Xyliphius melanopterus

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Xyliphius melanopterus is a small South American catfish from the family Aspredinidae, commonly known as a banjo catfish. Its flattened body and discreet appearance reflect an adaptation to life close to the substrate. Described from the western Amazon basin, it remains rare in the aquarium trade and is mainly offered as a wild-collected fish. Its nocturnal habits, subdued coloration, and unusual body shape make it a species for aquarists who appreciate specialized bottom-dwellers rather than highly active or brightly colored fish.

General description

Xyliphius melanopterus is a banjo catfish belonging to Aspredinidae, a group of small South American catfish recognized by their flattened shape and skin plates. It lives close to the substrate and spends much of the day hidden among the décor. Activity increases at dusk and during the night, when it searches the bottom for food. Its appeal in aquaria comes from its unusual morphology and secretive behavior rather than constant midwater swimming. Because it is uncommon in the aquarium hobby, newly imported specimens should be acclimated carefully and encouraged to feed soon after arrival.

Geographic origin and biotope

Country of reference: Peru. The species is associated with the western Amazon basin, particularly the Ucayali drainage. It inhabits areas with soft substrate or accumulated debris, where its flattened body allows it to remain close to the bottom. The natural habitat consists of warm, soft tropical water, often influenced by organic matter and reduced light beneath forest cover. In the aquarium, this setting can be approximated with shaded areas, roots, and fine substrate, while maintaining clean, well-oxygenated water.

Precise location and local name

Xyliphius melanopterus is associated with the Río Ucayali basin in Peru. A precise local name used by riverside communities is not commonly reported in aquarium references. In the trade, it is generally identified by its scientific name or by descriptive English names such as banjo catfish. The lack of a consistently used vernacular name makes the complete scientific name especially useful for avoiding confusion with other similarly shaped aspredinid catfish.

Appearance and physical characteristics

The body of Xyliphius melanopterus is elongated, strongly flattened toward the front, and tapered toward the tail. The head is broad and low, with an inferior mouth and barbels suited to locating food on the substrate. Its skin and body plates create the rough texture characteristic of Aspredinidae. The coloration is generally brown to grayish, sometimes mottled, with fins that may appear darker, explaining the specific name melanopterus. This banjo catfish body shape provides effective camouflage among sand, leaves, and submerged wood.

General diet

In nature, Xyliphius melanopterus searches the substrate for small organisms, including insect larvae, small crustaceans, and other bottom-dwelling prey. In aquaria, offer food after the lights have been partly dimmed: sinking carnivorous tablets, bloodworms, tubifex from a reliable source, and small frozen foods. Pellets should reach the bottom so the fish can find them without excessive competition. A varied diet offered in small portions supports acclimation in this nocturnal species and reduces the risk of it being outcompeted by faster tankmates.

Essential data

• River of origin: Río Ucayali
• Local name used: Banjo catfish; scientific name commonly used
• Origin of the scientific name: Genus name Xyliphius and specific epithet melanopterus
• Full-name etymology: Xyliphius is a Latinized Greek name; melanopterus comes from the Greek melas, black, and pteron, wing or fin, referring to dark fins
• Common/vernacular names: Banjo catfish; black-fin banjo catfish
• Family: Aspredinidae
• Subfamily: Aspredininae
• Name pronunciation: zil-if-ee-us - mel-an-op-ter-us
• Discovery: Gustavo Orcés Villagómez, 1962
• Maximum adult size: About 8 cm
• Water temperature and pH: 24 to 28 °C; pH 5.5 to 7.0
• Watercourse appearance and surrounding vegetation: Shaded Amazonian watercourse, soft bottom, plant debris, and dense riverside vegetation
• Typical tankmates: Small, peaceful Amazonian midwater fish and other calm bottom-dwellers
• Temperament and behavior: Peaceful, secretive, mainly nocturnal, and closely associated with the bottom
• Water depth: Bottom-oriented areas; depth varies
• Sexual dimorphism: Not obvious in routine observation
• Bottom structure and flow: Fine substrate, leaves, and submerged wood; low to moderate flow

In your aquarium

Success with Xyliphius melanopterus depends on a mature aquarium, non-abrasive substrate, and several shelters directly above the bottom. Keep the water stable, soft to slightly acidic, and efficiently filtered without excessive current. Because this is a wild-collected species and very rare in the aquarium hobby, acclimation should be gradual and feeding should be checked each evening. Calm tankmates that do not monopolize sinking foods will greatly improve its chances of settling in successfully.