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Squaliforma emarginata L-011, also known as Redfin Thresher, is a Brazilian loricariid valued for its sturdy body and reddish fins. Associated with the Rio Araguaia, this bottom-dwelling catfish uses well-oxygenated areas and shelters formed by wood, rocks, and current breaks. Its generally peaceful behavior suits a spacious aquarium with strong filtration, moderate flow, and plenty of cover. Since this is a wild-collected species with an intermediate rarity level, careful acclimation, varied feeding, and stable water conditions are especially important. Keeping the L-011 code with the scientific name helps preserve the fish’s identity in the aquarium trade.

General description

Squaliforma emarginata L-011 is an armored catfish in the family Loricariidae, known in the aquarium trade under the L-011 code. It belongs to the sucker-mouthed loricariids, using its ventral mouth to hold onto rocks and other solid surfaces. The species develops a robust, flattened body and remains primarily associated with the bottom. It is appreciated for its reddish fins and its discreet behavior, although it becomes easier to observe when the aquarium lighting is reduced. Its rarity level, rated at 2 out of 3, places it among the less commonly encountered fish in the specialized trade. A mature, well-oxygenated aquarium with moderate current is preferable to a stagnant setup with little shelter.

Geographic origin and habitat

Native to Brazil, Squaliforma emarginata L-011 is associated with the Rio Araguaia basin, an important river system in the Brazilian interior. In this type of habitat, the fish stays near the bottom around rocks, submerged wood, and margins where current strength changes. The water is generally warm, variably mineralized, and well oxygenated in flowing sections. For aquarium keeping, a temperature of 24 to 29 °C, a pH around 6.5 to 7.5, and efficient filtration provide a suitable starting point. A layout combining smooth stones, roots, and shaded areas recreates its environment more effectively than a completely open aquarium.

Precise location and local name

The most useful locality information for Squaliforma emarginata L-011 is the Rio Araguaia in Brazil. In the aquarium trade, the code L-011 identifies this form or population before consistent use of the scientific name. In Brazil, loricariids are commonly called cascudo, a popular term associated with their armored bodies. The English name Redfin Thresher refers to the reddish fin coloration and the fish’s tapered tail profile. To maintain reliable identification, it is best to keep the L-011 code alongside the scientific name when purchasing, transporting, or exchanging specimens.

Appearance and physical characteristics

Squaliforma emarginata L-011 has a body covered with bony plates, a broad head, and a ventral sucker mouth. The base coloration is generally dark, brownish, or grayish, with contrast varying according to age, condition, and locality. The red-tinted fins, especially on the caudal and unpaired fins, explain its common name. Its body shape is adapted to life on the bottom and movement in flowing water. Odontodes and body plates reinforce its armored appearance. As with many loricariids, coloration can fade during shipping and intensify in a darker, well-structured aquarium. Smooth surfaces and sheltered areas allow the fish to rest without damaging its underside.

General diet

In the aquarium, Squaliforma emarginata L-011 should receive a varied diet rather than being treated as a simple algae eater. Suitable foods include sinking wafers for bottom fish, vegetable-based tablets, blanched vegetables, and some protein-containing foods. Natural wood is recommended in the layout because it is an important resource for many loricariids and provides grazing surfaces. Feedings are best offered after the lights go out, when activity usually increases. A consistent diet supports good body condition, but uneaten food should be removed to prevent water quality problems. Young fish benefit from frequent, modest portions. Offering food in several sheltered locations can also reduce competition with other bottom-dwelling fish.

Essential data

• River of origin: Rio Araguaia
• Local name: Cascudo
• Origin of the scientific name: Squaliforma emarginata
• Etymology of the full name: Squaliforma suggests a shark-like form; emarginata means emarginate or notched along an edge.
• Common or vernacular names: Redfin Thresher; Cascudo; L-011
• Family: Loricariidae
• Subfamily: Hypostominae
• Name pronunciation: skwah-li-FOR-mah - eh-mar-jin-AH-tah
• Discovery: Achille Valenciennes, 1840
• Maximum adult size: about 30 cm
• Water temperature and pH: 24 to 29 °C; pH 6.5 to 7.5
• Watercourse appearance and surrounding vegetation: warm flowing water with rocky areas, submerged wood, and riparian vegetation.
• Typical tankmates: Laetecara araguaiae; Cichla piquiti; Geophagus altifrons; Leporinus fasciatus
• Temperament and behavior: generally peaceful, bottom-oriented, discreet, and more active at dusk or during the night.
• Water depth: bottom areas associated with rocks, wood, and shelter.
• Sexual dimorphism: mature males may develop more pronounced odontodes; young fish are difficult to sex.
• Bottom structure and flow: rocky or sandy-gravel substrate, submerged wood, and moderate to strong flow.

In your aquarium

Success with Squaliforma emarginata L-011 depends on a sufficiently large aquarium, clean, highly oxygenated water, and a layout with several shelters. Because this is a wild-collected species, slow acclimation and close observation are recommended on arrival. Wood, smooth rocks, and evenly distributed current encourage natural behavior. Feed after the lights go out with vegetable-based and complete foods, then monitor body condition. Avoid excessive competition along the bottom and aggressive tankmates. Its intermediate rarity also makes it worthwhile to preserve the L-011 identification carefully. Stable maintenance is more important than chasing exact chemistry values.