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Introduction

Hoplisoma tukano, also known as Corydoras tukano, is a small South American catfish from the family Callichthyidae. It originates from the Rio Tiquié in northwestern Brazil and is associated with calm, shaded waters in the Rio Negro basin. Its compact body, bony plates and attractive contrasting pattern make it appealing to aquarists who enjoy peaceful, natural-looking bottom fish. This species remains uncommon in the trade, and the specimens offered here are collected from the wild, so careful acclimation and consistently clean water are important. A mature aquarium, fine substrate and a small group provide the best setting for observing its natural behavior.

General species description

Hoplisoma tukano is a small, peaceful, schooling bottom fish that spends much of its time searching the substrate with its barbels. Like other members of the Callichthyidae, it has rows of bony plates and can supplement its breathing by taking air at the surface. It should be kept in a group in a mature aquarium with open areas and sheltered spots. Its behavior is usually discreet, but it becomes much more active and interesting to watch once it feels secure. This is an uncommon species valued for its restricted geographic origin and its characteristic appearance among Rio Negro corydoras. Wild-collected individuals should be acclimated gradually, with particular attention given to water quality and feeding during the first days after arrival.

Geographic origin and biotope

The species comes from Brazil, in the upper Rio Negro basin, specifically the Rio Tiquié. This Amazonian drainage is associated with soft, acidic water often tinted by dissolved organic matter. The habitat includes shallow areas, forested margins and bottoms made of sand or decomposing leaves. Gentle filtration, subdued lighting and a layout with roots are therefore especially suitable. In an aquarium, stable conditions matter more than extreme values: sudden changes in pH, temperature or conductivity should be avoided. Wild-collected fish may appear more reserved during the first days after arrival. Regular maintenance, careful observation and a gradual adjustment to prepared foods help reduce stress and support a successful transition to aquarium life.

Specific location and local name

The reference locality is the Rio Tiquié, a tributary of the Rio Uaupés, which belongs to the Rio Negro basin in Brazil. The name tukano refers to the Indigenous Tukano peoples of this part of the Amazon. In the aquarium trade, the species is commonly called Tukano cory or Corydoras tukano, and its former combination is still widely used. Common names are not completely standardized among countries and suppliers. This restricted origin helps explain why Hoplisoma tukano is considered an uncommon aquarium fish. For wild-collected specimens, slow acclimation and a quiet environment help reduce transport-related stress and encourage normal feeding and schooling behavior.

Appearance and physical characteristics

Hoplisoma tukano has the compact, slightly flattened body typical of small corydoras and is protected by bony plates. Its coloration consists of a pale to grayish background with contrasting dark markings on the head and body. The fins are translucent to lightly pigmented, while the barbels around the mouth help it locate food in the substrate. The spines of the pectoral and dorsal fins can lock into position, so coarse nets and narrow containers should be avoided during handling. Its modest size and peaceful temperament suit carefully planned community aquariums. A fine sand substrate helps protect the barbels and allows the fish to express its natural sifting behavior without constant abrasion or injury.

General diet

In nature, Hoplisoma tukano searches for small invertebrates, larvae and other edible particles in the bottom sediments. In the aquarium, it accepts quality sinking tablets, bottom-feeder pellets and frozen foods such as bloodworms or brine shrimp. A varied diet supports condition, especially in recently imported wild fish. It should not be treated as an algae eater or expected to survive only on leftovers from other fish. Feeding when the lights are dim can make it easier for the group to reach its food. Portions should be small enough to be eaten promptly, since organic waste accumulating in the substrate can damage water quality. Regular, varied feeding is important for maintaining healthy barbels, good body condition and natural foraging behavior.

Essential data

• River of origin Rio Tiquié.
• Local name used Tukano cory.
• Origin of the scientific name Hoplisoma is the genus name; tukano refers to the Tukano peoples of the Amazon region.
• Etymology of the full name Hoplisoma approximately means “armed body” or “protected body,” referring to the bony plates; tukano is a regional ethnonym.
• Common/vernacular names Tukano cory; Corydoras tukano.
• Family Callichthyidae.
• Subfamily Corydoradinae.
• Pronunciation hop-li-SO-ma too-KA-no.
• Discovery Rodrigo Queiroz de Britto and Roberto Esser dos Reis, 2005.
• Maximum adult size About 4 cm.
• Water temperature and pH About 23 to 27 °C; acidic to slightly acidic water, generally around pH 5.5 to 7.
• Stream appearance and surrounding vegetation Shaded, soft and acidic Amazonian water with leaves, roots and forest vegetation along the margins.
• Typical tankmates Small Amazonian characins, pencilfish, peaceful dwarf cichlids and other similarly sized corydoras.
• Temperament and behavior Peaceful, social and active on the bottom; it benefits from group maintenance.
• Water depth Shallow areas and calm margins.
• Sexual dimorphism Mature females are generally broader and more robust than males when viewed from above.
• Bottom structure and flow Fine sand, plant debris and low to moderate current.

In your aquarium

For success with Hoplisoma tukano, provide a mature, peaceful and well-oxygenated aquarium with a fine substrate, roots and shaded areas. Keep the fish in a group and offer varied sinking foods without allowing larger tankmates to monopolize meals. Wild-collected specimens benefit from gradual acclimation and consistently stable conditions. Soft, slightly acidic water, regular water changes and filtration without excessive current will support long-term health. Because this species is uncommon in the trade, every acquisition should be planned carefully so the fish can receive conditions suited to its Amazonian origin. Gentle handling is also important because of its locking fin spines.