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Native to Colombia, Ancistrus triradiatus is a small loricariid valued for its sturdy shape, sucker mouth and role as a grazer in the aquarium. Associated with the Rio Choco, this bottom-dwelling fish inhabits well-oxygenated areas where current carries wood, stones and grazing surfaces. Its generally peaceful behavior suits community aquariums when it is provided with shelters and regular plant-based foods. This form is considered uncommon and is offered by Ton.Fish in Canada as wild-collected specimens.

General species description

Ancistrus triradiatus is a freshwater catfish from the family Loricariidae, subfamily Ancistrinae. It is a benthic fish that grips surfaces with its sucker mouth and mainly explores the décor, wood and stones. Its presence helps consume some biofilm and algae, but it does not replace aquarium maintenance. The species prefers clean, well-oxygenated water with moderate current. It is generally discreet during the day and becomes more active as the light fades. Its availability is intermediate: it is uncommon and offered less regularly than the most widespread captive-bred Ancistrus.

Geographic origin and biotope

This population is associated with Colombia, in the area of the Rio Choco. The related biotope consists of tropical streams with flowing sections, mineral substrates and submerged wood. Riparian vegetation shades the waterway and adds organic material to the habitat. In an aquarium, the functional features of this environment are the most important: continuous water movement, sturdy shelters and natural grazing surfaces. Stable water, low nitrogen waste and adequate circulation support long-term maintenance.

Precise location and local name

The commercial locality supplied for Ancistrus triradiatus is the Rio Choco in Colombia. A precise local name used by river communities is not retained here. In the aquarium trade, the fish is mainly identified by its scientific name and by broad names such as bristlenose pleco. Trade names may vary according to the collector, importer or geographic population, so the scientific reference should be kept when purchasing, maintaining or breeding the fish.

Appearance and physical characteristics

Ancistrus triradiatus has a ventrally flattened body, a broad head and a lower mouth adapted for grazing. Its coloration is generally grayish brown to dark brown, with paler markings that help it blend into wood and stones. The fins are suited to life on the bottom, while the head odontodes become especially visible in adult males. These skin structures are a distinctive feature of the group. Maximum adult size is about 12 cm. The sucker mouth, head odontodes and bottom-oriented posture are its most recognizable traits.

General diet

Its diet is based mainly on biofilm, algae and plant material found on submerged surfaces. In an aquarium, natural grazing should be supplemented with spirulina-based tablets, vegetable wafers and blanched vegetables such as zucchini. A piece of natural wood is useful both as a food surface and as décor. Small amounts of meaty foods may be offered occasionally, but they should not dominate the diet. Regular plant-based feeding helps maintain good body condition, especially in aquariums with little algae. Remove leftovers to protect water quality.

Essential data

• River of origin: Rio Choco
• Local name used: Ancistrus; bristlenose pleco in aquaria
• Origin of the scientific name: Ancistrus comes from Greek and refers to a hook; triradiatus comes from Latin and means three-rayed
• Etymology of the full name: Ancistrus refers to a hooked structure; triradiatus means three-rayed
• Common/vernacular names: Bristlenose pleco; bushynose Ancistrus
• Family: Loricariidae
• Subfamily: Ancistrinae
• Name pronunciation: an-SIS-trus try-ray-dee-AH-tus
• Discovery: Carl H. Eigenmann, 1918
• Maximum adult size: About 12 cm
• Water temperature and pH: 24 to 28 °C; pH 6.5 to 7.5
• Stream appearance and surrounding vegetation: Shaded tropical stream, moderate current, wood and stones; abundant riparian vegetation
• Typical tankmates: Hyphessobrycon columbianus, Hoplisoma metae, Geophagus pellegrini
• Temperament and behavior: Peaceful and discreet, mainly active at dusk and at night; males may show territorial behavior
• Water depth: Shallow to intermediate sections
• Sexual dimorphism: Adult males are generally more slender, with more developed odontodes on the head and body margins
• Bottom structure and flow: Bottom of stones, wood and organic debris; moderate to strong flow with well-oxygenated water

In your aquarium

Success depends on stable water, efficient filtration and décor that provides several refuges. Include natural wood, caves and grazing surfaces, then feed after lights-out if tankmates are highly competitive. Avoid overcrowding and waste accumulation on the bottom. Because this is a wild-collected species, acclimation should be gradual and observation should be close during the first weeks. Its exclusive availability from Ton.Fish in Canada gives aquarists access to an uncommon form while allowing conditions close to its natural environment.