Hoplisoma habrosus

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Hoplisoma habrosus, also known as Corydoras habrosus, is a small South American catfish valued for its tiny size and schooling behavior. Native to the Orinoco basin, it inhabits quiet, shallow areas where it searches the bottom for food. Its speckled pattern, reminiscent of salt and pepper, gives it a subtle but attractive appearance. Peaceful and active in groups, it suits well-planned community aquariums. This wild-collected species has an intermediate availability in the aquarium trade, making it a sought-after small Corydoras for aquarists who enjoy compact South American fish communities.

General species description

Hoplisoma habrosus belongs to the family Callichthyidae, a group of catfish protected by two rows of bony plates. It is currently placed in the genus Hoplisoma, although the name Corydoras habrosus remains widely used in the aquarium trade. This is a peaceful, schooling and very small bottom-dweller that behaves more naturally in a group than when kept alone. A mature aquarium with open bottom space and several shelters encourages normal activity. Its availability is intermediate: it is less consistently found in stores than very common species, but it remains regularly sought after by keepers of small South American aquariums.

Geographic origin and biotope

The reference country is Venezuela, within the Orinoco basin. The type locality is the Río Pao, near El Pao, in Cojedes State. Hoplisoma habrosus inhabits quiet margins and shallow areas where the bottom consists of fine sand, mud or plant debris. The current is generally weak to moderate. Riparian vegetation and aquatic plants provide shade and useful cover. In the aquarium, a soft substrate, moderate lighting and filtration without excessive current better reflect this type of habitat.

Precise locality and local name

The type locality of Hoplisoma habrosus is the Río Pao near El Pao, Venezuela. In the aquarium trade, it is mainly sold as the Dwarf Salt-and-Pepper Cory, Corydoras habrosus or Corydoras nain poivre et sel. These names describe its very small size and speckled pattern rather than traditional vernacular names used by local communities. Its natural range is associated with the Orinoco basin and shallow freshwater habitats. For aquarists, this origin suggests keeping it with calm species in stable, clean and well-oxygenated water.

Appearance and physical characteristics

Hoplisoma habrosus has a stocky body, a slightly flattened underside and a covering of bony plates. The base color ranges from beige gray to silver, with irregular dark markings and a subtle lateral stripe. Its head bears sensitive barbels used to explore the substrate. The fins are usually translucent and may show small spots. Its maximum size is about 3.5 cm, placing it among the smallest members of the group. Like other Corydoradinae, it can also quickly rise to the surface to gulp atmospheric air through its auxiliary intestinal respiration.

General diet

Hoplisoma habrosus is a small omnivorous forager that naturally consumes larvae, tiny invertebrates, benthic organisms and organic debris. In aquariums, it accepts quality sinking tablets, micro-pellets and frozen foods such as bloodworms or brine shrimp. A varied diet supports condition and coloration. Food should be offered in fine portions so every fish can eat, since midwater tank mates may reach it first. Food must reach the bottom without accumulating in the substrate. Live or frozen foods are especially useful for encouraging activity and natural foraging behavior.

Essential data

• River of origin: Río Pao
• Local name used: Dwarf Salt-and-Pepper Cory; Corydoras habrosus
• Origin of the scientific name: Hoplisoma is the current genus; habrosus is the specific epithet
• Complete-name etymology: Hoplisoma approximately means armed body or armored body; habrosus means delicate, graceful or elegant
• Common/vernacular names: Dwarf Salt-and-Pepper Cory; Corydoras nain poivre et sel
• Family: Callichthyidae
• Subfamily: Corydoradinae
• Name pronunciation: hop-lih-SOH-ma ha-BROH-sus
• Discovery: Stanley H. Weitzman, 1960
• Maximum adult size: About 3.5 cm
• Water temperature and pH: About 22 to 26 °C; pH 6.0 to 7.5
• Stream appearance and surrounding vegetation: Quiet, shallow water with fine substrate, plant debris and riparian vegetation
• Typical tank mates: Small peaceful characins, small midwater fish, other peaceful Corydoradinae, robust shrimp and freshwater snails
• Temperament and behavior: Peaceful, schooling, active on the bottom and generally more confident in a group
• Water depth: Shallow areas and margins
• Sexual dimorphism: Females are generally broader and more robust; males are often smaller and slimmer
• Bottom structure and flow: Fine sand or mud, organic debris, weak to moderate flow

In your aquarium

To keep Hoplisoma habrosus successfully, provide a mature aquarium with a fine, non-abrasive substrate, shelters and gentle filtration. Keep it in a group to encourage natural movements and interactions. Stable, clean and well-oxygenated water is essential, along with regularly offered sinking foods. Avoid boisterous fish or tank mates large enough to intimidate it. Since this species is wild-collected, acclimation and quarantine deserve particular attention. With these precautions, this small Corydoras can become an active and engaging inhabitant of the aquarium foreground.