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Ancistrus dolichopterus L-183, also known as White Seam, is an Amazonian loricariid valued for its dark coloration edged by a clean white seam. The L-183 code identifies a commercial form associated with the Rio Negro basin, where the water is often soft, acidic and tannin-stained. This bottom-dwelling fish feeds mainly on biofilm, algae and plant matter, while also benefiting from natural wood to rasp. It is usually secretive during the day and becomes more active as the lighting fades. Its availability remains moderate, making it a sought-after fish among specialized aquarists.

General species description

Ancistrus dolichopterus L-183 is a small armoured catfish belonging to the family Loricariidae. Like other Ancistrus, it has a sucker-shaped mouth adapted for grazing surfaces and a body protected by bony plates. L-183 is especially appreciated for the contrast between its black or very dark brown body and the pale edges of its fins, particularly in young specimens. It mainly uses solid surfaces such as wood, rocks and aquarium glass. Its temperament is generally peaceful, although males may defend a cave from other males. Good oxygenation, stable water conditions and regular plant-based feeding are essential for long-term health.

Geographic origin and biotope

L-183 originates from the Rio Negro basin in Brazil, a river system known for tannin-rich blackwater. Its habitats include wooded margins, quiet areas and sections filled with submerged branches and leaf litter. Riparian vegetation often creates dense cover, limiting the light reaching the water. Current strength may range from gentle to moderate depending on the season and the location within the river system. In the aquarium, it is therefore useful to recreate a dim, structured environment rich in hiding places, with effective filtration but without an excessively forceful current.

Precise location and local name

The L-183 form is associated with the Rio Negro and flooded-forest habitats in Brazil. In its native region, loricariid catfish are commonly called cascudo, a Brazilian vernacular term applied to several armoured catfish rather than exclusively to this form. In the aquarium trade, the L-183 code remains the most practical way to distinguish this fish from other white-edged Ancistrus. The name White Seam directly refers to the white line outlining the fins, a visual feature that is especially noticeable in young fish and well-conditioned specimens.

Appearance and physical characteristics

The body of Ancistrus dolichopterus L-183 is stocky, ventrally flattened and usually black, charcoal grey or very dark brown. The fins have a pale edge forming a contrasting white seam, especially on the dorsal and caudal fins. Its lower sucker mouth allows it to attach to surfaces and rasp biofilm. At maturity, the male develops branched tentacles on the snout; these are absent or much less developed in females. The pectoral and dorsal fins are sturdy, while the bony plates protect the body. Adult size remains moderate, but a properly furnished aquarium is still needed to support healthy growth and natural behaviour.

General diet

Ancistrus dolichopterus L-183 is primarily herbivorous with a detritivorous tendency. Its diet should include vegetable-based tablets, spirulina wafers and blanched vegetables such as zucchini, cucumber or spinach. Natural wood is important because it provides a grazing surface and supports the typical feeding behaviour of Ancistrus. Frozen or protein-rich foods may be offered occasionally, but they should not form the foundation of the diet. Feed after the aquarium lights go out or at dusk to reduce competition. Uneaten food should be removed to maintain good water quality.

Essential data

• River of origin: Rio Negro
• Local name: Cascudo
• Origin of the scientific name: The name was assigned by Rudolf Kner in 1854.
• Etymology of the full name: Ancistrus comes from the Greek ankistron, meaning hook; dolichopterus comes from the Greek dolichos, long, and pteron, fin or wing, referring to elongated fins.
• Common/vernacular names: White Seam, L-183, White-edged Ancistrus, cascudo.
• Family: Loricariidae
• Subfamily: Hypostominae
• Name pronunciation: ang-SIS-trus dol-ih-KOP-ter-us
• Discovery: Rudolf Kner, 1854.
• Maximum adult size: Approximately 12 to 15 cm.
• Water temperature and pH: 26 to 30 °C; approximately pH 5.5 to 7.0.
• Appearance of the waterway and surrounding vegetation: Tannin-stained blackwater, wooded banks, flooded forest, submerged branches and leaves.
• Typical tankmates: Hemigrammus rhodostomus, Paracheirodon axelrodi, peaceful small characins, compatible dwarf cichlids and other non-aggressive midwater fish.
• Temperament and behaviour: Peaceful and secretive, mainly active at dusk and during the night; males become territorial around caves.
• Water depth: Mainly uses margins, submerged shelters and quiet sections.
• Sexual dimorphism: Adult males have well-developed snout tentacles; females have a smoother snout and are often broader-bodied.
• Bottom structure and flow: Sand, wood, leaves and plant debris; gentle to moderate flow depending on the habitat.

In your aquarium

To succeed with Ancistrus dolichopterus L-183, provide a mature aquarium with natural wood, caves and shaded areas. Clean, warm and well-oxygenated water is important, even when the biotope is acidic and tannin-stained. Offer varied plant-based foods every day and do not treat this fish as merely an algae eater. Keeping several males requires additional shelters to reduce territorial disputes. Since this form is less common than domestic Ancistrus strains, careful acclimation and long-term parameter stability are especially desirable.