Brochis arcuatus C20

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The Brochis arcuatus C20, also known as the Skunk Cory, is a small South American catfish valued for its elegant shape and dark arched stripe running across the back. Peaceful, social and most active near the bottom, it is well suited to carefully planned community aquariums. This form is moderately uncommon in the aquarium trade, making it an interesting find for keepers of less frequently offered corydoras. The specimens offered here are wild collected; careful acclimation and stable water are therefore especially important when they arrive.

General species description

Brochis arcuatus C20 is a bottom-dwelling catfish belonging to the family Callichthyidae. It lives in groups and constantly explores the substrate with its barbels, although it does not clean aquarium waste. Its behavior is generally peaceful and social, and it becomes more confident when kept in a group of at least six individuals. It alternates between searching for food on the bottom and brief trips to the surface to gulp air, a natural behavior in several corydoras. In the aquarium, it appreciates a quiet layout, effective filtration and shaded areas. Because its mouth and barbels are delicate, a fine, smooth sand substrate is essential. Its intermediate rarity in the trade makes it less consistently available than the most common captive-bred species.

Geographic origin and biotope

Brochis arcuatus C20 is associated with the fresh waters of Colombia, in the Amazon basin. It occurs in quiet or moderately flowing sections of small forest streams, especially along margins and in areas where sand, leaves and plant debris collect. The water may be clear or slightly stained by organic matter, with light filtered by vegetation along the banks. Flow and water levels can change considerably with the seasons. In the aquarium, it is better to recreate the key habitat features rather than overdecorate: a sandy bottom, roots, leaves and open areas for foraging. Good oxygenation and water free of accumulated nitrogenous waste support long-term care.

Precise locality and local name

In the aquarium trade, the most commonly used name is Skunk Cory, referring to the dark stripe that resembles a dorsal skunk stripe. The code C20 belongs to the aquarium nomenclature used for corydoras and helps identify this form in hobbyist exchanges. The name Corydoras arcuatus is also still widely used, although modern classifications may place the species in the genus Brochis. To avoid confusion, it is best to keep the scientific name, trade name and C20 code together when purchasing fish. Wild specimens may show differences in coloration related to their origin, acclimation condition and lighting.

Appearance and physical characteristics

Brochis arcuatus C20 has a stocky body protected by two rows of bony plates. Its base color ranges from beige-silver to pale gray, with a black arched stripe beginning around the head and following the dorsal line toward the base of the caudal fin. The fins are generally translucent and may appear slightly yellowish depending on conditions. The barbels around the mouth help detect food in the substrate. As with other corydoras, the spines of the dorsal and pectoral fins can catch in a net, so careful handling is required. Its adult size remains modest, but its robust body and contrasting pattern give it a striking presence in a community aquarium.

General feeding

Brochis arcuatus C20 is an opportunistic omnivore that searches for small organisms, larvae, worms and organic matter in the substrate. In the aquarium, its diet should be based on quality sinking foods, supplemented with frozen or live foods such as bloodworms, brine shrimp and daphnia. Do not rely on leftovers from other fish or algae to feed it properly. Offering food after the lights have been partially dimmed may help it eat, especially in a competitive aquarium. Portions should be consumed quickly to prevent waste from accumulating. A varied diet helps maintain body condition and supports breeding readiness in adults.

Essential data

• River of origin: Colombian Amazon basin
• Local name used: Skunk Cory
• Origin of the scientific name: Brochis is a historical generic name; arcuatus is Latin for arched.
• Etymology of the full name: Brochis, the genus name; arcuatus, referring to the curved dorsal stripe.
• Common/vernacular names: Skunk Cory, Corydoras arcuatus
• Family: Callichthyidae
• Subfamily: Corydoradinae
• Name pronunciation: bro-kiss ar-koo-ah-tus
• Discovery: Elwin, 1939
• Maximum adult size: About 5 cm
• Water temperature and pH: 22 to 27 °C; pH 6.0 to 7.5
• Stream appearance and surrounding vegetation: Small forest streams, subdued light, roots, leaf litter and dense vegetation along the banks.
• Typical tankmates: Small peaceful characins, dwarf cichlids, pencilfish, other calm corydoras and small non-territorial loricariids.
• Temperament and behavior: Very peaceful, social, active near the bottom and more confident in a group.
• Water depth: Shallow to intermediate areas of streams.
• Sexual dimorphism: Adult females are generally broader and deeper-bodied; males are often smaller and more slender.
• Bottom structure and flow: Fine sand, leaves and plant debris; low to moderate flow with good oxygenation.

In your aquarium

To keep Brochis arcuatus C20 successfully, use a mature, clean and well-oxygenated aquarium with a sufficiently large group. Soft sand, root-based shelters and a varied sinking diet should be priorities. Avoid aggressive fish, abrasive substrates and waste accumulation that may damage the barbels. Because these are wild-collected specimens, slow acclimation, preventive quarantine and close monitoring of water parameters are recommended. Stable temperature and water chemistry will encourage confidence, natural behavior and long-term health.