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Aspidoras rochai, also called Loach Catfish, is a small South American catfish from the Callichthyidae family. Native to Ceará, Brazil, it inhabits shallow freshwater environments where it searches the bottom with its barbels. Its armored body, small adult size, and peaceful behavior make it an appealing inhabitant for a carefully planned community aquarium. This species remains very rare in the aquarium trade, increasing its value for specialists. Like many small armored catfish, it should be kept in a group, over soft substrate, and in clean, well-oxygenated water.

General species description

Aspidoras rochai is a small benthic catfish in the genus Aspidoras and is closely related to Corydoras. It spends much of its time near the bottom, probing the substrate with its barbels. Its behavior is generally peaceful and social, so it should be kept in a small group rather than alone. It is suitable for a calm community aquarium without aggressive or predatory tank mates. With a rarity rating of 3, or very rare, it is mainly sought by aquarists interested in less common species.

Geographic origin and biotope

This species comes from Brazil, specifically the state of Ceará in the northeastern part of the country. It is associated with small streams and quieter sections of coastal drainage, where water may be clear to slightly stained. The habitat generally includes sand or fine gravel, plant debris, and streamside vegetation that provides shade. In an aquarium, good oxygenation, effective filtration, and moderate flow are preferable to excessive water movement.

Precise location and local name

Aquarium references associate Aspidoras rochai with the rio Cocó basin near Fortaleza, Ceará. The Brazilian name “cascudinho” may be used generally for small armored catfish, but it is not necessarily exclusive to this species. The English name Loach Catfish is used in the aquarium trade. Wild populations occupy restricted habitats, which partly explains why the species is uncommon in the hobby.

Appearance and physical characteristics

Aspidoras rochai has a short, stocky body protected by two rows of lateral bony plates. Its base coloration is generally beige to brownish, with irregular dark markings that help it blend into the substrate. The lower mouth bears sensory barbels used to locate food. The pectoral and dorsal fins contain stiff rays that can prick the skin; avoid tightly woven nets and handle the fish carefully during maintenance or transport.

General diet

Aspidoras rochai is a bottom-feeding omnivore that searches for small organisms, larvae, worms, and organic material in the substrate. In aquaria, its diet should be based on quality sinking foods, supplemented with frozen foods such as bloodworms or brine shrimp. It should never be relied upon to remove waste or other fish’s excrement. Feeding after the lights have been partially dimmed helps the group eat without excessive competition.

Essential data

• Name of original river: rio Cocó
• Local name used: cascudinho
• Origin of the scientific name: Aspidoras is the genus name; rochai is the specific epithet.
• Full-name etymology: Aspidoras comes from Greek roots referring to shield-like armor or skin; rochai is a dedication to a person named Rocha.
• Common/vernacular names: Loach Catfish; cascudinho
• Family: Callichthyidae
• Subfamily: Callichthyinae
• Name pronunciation: ass-pee-DORE-ass - ROH-kai
• Discovery: Alípio de Miranda-Ribeiro, 1942
• Maximum adult size: approximately 3.5 cm
• Water temperature and pH: 22 to 27 °C; pH 6.0 to 7.5
• Stream appearance and surrounding vegetation: small slow to moderately flowing streams, fine mineral substrate, plant debris, and streamside vegetation
• Typical tank mates: Geophagus brasiliensis, Hoplias malabaricus, Megalechis thoracata
• Temperament and behavior: peaceful, bottom-oriented, and social
• Water depth: shallow to moderate
• Sexual dimorphism: mature females are generally broader and more rounded than males, especially when viewed from above
• Bottom structure and flow: sand or fine gravel, organic debris, and low to moderate current

For greater success

To keep Aspidoras rochai successfully, provide a mature aquarium with very soft substrate, hiding places, and moderate water movement. Keeping several specimens encourages natural and confident behavior. Maintain stable, well-oxygenated water with low waste levels, and offer a varied sinking diet on a regular basis. Because this species is very rare and may originate from targeted collection, pay close attention to its source and transport conditions when purchasing it.