Panaque nigrolineatus L-190

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The Royal Panaque, known scientifically as Panaque nigrolineatus L-190, is a large South American loricariid valued for its dark lines and sturdy body. This nocturnal fish spends most of its time on the bottom, where its sucker mouth allows it to graze on wood and algae-covered surfaces. L-190 identifies a commercial form within the “L-number” system used for aquarium loricariids. This wild-collected species is offered less regularly than common plecos, making it a sought-after choice for experienced aquarists. Its adult size and need for wood require careful long-term planning.

General species description

Panaque nigrolineatus L-190 is a large, heavily built and mainly nocturnal loricariid. During the day, it usually shelters beneath roots, branches or rocks, becoming more active after the lights go out. It is generally peaceful toward midwater fish, but it may defend a shelter from other large plecos, especially in a confined aquarium. A spacious, well-oxygenated aquarium with several retreats is essential. Real wood is important because it contributes to feeding and digestion. With its slow growth and potentially long lifespan, this fish is better suited to a long-term aquarium project than to a temporary setup.

Geographic origin and biotope

This species is associated with the Orinoco basin, particularly in Colombia. It inhabits tropical waterways where roots, submerged logs and rocks provide grazing surfaces and shelter. The water is generally warm, well oxygenated and soft to slightly acidic or neutral. Current may be moderate to strong in places, especially around obstacles and rocky areas. Natural surroundings include forested banks, fallen branches and dense riparian vegetation, providing shade and adding plant debris to the habitat.

Precise location and local name

L-190 is generally associated with the Colombian section of the Orinoco basin, in river habitats with hard bottoms and abundant submerged wood. In the Colombian aquarium trade, the names cucha real and corroncho royal may be used for large loricariids, while Royal Panaque is the common international name. Trade names do not replace scientific identification, since several Panaque populations can look similar. The L-190 designation therefore remains useful for distinguishing this form in the specialist trade.

Appearance and physical characteristics

The body is stocky, flattened underneath and covered with bony plates. The base colour ranges from olive brown to greyish brown, with black longitudinal lines running across the body and head. The fins also carry dark markings, which may be more contrasting in juveniles. Its underslung sucker mouth is adapted for grazing on hard surfaces. The pectoral and dorsal fins are strong, and their spiny rays provide protection. As an adult, it becomes an imposing fish requiring substantial bottom space and shelters large enough for its body.

General diet

Panaque nigrolineatus L-190 is mainly herbivorous and xylophagous, with a strong dependence on soft submerged wood. It also grazes algae, biofilm and plant matter deposited on surfaces. In aquariums, offer sinking spirulina-based wafers, vegetable foods and vegetables such as zucchini, cucumber or sweet potato. A small amount of protein-rich food can supplement the diet, but should not dominate it. Feed in the evening, when the species is most active. Wood should always be available, and the water should remain clean to reduce digestive problems.

Essential data

• Original river name: Orinoco River basin
• Local name used: Cucha real; corroncho royal
• Origin of the scientific name: Genus name associated with South American names for plecos; descriptive Latin species epithet
• Full-name etymology: Panaque is a reported Indigenous name for these fishes; nigrolineatus means “black-lined”; L-190 is a trade number in the L-number system
• Common/vernacular names: Royal Panaque; Royal Pleco
• Family: Loricariidae
• Subfamily: Hypostominae
• Name pronunciation: pa-na-ke nig-ro-li-nee-ah-tuss
• Discovery: Wilhelm Karl Hartwich Peters, 1877
• Maximum adult size (cm): About 43 cm
• Water temperature and pH: 24 to 29 °C; pH 6.0 to 7.5
• Watercourse appearance and surrounding vegetation: Warm, well-oxygenated tropical waterways bordered by riparian vegetation, with roots and submerged logs
• Typical tankmates: Peaceful large characins, non-aggressive South American cichlids, midwater catfish and other robust Orinoco-basin species
• Temperament and behaviour: Generally peaceful, nocturnal and territorial around shelters
• Water depth: Shallow to medium-depth areas near logs, roots and shelter
• Sexual dimorphism: Adult males often have broader heads and more developed odontodes; sexing may be difficult
• Bottom structure and flow: Sand, gravel, stones and wood; moderate to strong flow depending on the area

In your aquarium

To keep Panaque nigrolineatus L-190 successfully, provide a large, mature aquarium, efficient filtration and excellent oxygenation. Offer several shelters, plenty of natural wood and vegetable foods in the evening. Avoid direct competition with several large plecos in a confined space. Regular water changes, stable temperature and clean substrate will support good health. Because this is a wild-collected species, gradual acclimation and close observation during the first weeks are especially important.