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Acanthicus hystrix L-155, also called the Black Adonis Pleco, is a large South American loricariid valued for its striking body shape and armor of bony plates. Native to Brazil, particularly the Rio Tocantins basin, it inhabits rocky, well-oxygenated sections of major rivers. Its dark body, large fins, and developed odontodes give it a prehistoric appearance. This species is generally offered as a wild-collected fish and is best suited to experienced aquarists with a very large aquarium. It remains relatively accessible through specialty trade, with a rarity rating of 1 out of 3.

General species description

Acanthicus hystrix L-155 is a large, robust, heavily armored loricariid. It belongs to the genus Acanthicus, which includes plecos known for their spiny appearance and substantial adult size. It is mainly crepuscular and nocturnal; during the day, it often remains beneath roots, inside a cavity, or against a stone. Despite its imposing appearance, it is not an active predator: it mainly grazes surfaces and searches the bottom for food. A very spacious aquarium is essential because adults become bulky and produce a significant biological load. Strong shelters, efficient circulation, and well-oxygenated water support successful adaptation. The layout should also be stable, since this fish may move decorations while investigating the substrate. Its temperament is usually calm, although it may defend a preferred shelter from other large loricariids.

Geographic origin and biotope

The species is associated with Brazil and the Rio Tocantins basin, a large river network in eastern Amazonia. It inhabits broad freshwater environments where the current can be strong, especially around boulders, banks, and submerged structures. The biotope generally has clear to slightly stained water, good oxygen availability, and a bottom made of rocks, gravel, and coarse sand. Roots and submerged trunks provide important cover. Aquatic vegetation is usually not dense in fast-flowing areas; plants are more concentrated in sheltered sections, while riverside vegetation provides shade and organic debris. In an aquarium, the priority should therefore be clean, well-filtered water with strong circulation and no waste accumulation around resting areas.

Precise locality and local name

The reference locality supplied for Acanthicus hystrix L-155 is the Rio Tocantins in Brazil. Within this type of large basin, the fish is generally associated with rocky areas, hollow banks, and submerged obstacles where it can cling or hide. The aquarium trade name Black Adonis Pleco is widely used internationally. The word “acari” is also used in Brazil for several armored catfish, but commercial names may vary between suppliers. The code L-155 belongs to the provisional designation system used in the aquarium trade for loricariids whose commercial or taxonomic identification was not yet standardized. To reduce confusion, it is best to retain the scientific name, L-number, and stated origin together, especially for large Acanthicus with similar coloration.

Appearance and physical characteristics

The body of Acanthicus hystrix L-155 is elongated, sturdy, and covered with bony plates. Its coloration ranges from very dark brown to black, explaining the common name Black Adonis Pleco. The ventral, sucker-shaped mouth allows it to anchor itself to rocks and wood while rasping surfaces. The dorsal and caudal fins are well developed, producing a particularly impressive outline when fully extended. Odontodes, or small tooth-like structures, develop along the sides of the body and fins, especially in adult males. Young fish may show more contrasting markings that often become more uniform as they grow. Adult size requires serious planning: an ordinary display aquarium is suitable only for juveniles. Provide substantial bottom space, shelters appropriate for the fish’s size, and a secure cover, since large loricariids can move suddenly.

General diet

Acanthicus hystrix L-155 is mainly omnivorous with detritivorous and grazing tendencies. Its diet should be based on quality sinking foods containing plant ingredients, supplemented with vegetables such as zucchini, cucumber, or blanched spinach. Natural wood is useful in the aquarium and may be grazed, although it does not replace a complete diet. Richer foods such as shrimp, mussel, or protein-based pellets can be offered in small amounts, particularly to growing fish. An exclusively vegetable diet is not necessarily appropriate for a large Acanthicus; a balance of fiber, plant matter, and protein is preferable. Feeding after the lights go out suits its nocturnal rhythm and reduces competition. Remove leftovers to protect water quality, especially in an aquarium where waste production is substantial.

Essential data

• Original river: Rio Tocantins
• Local name used: Acari-preto; Black Adonis Pleco in the aquarium trade
• Origin of the scientific name: Genus Acanthicus and specific epithet hystrix
• Full-name etymology: Acanthicus comes from the Greek akantha, meaning “thorn” or “spiny”; hystrix means “porcupine,” referring to the fish’s bristling appearance
• Common/vernacular names: Black Adonis Pleco, Black Adonis, acari-preto
• Family: Loricariidae
• Subfamily: Hypostominae
• Pronunciation: uh-KAN-thi-kus - HIS-triks
• Discovery: Louis Agassiz, 1829
• Maximum adult size: About 60 cm
• Water temperature and pH: 24 to 28 °C; pH 6.0 to 7.5
• Watercourse appearance and surrounding vegetation: Large freshwater river, often rocky and well oxygenated, with roots, submerged wood, and riverside vegetation providing shade
• Typical tankmates: Tocantinsia piresi, Panaque armbrusteri L-027c, Cichla piquiti
• Temperament and behavior: Generally peaceful, territorial around shelters, and mainly active at night
• Water depth: Shallow to intermediate bottom areas near rocks and submerged structures
• Sexual dimorphism: Adult males generally develop more pronounced odontodes and a more bristling appearance
• Bottom structure and flow: Rocks, coarse sand, gravel, and wood; moderate to strong current with highly oxygenated water

For greater success

Success with Acanthicus hystrix L-155 depends first on available space, filtration quality, and a stable layout. A very large aquarium, strong circulation, well-oxygenated water, and several sturdy shelters are essential. Offer a varied diet after the lights go out and monitor waste accumulation. Because the available specimens are wild-collected, gradual acclimation and close observation during the first weeks are especially important. Avoid aggressive fish and overly territorial bottom-dwelling competitors. With adequate space and rigorous maintenance, this large pleco can become a long-lasting centerpiece fish.