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Introduction

Ancistrus sp. L-519, also known as Rio Itenez, is a South American loricariid associated with the Rio Iténez basin in Bolivia. Listed under the L-519 number, this fish remains an Ancistrus sp. form kept in the aquarium trade before a possible complete scientific identification. Its sucker-mouth catfish shape, discreet behaviour and affinity for natural aquascapes make it an interesting subject for loricariid enthusiasts. Classified as Very rare and offered exclusively by Ton.Fish in Canada, it deserves careful maintenance, stable water, sheltered areas and a varied diet with a strong vegetable component.

General species description

Ancistrus sp. L-519 is a freshwater catfish from the genus Ancistrus, recognized by its sucker mouth and ability to hold onto aquarium surfaces. The L-519 code identifies a “L-number” form, while the Rio Itenez name refers to its geographic origin. Like many bristlenose plecos, it is most active at dusk and at night and benefits from an aquarium with narrow shelters, roots and good oxygenation. Its Very rare status makes it best suited to aquarists who pay close attention to water quality and fish traceability.

Geographic origin and biotope

The L-519 form is associated with the Rio Iténez in Bolivia, within the Amazon basin. This type of tropical river may include quiet areas, wooded banks, submerged roots and changing current zones influenced by seasonal conditions. In the aquarium, a similar atmosphere can be created with wood, smooth stones and shelters, while maintaining regular circulation and well-oxygenated water. Plant material and surfaces covered with biofilm also provide natural resources appreciated by bristlenose plecos.

Precise locality and local name

The local name used in the aquarium trade is Rio Itenez, an appellation directly connected with the Rio Iténez. The L-519 number distinguishes this form among the many ancistrus identified by L-codes. A more detailed locality is not retained here. To preserve its aquarium value, it is preferable to keep the complete name Ancistrus sp. L-519 L-519 and avoid mixing this strain with ancistrus from different origins.

Appearance and physical characteristics

Ancistrus sp. L-519 has the typical ancistrus body plan: a flattened body, well-developed fins, bony plates and a ventral mouth adapted for attachment. Its shape allows it to remain on wood, stones and glass when the current becomes stronger. In adult males of the genus, facial tentacles on the snout generally become visible; females have fewer or none. The exact colour pattern of this L-number form may vary with age, lighting, mood and strain origin. A dark, natural layout helps reveal its details.

General diet

The diet should be based on varied vegetable foods: algae wafers, sinking foods for herbivorous grazers, zucchini, cucumber or other suitably prepared vegetables. More protein-rich sinking foods can be offered periodically, especially to juveniles and breeding fish, but should not replace the vegetable portion. A genuine piece of driftwood is useful for biofilm grazing and fibre intake. Feed mainly after the lights go out to match its crepuscular activity and prevent tank mates from consuming all the food.

Essential data

• Name of the original river: Rio Itenez
• Local name used: Rio Itenez
• Origin of the scientific name: Ancistrus sp. indicates a form of the genus Ancistrus whose species identification is not specified; L-519 is an aquarium-trade number.
• Etymology of the full name: Ancistrus comes from Greek and refers to a hook; sp. means unspecified species; L-519 is the number assigned to this form; Rio Itenez refers to its source river.
• Common and vernacular names: Rio Itenez
• Family: Loricariidae
• Subfamily: Hypostominae
• Pronunciation: an-SIS-truss sp. el five one nine
• Origin: Bolivia
• Water temperature and pH: stable tropical water; aim for approximately 24 to 28 °C and a near-neutral pH.
• River appearance and surrounding vegetation: tropical watercourse bordered by riparian vegetation, with wood, roots and areas of changing current.
• Temperament and behaviour: generally peaceful and discreet, mainly active at dusk and at night; it grazes surfaces and uses shelters.
• Bottom structure and flow: non-abrasive substrate, wood and refuges; regular circulation with good oxygenation.
• Rarity: Very rare
• Availability: Exclusive at Ton.Fish in Canada

In your aquarium

For successful care of Ancistrus sp. L-519, choose a mature, well-filtered and stable aquarium with clean water, roots and several shelters. Regular vegetable feeding in the evening supports its condition and reduces competition with other fish. Avoid overcrowding and aggressive tank mates that could prevent it from reaching surfaces and food. Because it is Very rare and exclusive at Ton.Fish in Canada, slow acclimation and close monitoring of water parameters are especially important.