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The Pseudacanthicus sp. L-097, also called Polka Dot Cactus, is a large South American loricariid valued for its spotted pattern and heavily armored appearance. Listed under the aquarium code L-097, it remains a rare fish in specialized stores. Its armored body, strong fin spines, and mainly nocturnal habits make it better suited to experienced aquarists. This wild-collected fish requires careful acclimation, warm and well-oxygenated water, and a layout made of rocks, roots, and secure shelters. Its adult size and territorial behavior should be considered before purchase.

General species description

Pseudacanthicus sp. L-097 is a large pleco belonging to the family Loricariidae. The L-097 code is an aquarium trade and identification code used for a Pseudacanthicus that is not presented here under an officially assigned species name. It is a robust bottom-dwelling fish that can become territorial, especially toward other loricariids using the same area. Activity usually increases after the lights go out, when it explores rocks and roots for food. This fish is rated **very rare**, which explains its irregular availability through specialty retailers. An aquarium for this pleco should provide substantial floor space, a stable layout, and several shelters because its body becomes large and powerful. Since specimens are collected from the wild, quarantine is especially worthwhile before introduction into an established aquarium.

Geographic origin and habitat

Pseudacanthicus sp. L-097 is associated with the Rio Xingu basin in Brazil, within an Amazonian environment characterized by warm, highly oxygenated water. Its habitat includes rocky areas, submerged boulders, and current-swept sections where the fish can hold onto surfaces with its sucker mouth. The bottom is generally mineral, with sand and gravel collecting between rocks; roots and submerged wood provide additional shelter. Aquatic plants are less dominant than rocky structures, especially in flowing areas. To reproduce these conditions, the aquarium should offer vigorous circulation, excellent filtration, and durable hiding places. A temperature of 26 to 30 °C and slightly acidic to neutral water generally suit its maintenance. Because it is wild collected, gradual acclimation and close observation are recommended.

Precise location and local name

The name L-097 is primarily an aquarium trade code, not an established Brazilian vernacular name. Fish sold under this designation are generally associated with the Rio Xingu area in Pará, but the L-097 label should be retained for specimen traceability. In the specialty trade, Polka Dot Cactus, L-097, and Pseudacanthicus sp. L-097 are used. The word cactus refers to the fish’s spiny, armored appearance, while Polka Dot describes its many contrasting spots. Its high rarity means that available shipments can be sporadic. Aquarists should record the L-097 code, the origin supplied by the seller, and the acquisition date. This information helps track stock and prevents different geographic forms from being mixed without records.

Appearance and physical characteristics

The body of Pseudacanthicus sp. L-097 is deep, broad, and protected by bony plates. Its base color is generally dark, covered with pale, rounded spots that give it the English name Polka Dot Cactus. The head is broad, the inferior mouth forms an effective sucker, and the fins carry strong rays. Odontodes, especially visible on the cheeks and caudal peduncle of mature males, reinforce its spiny appearance. The dorsal and pectoral fins may be spread during disputes or used to brace the fish in current. Adults can reach about 30 cm, sometimes more depending on rearing conditions and specimen origin. A large bottom area, spacious shelters, and a layout without sharp edges are therefore essential. Juveniles may appear discreet, but their body becomes imposing as they mature.

General diet

Pseudacanthicus sp. L-097 is mainly an omnivorous loricariid with a carnivorous tendency, using a variety of bottom-dwelling food resources. Its diet should include sinking, protein-rich pellets, frozen foods such as shrimp or krill, and small portions of mussel or other suitable marine foods. It also accepts plant matter, but it should not be treated as a simple algae eater. Meals are best offered after the aquarium lights go out, when activity increases. Excessively rich food or leftovers allowed to decay can quickly damage water quality. Remove uneaten food and maintain effective filtration. Juveniles and adults should receive regular meals without overfeeding. A varied diet supports healthy growth, while low oxygen and accumulated waste are poorly tolerated.

Essential data

• Native river: Rio Xingu
• Local name used: L-097
• Scientific name origin: Pseudacanthicus is the genus name used for this group of loricariids; sp. indicates an unspecified species in this designation.
• Full-name etymology: Pseudacanthicus approximately means false Acanthicus; sp. means species; L-097 is an aquarium code.
• Common or vernacular names: Polka Dot Cactus, Polka Dot Cactus Pleco, L-097
• Family: Loricariidae
• Subfamily: Hypostominae
• Name pronunciation: soo-doe-a-kan-thi-kus - ess pee L zero nine seven
• Discovery: —
• Maximum adult size: About 30 cm
• Water temperature and pH: 26 to 30 °C; approximately pH 5.5 to 7.5
• Stream appearance and surrounding vegetation: Warm, clear, highly oxygenated water; rocky habitat, current, roots, and limited aquatic vegetation in rocky sections.
• Typical tankmates: Large, peaceful Amazonian fishes that do not compete for bottom shelters.
• Temperament and behavior: Nocturnal, robust, and territorial toward competing loricariids.
• Water depth: —
• Sexual dimorphism: Mature males generally develop more extensive odontodes on the cheeks and body.
• Bottom structure and flow: Rocky, sandy-gravel bottom; moderate to strong flow with very well-oxygenated water.

In your aquarium

Success with Pseudacanthicus sp. L-097 depends on a very spacious aquarium, oversized filtration, and strong water circulation. Rock shelters and sturdy roots help reduce conflicts and give the fish secure retreats during daylight hours. Stable temperature, clean water, and a varied carnivorous diet are essential. Because this fish is very rare and wild collected, every specimen deserves careful quarantine and gradual acclimation. It is better suited to a specialized aquarium than to an ordinary community setup.