Hoplisoma loretoensis

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Hoplisoma loretoensis, also known as Corydoras loretoensis, is a small armoured catfish from northeastern Peru. Like other members of its group, it has bony plates, sensory barbels and an active bottom-dwelling lifestyle. This species remains uncommon in the aquarium trade, making it an interesting choice for keepers looking beyond the most familiar Corydoras. Peaceful and social, it does best in a group over a soft substrate, with clean, well-oxygenated water. The specimens offered here are wild collected and should be acclimated carefully after arrival.

General description

Hoplisoma loretoensis is a small bottom-dwelling catfish belonging to the family Callichthyidae. It lives in groups and spends much of its time examining the substrate with its barbels. Its activity alternates between searching for food along the bottom and making brief trips to the surface, a normal behaviour in Corydoras. In an aquarium, it should be kept with several conspecifics to encourage natural activity. Its moderately rare availability makes it less commonly encountered than popular species of the genus. Since wild fish are involved, quarantine and gradual acclimation are strongly recommended.

Geographical origin and biotope

The species is associated with the Loreto Department of Peru, within the Amazon drainage. It inhabits tropical freshwater streams and small to medium waterways, where the bottom is generally made up of fine sand, light silt and plant debris. Wood, leaf litter and riverside vegetation provide shelter and add organic matter to the habitat. To recreate these conditions, provide warm, soft to moderately acidic water, efficient filtration and gentle to moderate flow. Wild fish also benefit from shaded areas and natural cover.

Precise location and local name

The specific name clearly connects this Corydoras with Loreto, in the Peruvian Amazon. In the trade and among aquarists, it is mainly identified by its scientific name or by the former name Corydoras loretoensis. No widely established Peruvian vernacular name is commonly used for this species. Commercial labels may therefore vary, and identification should ideally consider geographic origin, colour pattern and body form. This is especially useful with small Peruvian Corydoras, which can be difficult to distinguish when young or stressed.

Appearance and physical characteristics

Hoplisoma loretoensis has the compact, slightly flattened body typical of Corydoras and is protected by two rows of bony plates. Its inferior mouth carries sensitive barbels used to locate food in sand. Its pectoral fins contain a spine that can cause a painful puncture during handling; use a suitable net whenever possible. The overall colouration is subdued, with darker contrasts over a lighter background that help camouflage the fish against the substrate. Its adult size remains small, making it suitable for carefully planned community aquariums.

General diet

This Corydoras is an opportunistic omnivore that searches for small prey and organic debris on the bottom. In an aquarium, provide a varied diet of quality sinking tablets, fine granules and regular frozen foods such as bloodworms or brine shrimp. Live foods can stimulate activity and improve the condition of breeding fish. Do not rely on leftovers from other tank mates: every fish must be able to reach its portion. Feed small amounts, preferably as the lights dim, and remove excess food to protect water quality.

Essential data

• Original river: Nanay
• Local name used: Corydoras loretoensis
• Origin of the scientific name: The genus Hoplisoma and the geographic epithet loretoensis
• Etymology of the full name: Hoplisoma comes from the Greek hoplon, shield, and soma, body; loretoensis means originating from Loreto
• Common or vernacular names: Corydoras loretoensis; Loreto Corydoras
• Family: Callichthyidae
• Subfamily: Corydoradinae
• Name pronunciation: hop lee SOH ma lor eh toh EN sis
• Discovery: Isaäc J. H. Isbrücker and Han Nijssen, 1986
• Maximum adult size: Approximately 4 cm
• Water temperature and pH: 22 to 27 °C; pH 6.0 to 7.5
• Waterway appearance and surrounding vegetation: Tropical freshwater, fine substrate, plant debris, wood and riverside vegetation
• Typical tank mates: Corydoras agassizi, Brochis splendens, Hyphessobrycon loretoensis
• Temperament and behaviour: Peaceful, social, active on the bottom and occasionally inclined to make quick trips to the surface
• Water depth: Shallow areas
• Sexual dimorphism: Mature females are generally broader and more robust than males
• Bottom structure and flow: Fine sand or light silt, plant debris and low to moderate current

In your aquarium

For successful care of Hoplisoma loretoensis, keep a group of at least six and use smooth, fine sand to protect the barbels. Stable, well-oxygenated water with low waste levels is essential, especially for wild-collected fish. Add plants, roots and shaded areas while leaving open space for foraging. Avoid aggressive or oversized tank mates. Slow acclimation, preventive quarantine and a varied diet will support a strong adjustment and long-term health in captivity.