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Panaque nigrolineatus L-191, also known as Broken-line Royal Panaque, is a large South American loricariid valued for its contrasting pattern and reserved behavior. Native to Colombia, it inhabits forest waterways where current, submerged wood, and rocky surfaces shape its environment. This fish has an effective sucker mouth for grazing surfaces and teeth suited to rasping wood. The specimens offered are wild-caught. With a rarity level of 1, this form is relatively accessible through the specialty trade, but its adult size requires serious planning before purchase.

General species description

Panaque nigrolineatus L-191 is an armored catfish from the family Loricariidae, within the subfamily Hypostominae. It belongs to the larger Panaque and has a sturdy body, broad head, and generally calm disposition. Activity increases mostly at dusk, when it explores the décor and searches for food. Despite its peaceful temperament, it can become territorial toward conspecifics or fish competing for the same shelters. A large, well-oxygenated aquarium furnished with natural wood is essential. Efficient filtration is also important because its diet and substantial body create a significant organic load.

Geographic origin and biotope

The species is associated with the Orinoco and upper Amazon basins; the L-191 form is generally linked to the Río Caquetá in Colombia. It inhabits forested areas with shaded banks, submerged trunks, rocks, and moderate to strong current. The water is generally warm, soft to moderately mineralized, and slightly acidic to neutral. In nature, plant matter and submerged wood provide both food and shelter. In the aquarium, steady circulation, strong oxygenation, and secure hiding places reproduce these conditions better than a merely decorative setup.

Precise locality and local name

L-191 is commonly associated with the Río Caquetá in southern Colombia, an important tributary of the Amazon basin. In the aquarium trade, it is mainly identified by the L-191 number, Royal Panaque, or Broken-line Royal Panaque. Local names may vary between regions and collectors, so the L-number is especially useful for distinguishing this form from other lined Panaque. Trade identification does not replace a detailed scientific determination, since several related forms may display similar patterns.

Appearance and physical characteristics

The body of Panaque nigrolineatus L-191 is stocky, flattened underneath, and protected by bony plates. The background color ranges from grayish brown to olive brown, with irregular dark lines that often become interrupted or broken in the L-191. The head is broad, the fins are sturdy, and the lower mouth forms a sucker adapted for gripping surfaces. The fin spines can injure fish or aquarists during handling. Its most distinctive feature is the combination of large adult size, massive body shape, and discontinuous black lines.

General diet

This species is mainly herbivorous and detritivorous, with a strong preference for soft submerged wood. Wood should not be treated as a simple decoration: it contributes to digestion and allows natural grazing behavior. Regularly offer vegetable-based wafers, zucchini, cucumber, green beans, and other suitable plant foods. A sinking ration can be provided in the evening, when the fish becomes active. Meaty foods should represent only a limited portion of the diet. A varied, fiber-rich diet offered without competition is essential for long-term health.

Essential data

• River of origin: Río Caquetá
• Local name used: Royal Panaque; aquarium number L-191
• Origin of the scientific name: Panaque is a South American vernacular name adopted for the genus; nigrolineatus describes the fish’s black lines.
• Etymology of the complete name: Panaque, a local usage name; nigro, black; lineatus, marked with lines.
• Common/vernacular names: Broken-line Royal Panaque, Royal pleco, Royal Panaque
• Family: Loricariidae
• Subfamily: Hypostominae
• Name pronunciation: pa-na-kay nig-roh-li-nee-ah-tus
• Discovery: Wilhelm Karl Hartwich Peters, 1877
• Maximum adult size: approximately 40 cm
• Water temperature and pH: 24 to 30 °C; pH 6.0 to 7.5
• Watercourse appearance and surrounding vegetation: shaded forest waters, submerged trunks, rocks, and dense riparian vegetation
• Typical tankmates: midwater Amazonian characins, peaceful similarly sized cichlids, and non-territorial catfish
• Temperament and behavior: generally peaceful, nocturnal, and territorial around shelters
• Water depth: banks, channels, and wooded areas of variable depth
• Sexual dimorphism: mature males often have broader heads and more developed odontodes; identification can be difficult
• Bottom structure and flow: rocky or sandy-muddy bottom, submerged wood, and moderate to strong current

In your aquarium

Success begins with a very spacious aquarium, a stable layout, and plenty of real wood. Maintain warm, clean, well-oxygenated water, then offer fiber-rich vegetable foods after the lights go out. Provide several shelters to reduce territorial competition. Because this is a large wild fish, acclimation and water quality deserve particular attention. Its purchase should be planned for the long term, since its adult size quickly exceeds the capacity of an ordinary community aquarium.