 25-30 cm, with an elongated armored body, ganoid scales, separate dorsal finlets, fleshy pectoral fins, and a modified swim bladder used like a primitive lung.

Social Behavior: Generally one of the more active and approachable bichirs. It spends much of its time exploring the bottom by smell and touch, and may rest with other bichirs if space and hiding places are abundant. It is not aggressive in the cichlid sense, but it is a nocturnal predator that will eat any fish small enough to fit in its mouth.

Coloration and Sexual Dimorphism: Wild-type fish are plain grey, olive, or brown with a pale underside; albino forms are common in the trade. Mature males develop a broader, thicker anal fin, while females remain fuller-bodied with a narrower anal fin.

Tank Setup: Use a long aquarium, ideally 120 cm or more, with a tight, weighted lid and a clear air gap above the water. Fine sand is strongly preferred because bichirs lunge and nose through the substrate while feeding. Provide large caves, driftwood, shaded areas, and calm zones.

Feeding: Carnivorous. Offer sinking predator pellets, earthworms, thawed shrimp, mussel, krill, and pieces of lean fish. Avoid feeder fish and mammal or bird meat, which raise disease and nutrition risks.

Water Quality: Keep warm, stable water around 24-28°C with pH roughly 6.5-7.8. It is hardy, but heavy protein feeding means strong filtration and regular water changes are still essential.

Compatibility: Best with robust, peaceful fish that are too large to swallow. Avoid tiny tetras, small catfish, shrimp, and fin-nipping tankmates. Do not house with plecos or other suction-feeding fish that may rasp the bichir skin at night.

Reproduction: Rare in aquariums but possible in mature, spacious systems with dense spawning mops or plants. Eggs are scattered and adults should be removed if breeding is attempted.

Risks: Escapes through tiny lid gaps, drowning if denied access to atmospheric air, intestinal injury from coarse gravel, and starvation or competition if fast tankmates take all food before it reaches the bottom.