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Introduction

The Hoplosternum littorale, also known as the Brown Hoplo, is a robust South American catfish valued for its calm personality and broad aquarium tolerance. Its mottled brown body and bony plates give it a prehistoric appearance, while its barbels help it investigate the bottom. This species mainly inhabits slow-moving, shallow waters, often filled with plant debris. It can also breathe atmospheric air, an adaptation useful in warm habitats with limited oxygen. Very uncommon in the aquarium trade, this fish is offered here as a wild-collected species.

General species description

The Hoplosternum littorale is an armored catfish in the family Callichthyidae, within the subfamily Callichthyinae. It is mainly benthic and becomes more active at dusk or during the night. Despite its considerable adult size, it is generally peaceful with similarly sized fish that it cannot swallow. Its behavior includes constant substrate exploration, resting under cover and occasional trips to the surface to gulp air. This species requires a spacious aquarium with a large bottom area. It remains uncommon in aquarium stores, which accounts for its very rare availability in the hobby.

Geographic origin and biotope

The Hoplosternum littorale comes from the tropical lowlands of South America, including coastal basins and wetlands in Guyana and neighboring regions. It inhabits marshes, drainage ditches, temporary ponds, inland lagoons and small streams with a weak current. The water may be clear or strongly stained by organic matter, depending on the season and habitat. The bottom is often composed of mud, fine sand and plant debris. Riparian vegetation provides shade and shelter. In an aquarium, clean, well-filtered, warm water with moderate circulation is more suitable than a highly rocky setup exposed to strong flow.

Precise locality and local name

In Guyana, the Hoplosternum littorale is associated with humid coastal lowlands and the network of canals, marshes and small channels bordering major drainage systems. The local name hassa is commonly associated with this type of armored catfish in Guyanese and Caribbean regions. Its secretive daytime habits often make it difficult to see, while it becomes active near the bottom after dark. For aquarists, this origin means providing cover, subdued lighting and a non-abrasive substrate. Because the available individuals are wild collected, gradual acclimation is especially important.

Appearance and physical characteristics

The Hoplosternum littorale has a stocky, elongated body protected by two rows of bony plates. Its basic color ranges from grayish brown to olive brown, with irregular darker markings that help it blend among leaves and mud. The head is broad, the mouth is inferior and the barbels are well developed. The dorsal and pectoral fins contain strengthened rays and should be handled carefully because they can become caught in a net. The species can reach approximately 24 cm in total length. It also has accessory air breathing, which explains its visits to the surface and its ability to tolerate periods of low oxygen.

General diet

The Hoplosternum littorale is an opportunistic omnivore that searches for food by sifting through the substrate with its barbels. In nature, its diet includes insect larvae, small invertebrates, organic debris, seeds and various plant materials. In an aquarium, it generally accepts sinking catfish tablets, omnivore pellets and frozen foods such as bloodworms or brine shrimp. Food should preferably be offered after the lights have been partly dimmed, when the species becomes more active. A varied diet supports healthy growth and body condition. Overfeeding should be avoided because this excellent bottom feeder can quickly create a high organic load in a closed aquarium.

Essential data

• Name of the original river: Guyana, coastal lowland waterways and wetlands.
• Local name used: Hassa.
• Origin of the scientific name: The genus name is formed from Greek roots; the specific epithet refers to a coastal or shore-associated habitat.
• Etymology of the full name: Hoplosternum approximately means armored chest or armed sternum; littorale means coastal, shore-related or associated with lowland coastal areas.
• Common/vernacular names: Brown Hoplo, hassa, brown armored catfish.
• Family: Callichthyidae.
• Subfamily: Callichthyinae.
• Name pronunciation: op-lo-STERN-um - lit-tor-AH-leh.
• Discovery: Achille Valenciennes, 1840.
• Maximum adult size: About 24 cm.
• Water temperature and pH: 24 to 28 °C; approximately pH 6.0 to 8.0.
• Appearance of the watercourse and surrounding vegetation: Slow water, marshes, canals and small channels; dense vegetation, leaf litter and organic debris.
• Typical tankmates: Peaceful South American tetras, calm small cichlids, hatchetfish, non-aggressive catfish, hardy livebearers and peaceful loricariids.
• Temperament and behavior: Peaceful, mainly crepuscular and nocturnal; searches the bottom and periodically surfaces for air.
• Water depth: Generally shallow to moderate, in calm and obstructed areas.
• Sexual dimorphism: Mature males often have thicker, more strongly developed pectoral fins; females are usually heavier-bodied.
• Bottom structure and flow: Mud, fine sand and plant debris; low to very low current.

In your aquarium

To successfully keep the Hoplosternum littorale, provide a long, tightly covered aquarium with a soft substrate, roots and shelters large enough for an adult. Efficient filtration is essential, but the current should remain moderate. Maintain stable temperature, good water quality and open access to the surface because the species periodically breathes air. Offer a varied sinking diet and remove leftovers to limit waste accumulation. Its calm temperament allows a carefully selected community, but its adult size rules out very small fish. Since this is a very rare wild species, slow acclimation and close observation during the first weeks are recommended.