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Ancistrus hoplogenys L-059 is a South American loricariid associated with the Rio Guamá in Brazil. Known in the aquarium hobby by the L-059 number, it is recognized by its armored body, ventral sucker mouth and mainly bottom-dwelling behavior. This form remains relatively uncommon in the specialty trade, making it appealing to aquarists looking for a less frequently encountered Ancistrus than the usual captive-bred varieties. The specimens offered here are wild-collected; gradual acclimation, well-oxygenated water and a varied vegetable diet are therefore especially important.

General description of the species

Ancistrus hoplogenys L-059 belongs to the sucker-mouth catfish of the genus Ancistrus. Like other members of the group, it spends most of its time near the bottom and uses its mouth to attach itself to surfaces, graze on biofilm and algae and inspect shelters. Its body is protected by bony plates, while its fins carry stiff rays. It is generally peaceful toward other fish, although it may defend a shelter from another Ancistrus, especially in a confined space. In an aquarium, it appreciates a layout with several hiding places and steady water movement. Activity often increases around the time the lights go out.

Geographic origin and biotope

This species comes from Brazil, in the Rio Guamá basin of eastern Amazonia. It is associated with river sections where the bottom provides grazing surfaces and cavities for retreat. The biotope typically includes submerged wood, stones and leaf litter, with tropical streamside vegetation shading part of the waterway. To recreate these conditions, provide warm, clean and well-oxygenated water, moderate flow and several appropriately sized shelters. Natural wood also helps structure the aquarium layout and offers an additional grazing surface.

Precise locality and local name

The reference locality provided for Ancistrus hoplogenys L-059 is the Rio Guamá in Brazil. In its country of origin, loricariids of this type are commonly called cascudo, a general vernacular name that does not refer only to this species. In international aquaria, the L-059 designation helps distinguish this form from other commercial Ancistrus when the species is presented with its maintenance code. This information is particularly useful for wild fish, whose geographic origin is important when keeping track of their lineages.

Appearance and physical characteristics

Ancistrus hoplogenys L-059 has the typical Ancistrus shape: a stocky body, flattened underside and broad head with a ventral sucker mouth. The base colour is generally brownish grey to dark brown, with darker markings that help the fish blend into wood and bottom surfaces. The fins are supported by stiff spine-like rays and the body is covered with bony plates. In adult males, the fleshy tentacles on the head become a particularly visible feature; in females, they are absent or much less developed.

General diet

Its diet should be based on varied vegetable foods: spirulina wafers, herbivore tablets, blanched vegetables and natural growth developing on the aquarium surfaces. It grazes on biofilm and algae, but should not be treated as a simple algae eater that can survive on leftovers. Regular offerings of zucchini, cucumber or spinach can supplement the diet. A small amount of protein-rich food may be offered occasionally, especially to juveniles, without replacing the vegetable component. Natural wood is recommended in the layout, both as a grazing surface and as a refuge.

Essential data

• Name of the river of origin: Rio Guamá
• Local name used: Cascudo
• Origin of the scientific name: Ancistrus hoplogenys
• Full-name etymology: Ancistrus comes from the Greek ankistron, meaning hook; hoplogenys combines hoplon, weapon, and genys, jaw or cheek.
• Common/vernacular names: Cascudo; Ancistrus L-059
• Family: Loricariidae
• Subfamily: Hypostominae
• Name pronunciation: an SIS truss - hop loh JEN iss
• Discovery: Albert Carl Lewis Gotthilf Günther, 1866
• Maximum adult size: About 15 cm
• Water temperature and pH: 24 to 28 °C; pH 6.0 to 7.5
• Stream appearance and surrounding vegetation: Shaded tropical waterway with submerged wood, leaf litter and dense streamside vegetation.
• Typical tankmates: Peaceful small characins; small Amazonian cichlids; non-aggressive bottom-dwelling catfish; large adult shrimp.
• Temperament and behaviour: Peaceful, mainly nocturnal or crepuscular; territorial around shelters.
• Water depth: Shallow to moderate benthic areas.
• Sexual dimorphism: Males develop tentacles on the head; females have a smoother head and are often rounder-bodied.
• Bottom structure and flow: Wood, leaves, stones and soft substrate; moderate flow with well-oxygenated water.

In your aquarium

For successful care of Ancistrus hoplogenys L-059, set up a mature aquarium with natural wood, hiding places and moderate flow. Stable, warm and well-oxygenated water is essential, as is feeding vegetable foods after the lights go out. Because these are wild-collected fish, pay particular attention to quarantine, acclimation and body-condition monitoring. Avoid excessive competition among several bottom-dwelling fish and provide enough shelters to reduce territorial conflicts.