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Ancistomus snethlageae L-141, also called Ghost Pleco, is a South American loricariid associated with the Rio Tapajós in Brazil. Its dark, discreet appearance suits its common name, while the L-141 code reflects its identification in the aquarium trade before scientific classification. This bottom-dwelling fish has a ventral mouth adapted for grazing surfaces and regularly seeks shelter among roots, rocks, and crevices. It is a wild-collected species, offered less consistently than common plecos; its rarity is therefore intermediate. A mature, well-oxygenated aquarium with current is more appropriate than a uniform or stagnant setup. Stable water quality, hiding places, and an appropriate diet are central to its long-term care.

General species description

Ancistomus snethlageae L-141 is an armored catfish in the family Loricariidae, subfamily Hypostominae. It mainly occupies the bottom and uses its sucker mouth to hold onto rocks, wood, and other surfaces. Like several rheophilic loricariids, it benefits from clean, oxygen-rich water and regular circulation. Its activity is mostly crepuscular and nocturnal, although it may become visible during the day after acclimation. L-141 is peaceful with similarly sized fish, but each specimen should have access to suitable refuges. Because it is less consistently available, it is considered moderately uncommon in the hobby. It is best suited to aquarists able to maintain stable water quality over the long term.

Geographic origin and biotope

The species originates in Brazil, within the basin of the Rio Tapajós. Its natural habitat includes rocky areas and sections where current continually renews the water. Stones, submerged branches, and cavities provide resting surfaces and shelter. The bottom may contain coarse sand, gravel, and rocks, with localized accumulations of plant debris. Riparian vegetation contributes shade, while aquatic plants may not be abundant in fast, rocky sections. In an aquarium, it is more important to reproduce well-distributed current, strong oxygenation, and shelter than to create a densely planted layout.

Precise location and local name

The geographic reference used for Ancistomus snethlageae L-141 is the Rio Tapajós in Brazil. In the aquarium trade, the fish is mainly identified by the code L-141 and the English name Ghost Pleco. This trade name helps distinguish it from other Ancistomus, but the L-number does not replace the scientific name. No widely used Brazilian vernacular name is needed to identify it in the hobby. To prevent confusion, it is best to record Ancistomus snethlageae L-141, L-141, and Ghost Pleco together on stock lists, invoices, and breeding records.

Appearance and physical characteristics

Ancistomus snethlageae L-141 has a robust body covered with bony plates, a flattened head, and an inferior sucker mouth. Its overall coloration is dark, ranging from brownish gray to nearly black, with paler markings that may appear subtle depending on lighting, mood, and décor. The fins are proportioned to the body and provide good stability in current. Its outline is typical of a river pleco, with well-developed pectoral and dorsal fins. Pattern and coloration may vary among individuals, especially in wild fish. The combination of a ghostlike dark coloration and armored body explains the name Ghost Pleco. An adult size of about 15 cm is a practical planning reference for the aquarium.

General feeding

L-141 is an omnivorous grazer with a strong preference for biofilm and algae growing on rocks and wood. These natural resources should be supplemented with sinking foods containing plant matter, zucchini slices, or other appropriately prepared vegetables. Occasional richer foods, such as shrimp-based wafers or other protein sources, may be offered without becoming the main diet. Meals are best provided after the lights are dimmed, when the species becomes more active. A varied diet supports growth, body condition, and coloration. Wood in the aquarium also supports natural grazing behavior. Remove uneaten food to maintain clean water with a low organic load.

Essential data

• River of origin: Rio Tapajós
• Local name used: Ghost Pleco; L-141
• Origin of the scientific name: The genus name Ancistomus and the specific epithet snethlageae were assigned in the scientific description.
• Full-name etymology: Ancistomus refers to the fish’s morphology; snethlageae honors Emilie Snethlage.
• Common or vernacular names: Ghost Pleco
• Family: Loricariidae
• Subfamily: Hypostominae
• Name pronunciation: an sis toh moos sneth lah gee eye - el one forty one
• Discovery: Franz Steindachner, 1915
• Maximum adult size: About 15 cm
• Water temperature and pH: 25 to 29 °C; pH 6.0 to 7.5
• Watercourse appearance and surrounding vegetation: Clear water with noticeable current, rocky substrate, and riparian vegetation.
• Typical tankmates: Geophagus altifrons, Heros sp. Tapajos, Semaprochilodus insignis
• Temperament and behavior: Peaceful, discreet, mainly crepuscular and nocturnal; territoriality is mostly limited to shelter areas.
• Water depth: Benthic areas of shallow to moderate depth.
• Sexual dimorphism: Mature males may have a broader head and more developed odontodes; sexing can be difficult.
• Bottom structure and flow: Rocks, gravel, coarse sand, and submerged wood; moderate to strong flow with well-oxygenated water.

In your aquarium

To succeed with Ancistomus snethlageae L-141, provide a spacious, mature, well-filtered aquarium with several cavities, stable rocks, and natural wood. Strong circulation and high oxygenation are especially important, along with regular water changes. Feed it after dark with a combination of plant-based foods, complete sinking wafers, and small protein-rich portions. Avoid aggressive or highly competitive bottom-dwellers. Since this is a wild-collected fish with intermediate availability, acclimation should be gradual and the specimen should be watched carefully during its first weeks.