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Introduction

Polypterus lapradei koliba is a West African bichir valued for its prehistoric appearance and elongated body. Its unusual form, combined with a series of dorsal finlets, gives it a distinctive presence in a large aquarium. The commercial form “Koliba” refers to its geographic origin in the Koliba River basin of Guinea. This is a predatory, nocturnal and bottom-dwelling fish that must be kept with tank mates large enough not to be viewed as prey. Specimens offered to aquarists are wild-collected fish and remain relatively uncommon in the hobby.

General species description

The genus Polypterus includes African fishes with several ancient anatomical traits, including functional lungs and the ability to breathe atmospheric air. Polypterus lapradei koliba spends most of its time near the bottom and uses its pectoral fins to move with an almost terrestrial-looking gait. It is most active at dusk and during the night. In an aquarium, it may remain hidden during part of the day before slowly exploring the layout in search of food. It requires a very large, tightly covered aquarium with an open bottom area. This form is less common in the trade than several other bichirs, which makes it appealing to specialized aquarists. Despite its robust appearance, it remains vulnerable to poor water quality and injuries caused by sharp décor.

Geographic origin and habitat

The Koliba form is associated with Guinea, West Africa, in the basin of the Koliba River. It occurs in quiet or moderately flowing areas, including margins, sections filled with branches and places where the bottom allows the fish to forage. The water is generally warm, soft to moderately mineralized, and may have variable visibility depending on season and sediment load. Natural surroundings can include wooded banks, accumulated leaves and emergent or riverside vegetation, while submerged plants may be irregularly distributed. Access to a humid atmosphere and the water surface is important for this fish, which periodically breathes air. In captivity, the main goal is to provide a calm, shaded environment with abundant shelter rather than strong current.

Precise location and local name

The name “Koliba” refers to the Koliba River in Guinea and is used to distinguish this provenance from other populations assigned to Polypterus lapradei. In the aquarium trade, it is mainly called Laprade’s bichir, African bichir or simply bichir. Regional vernacular names may differ, and several common names are applied to different polypterus species. To avoid confusion, the “Koliba” locality should be retained alongside the scientific name used by the supplier. This is especially useful for wild fish, whose appearance may vary with origin, age, nutritional condition and acclimation history.

Appearance and physical characteristics

Polypterus lapradei koliba has a cylindrical, elongated body covered with hard ganoid scales. Its coloration is usually grayish brown to olive, with irregular darker markings that help it blend into muddy or debris-filled bottoms. The dorsal fin is divided into several separate finlets, a characteristic feature of bichirs. The pectoral fins are broad and muscular, while the pelvic and anal fins are positioned toward the rear of the body. The head is flattened, with relatively small eyes and a wide mouth adapted for capturing prey. Young fish often have a slimmer shape and stronger contrast. A properly fitted cover is essential because this fish is an excellent escape artist and can breathe atmospheric air.

General diet

Polypterus lapradei koliba is an opportunistic carnivore that locates prey mainly through smell and movement in the water. Its diet should be based on quality meaty foods, including appropriately sized thawed fish, shrimp, mussels, clean earthworms and sinking carnivore foods. Predator pellets may be accepted after acclimation, but they should not be the only food offered. Feeding in the evening is preferable because activity increases at that time; uneaten food should be removed to protect water quality. Small live fish are not recommended as a regular food, particularly because of disease risks. Tank mates small enough to fit into its mouth will probably be eaten. A varied diet, moderate portions and occasional digestive breaks help reduce obesity and problems related to overfeeding.

Essential data

• Native river: Koliba River
• Local name used: Bichir; Laprade’s bichir
• Origin of the scientific name: Polypterus lapradei koliba is a provenance name used for the form associated with the Koliba River.
• Complete name etymology: Polypterus means “many fins”; lapradei honors Laprade; koliba refers to the Koliba River.
• Common/vernacular names: Laprade’s bichir, African bichir
• Family: Polypteridae
• Subfamily: Polypterinae
• Name pronunciation: pol-ip-TEER-us la-prad-EYE ko-LEE-ba
• Discovery: Franz Steindachner, 1869 for Polypterus lapradei
• Maximum adult size: About 74 cm
• Water temperature and pH: 24 to 28 °C; pH 6.5 to 7.5
• Watercourse appearance and surrounding vegetation: Quiet to moderately flowing areas, wooded banks, branches, leaf litter and riverside vegetation.
• Typical tank mates: Polypterus bichir bichir, Polypterus delhezi, Polypterus endlicheri, Polypterus ornatipinnis, Erpetoichthys calabaricus
• Temperament and behavior: Generally calm, nocturnal predator, usually limited territoriality, but capable of swallowing small fish.
• Water depth: Shallow to moderately deep areas, close to the bottom and margins.
• Sexual dimorphism: The male’s anal fin is generally broader and thicker; juveniles can be difficult to sex.
• Bottom structure and flow: Muddy, sandy or plant-debris bottoms; low to moderate flow.

For aquarium success

Success depends on a long, very spacious aquarium, efficient filtration, stable hiding places and an absolutely secure cover. Keep the water warm, clean and well oxygenated without creating excessive current. Avoid sharp edges in the décor and leave open floor space. Choose only sturdy tank mates large enough to be safe. Because these are wild-collected specimens, gradual acclimation and close observation during the first weeks are especially important.