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Bunocephalus coracoideus, also called Banjo Catfish, is a small South American catfish recognized for its flattened body and remarkable camouflage. Its mottled brown coloration resembles a dead leaf or a piece of bark, an adaptation useful in quiet waters filled with plant debris. It belongs to the family Aspredinidae and spends most of its time close to the substrate. This peaceful species suits a well-structured aquarium with a soft bottom, hiding places, and food offered after the lights go out. Specimens available to aquarists are often **wild-collected**, and availability remains moderate rather than constant.

General species description

Bunocephalus coracoideus is a small benthic catfish adapted to life along the bottoms of South American waterways. Its unusual, almost triangular outline when viewed from above, together with its ability to remain motionless among fallen leaves, explains the common name Banjo Catfish. It belongs to the family Aspredinidae, a group of catfish strongly adapted to soft substrates. Activity usually increases at dusk and during the night, when it searches the bottom for food. Its temperament is **peaceful**, but it does best in a quiet environment without excessive feeding competition. Availability in the trade is **moderate**; offered fish are frequently wild-collected, making gradual acclimation and close observation especially important after transport.

Geographic origin and habitat

In Colombia, Bunocephalus coracoideus is associated with the **Amazon Basin**, particularly forested tributaries with slow or moderately flowing water. Its South American range also includes areas connected to major Amazonian and Orinoco drainage systems. Typical habitat includes water often stained by organic matter, subdued light, and a bottom covered with leaves, branches, mud, or fine sand. Dense streamside vegetation limits direct sunlight and regularly adds plant debris to the water. In an aquarium, these conditions translate into **dim lighting**, abundant shelter, and stable water that is soft to moderately mineralized. Wild specimens benefit from slow acclimation, especially after shipping, and should not be exposed to abrupt changes in chemistry or temperature.

Precise locality and local name

In Colombia, Bunocephalus coracoideus is generally associated with **forested Amazonian tributaries** rather than the exposed sections of large rivers. In the trade and among Spanish-speaking aquarists, it may be called **pez banjo**, a direct translation of Banjo Catfish. Local terminology can vary by region and is not always standardized. In the field, it is favored by quiet areas where leaves and small branches accumulate. Its coloration makes it difficult to see, especially when it remains still on a dark substrate. This camouflage explains why wild-collected fish may initially appear very secretive. A gradual transition to aquarium foods usually helps them settle and feed more reliably.

Appearance and physical characteristics

The body of Bunocephalus coracoideus is short, flattened, and highly camouflaged. Its coloration ranges from light brown to dark brown, with irregular markings that resemble a dead leaf. The head is broad and flattened, while the caudal peduncle narrows clearly toward the rear. The pectoral fins have **spiny rays**, an important feature to consider during handling and packing. Barbels around the mouth help it detect food on the substrate. The eyes are relatively small, consistent with its mainly nocturnal lifestyle. Adult length can reach about **15 cm**, although aquarium specimens may remain smaller depending on feeding and general conditions. Its appearance allows it to blend effectively with leaves, sand, and submerged wood.

General feeding

Bunocephalus coracoideus is an opportunistic bottom feeder that searches for small prey and organic material. In nature, its diet may include insect larvae, small invertebrates, and animal debris. In aquariums, it accepts **sinking wafers** for catfish, suitable pellets, and frozen foods such as bloodworms or brine shrimp. Food should reach the bottom, preferably after the lights go out, since activity is mainly crepuscular and nocturnal. It should not be expected to consume aquarium waste or act as a cleaner fish. A varied diet offered in small portions helps maintain condition without overloading the substrate. Wild specimens may need several days to adjust before accepting prepared foods consistently.

Essential data

• Native river: Amazon River and associated tributaries
• Local name used: Pez banjo
• Origin of the scientific name: Bunocephalus refers to the species’ knobby head shape; coracoideus suggests a resemblance to the coracoid bone
• Full-name etymology: Bunocephalus means approximately knobby-headed; coracoideus means coracoid-like
• Common/vernacular names: Banjo Catfish, banjo catfish, pez banjo
• Family: Aspredinidae
• Subfamily: Aspredininae
• Name pronunciation: boo-no-sef-ah-lus cor-ah-koy-dee-us
• Discovery: Edward Drinker Cope, 1874
• Maximum adult size: About 15 cm
• Water temperature and pH: 23 to 28 °C; pH 5.5 to 7.5
• Watercourse appearance and surrounding vegetation: Slow to moderately flowing, often shaded water with leaf litter, branches, and forest vegetation along the banks
• Typical tankmates: Hyphessobrycon columbianus, Hoplisoma metae, Geophagus steindachneri, Otocinclus vestitus
• Temperament and behavior: Peaceful, secretive, mainly nocturnal, and benthic
• Water depth: Shallow to moderately deep bottom zones
• Sexual dimorphism: Mature females are generally heavier-bodied; sexing can be difficult
• Bottom structure and flow: Fine sand, mud, leaves, and submerged wood; slow to moderate current
• Collection status: Frequently offered as wild-collected specimens

In your aquarium

To succeed with Bunocephalus coracoideus, provide a mature aquarium with a **smooth substrate**, roots, and several hiding places. Gentle filtration, stable water, and sinking food offered in the evening suit its natural behavior better than intense lighting and a bare layout. Handle it carefully because of its sharp pectoral rays. Since specimens are often wild-collected, acclimation should be patient and their condition should be watched closely during the first weeks. Peaceful tankmates and limited bottom-feeding competition will support its long-term well-being.