Polypterus endlicheri

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Introduction

Polypterus endlicheri, also called Saddle Bichir, is an ancient-looking African fish with an elongated, heavily scaled body. Its separated dorsal finlets, sturdy snout, and ability to breathe atmospheric air at the surface give it a unique presence in the aquarium. This mainly nocturnal predator spends much of its time near the bottom, slowly exploring its surroundings. It nevertheless requires a spacious, tightly covered aquarium with sturdy hiding places. Its rarity is rated Very common in the supplied scale, but its adult size makes it suitable only for aquarists prepared to provide a long-term setup.

General species description

Polypterus endlicheri belongs to the bichirs, a group of African fishes regarded as very old in evolutionary terms. It has a cylindrical body, thick scales, and a series of separate dorsal finlets. This structure helps it move close to the bottom, slip between obstacles, and cope with water that may contain little oxygen. Its temperament is generally calm, but it remains an opportunistic predator that will swallow prey small enough to fit in its mouth. It is most active at dusk and during the night. In an aquarium, it regularly uses its pectoral fins and muscular body to inspect the décor. It should be kept with fish of comparable size because small tank mates may be eaten. A tightly fitted lid is essential: Polypterus endlicheri is an excellent escape artist and can survive for some time out of water because of its accessory air-breathing ability.

Geographic origin and biotope

Polypterus endlicheri is native to several freshwater basins in tropical Africa, including the Nile, Niger, Volta, Lake Chad, and Congo systems. Reference countries: Egypt, Sudan, South Sudan, Chad, Nigeria, Niger, Ghana, Benin, Burkina Faso, the Democratic Republic of the Congo, and neighboring countries depending on the basin. It inhabits calm or slow-flowing areas such as floodplains, side channels, marshes, river lagoons, and vegetated margins. The bottom is often made of mud, sand, or fine gravel, with roots, branches, and debris providing shelter. Vegetation may be dense in shallow areas, especially during flood periods. These habitats can have changing conditions, but the species benefits from its ability to breathe air when there is limited dissolved oxygen. In an aquarium, however, this adaptation does not replace effective filtration and good water quality.

Precise location and local name

The range of Polypterus endlicheri covers a broad part of tropical Africa rather than a single watercourse. It occurs in the basins of the Nile, Niger, Volta, Lake Chad, and Congo, with populations associated with floodplains and slow-moving waters. The English common name Saddle Bichir refers to the dark saddle-shaped markings visible on the back and flanks of many individuals. The descriptive name “saddle bichir” is used more consistently in the aquarium trade than specific local names, which vary between regions and languages. For that reason, the scientific name remains the most precise designation in aquarium discussions. In stores, the species may also be grouped with other bichirs under the general name “bichir,” even though its heavy build and dorsal markings often help with identification. It is best to confirm the identification before purchase, especially because young fish may show less contrasting patterns.

Appearance and physical characteristics

Polypterus endlicheri has an elongated, robust body that is slightly flattened on top. Its background color ranges from gray-brown to olive brown, with darker markings forming irregular bands or saddle-like patches across the back. Thick ganoid scales give the skin a rigid, protective texture. The dorsal fin is divided into several small units with spines, a feature that is immediately recognizable in bichirs. The pectoral fins are well developed and are used for propulsion as well as slow movements over the substrate. Its mouth is wide and adapted for capturing fish, crustaceans, and other animal prey. Like other members of its group, it has primitive lungs or accessory respiratory structures that allow it to take air at the surface. Adult specimens can exceed 60 cm and reach about 75 cm under favorable conditions. Its bulky body therefore requires a long aquarium with open floor space and no sharp décor.

General diet

Polypterus endlicheri is a carnivore that feeds mostly when light levels decrease. In nature, its diet includes small fish, aquatic larvae, crustaceans, insects, and other bottom-dwelling animals. Its sense of smell and sensory barbels help it locate prey in turbid water or at night. In the aquarium, suitable foods include pieces of fish or shrimp, clean earthworms, mussels, and quality frozen or sinking foods. Meaty pellets may be accepted after acclimation, but they should not be the only food source. Prey should be sized according to the width of its mouth to prevent choking and overfeeding. It is preferable to feed adults small portions several times per week while monitoring body condition. A varied, protein-rich diet supports steady growth, whereas live feeder fish may introduce parasites or provide unbalanced nutrition.

Essential data

• Native river name: Nile, Niger, Volta, Lake Chad, and Congo basins
• Local name used: Saddle Bichir
• Origin of the scientific name: Polypterus endlicheri
• Full-name etymology: Polypterus means “many fins”; endlicheri honors the botanist and naturalist Stephan Ladislaus Endlicher
• Common/vernacular names: Saddle Bichir
• Family: Polypteridae
• Subfamily: No commonly recognized subfamily
• Name pronunciation: pol-ip-TER-us - end-LIK-er-ee
• Discovery: Johann Jakob Heckel, 1847
• Maximum adult size: About 75 cm
• Water temperature and pH: 24 to 28 °C; pH 6.0 to 8.0
• Watercourse appearance and surrounding vegetation: Calm to slow waters, often turbid, with mudflats, roots, branches, aquatic plants, and flooded margins
• Typical tank mates: Ctenopoma acutirostre, Synodontis schoutedeni, Polypterus bichir bichir, Polypterus delhezi, Polypterus lapradei koliba
• Temperament and behavior: Generally calm, nocturnal, bottom-dwelling, and predatory; may swallow sufficiently small fish
• Water depth: Margins, floodplains, and shallow to moderately deep areas
• Sexual dimorphism: Males generally have a broader, thicker anal fin; juveniles can be difficult to sex
• Bottom structure and flow: Mud, sand, or fine gravel; slow to moderate flow, with shelter from roots and branches

For greater success

Success with Polypterus endlicheri begins with a very spacious aquarium, especially in length and bottom area. Provide soft substrate, stable hiding places, and filtration capable of handling a high organic load. Always leave a humid air space beneath the lid and block every opening: escapes are common with this species. Keep the water stable, avoid tiny tank mates, and offer a varied meaty diet in the evening. With these precautions, this imposing fish can become a long-lived and fascinating aquarium resident. Its growth and adult size must be planned before purchase, since a temporary aquarium is not suitable for an adult.