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Brochis robustus, also known as Corydoras robustus, is an Amazonian armored catfish from the family Callichthyidae. This species is recognized by its stocky body, bony plates, and sensitive barbels, which help it search for food along the bottom. Native to the Rio Purus in Brazil, it remains a highly sought-after aquarium fish because of its extreme rarity. Like other corydoras, it benefits from group housing, a soft substrate, clean water, and good oxygenation. Its peaceful nature makes it suitable for carefully planned community aquariums with other calm species.

General species description

Brochis robustus is a robust member of the South American armored catfishes. Its stocky, relatively deep body gives it a heavier appearance than many smaller corydoras. The species spends most of its time on the bottom, exploring the substrate with its barbels. It should be kept in a group of at least six individuals, which encourages more natural social behavior and activity. Peaceful by nature, it does not harass tankmates and is suitable for a community aquarium containing calm fish. Activity often increases after the lights are dimmed or during feeding. Substrate quality is important: fine sand or very smooth gravel helps protect the barbels from injury and abrasion. Because it is extremely rare in the trade, this species is best suited to aquarists looking for an unusual corydoras and prepared to provide careful long-term care.

Geographic origin and biotope

The species is associated with the Rio Purus, an important Amazon tributary in Brazil. Its natural environment belongs to the extensive Amazonian river network, where seasonal changes can affect water level, current, and clarity. As a bottom-dwelling fish, Brochis robustus uses slow to moderately flowing areas, especially where the substrate allows foraging. In an aquarium, soft to moderately mineralized water that is slightly acidic to neutral reproduces part of the conditions it requires. Efficient filtration, regular maintenance, and good oxygenation are essential, without creating an excessively strong current. The layout may include roots, clean leaf litter, and hardy plants, while leaving open areas along the bottom for feeding. Brazil is its known country of origin.

Precise locality and local name

The reference locality retained for Brochis robustus is the Rio Purus in the Brazilian Amazon basin. The most commonly used local or aquarium trade name remains Corydoras robustus, its former scientific combination. The name Brochis robustus is used in a classification in which some species formerly placed in Corydoras are grouped within Brochis. This dual naming explains why the fish may appear under different names in catalogues, import lists, and reference books. To avoid confusion, it is best to retain the full scientific name and verify the stated origin with the supplier. Its very limited availability makes it a species for aquarists who pay close attention to identification and fish provenance.

Appearance and physical characteristics

Brochis robustus has a compact body, a rounded belly, and a head adapted to life close to the bottom. Like other members of its family, it has rows of bony plates along the body and barbels around the mouth. These appendages help detect food particles in the substrate. The overall coloration is subdued, ranging from gray-brown to brownish, with darker markings that provide camouflage. The fins are relatively short, while the dorsal fin and body plates strengthen its armored appearance. Its particularly robust body shape is one of its distinguishing traits. A soft aquarium net is recommended because the fin spines can become entangled and cause injury. Sharp substrates should also be avoided, as they can damage the foraging barbels.

General diet

Brochis robustus is an omnivorous, detritus-feeding fish that actively searches the bottom for small food particles. In an aquarium, its diet should include quality sinking tablets, foods formulated for catfish, and frozen foods such as bloodworms or brine shrimp. Some meaty food supports growth and condition, while complete foods provide balanced nutrition. It should not be treated as a simple “clean-up fish”; it needs its own ration, offered after lights-out when necessary. Food should reach the bottom quickly so every individual can feed. Sinking food is especially useful for a group. Removing leftovers and avoiding overfeeding helps maintain clean water, which is essential for healthy barbels and digestion.

Essential data

• Native river: Rio Purus
• Local name used: Corydoras robustus
• Origin of the scientific name: The specific name was established when the species was described; the current name reflects its placement in the genus Brochis.
• Meaning of the full name: Brochis is the genus name; robustus is Latin for robust, referring to the fish’s stocky build.
• Common/vernacular names: Corydoras robustus; robust cory
• Family: Callichthyidae
• Subfamily: Corydoradinae
• Name pronunciation: bro-kiss roh-BUS-tus
• Discovery: Han Nijssen and Isaäc J. H. Isbrücker, 1980
• Maximum adult size: About 6 cm
• Water temperature and pH: 22 to 27 °C; pH 6.0 to 7.5
• Watercourse appearance and surrounding vegetation: Amazonian river habitat with calm areas, soft substrate, plant debris, and dense riparian vegetation.
• Typical tankmates: Peaceful small characins, small dwarf cichlids, calm catfish, and peaceful Amazonian midwater species.
• Temperament and behavior: Peaceful, social, and active near the bottom; it benefits from group living.
• Water depth: Shallow to moderately deep areas.
• Sexual dimorphism: Mature females are generally broader and more rounded than males, especially when viewed from above.
• Bottom structure and flow: Sand or smooth gravel with leaves and roots; low to moderate flow with good oxygenation.

In your aquarium

Success with Brochis robustus begins with a stable group, a non-abrasive bottom, and well-maintained water. Provide open areas for feeding while adding roots or plants for shelter. Avoid aggressive tankmates and fish large enough to intimidate or injure it. Because this species is extremely rare and offered exclusively by Ton.Fish in Canada, slow acclimation and a careful quarantine are sound practices. A varied sinking diet, regular water changes, and gentle but effective filtration will help maintain healthy barbels and natural behavior.