Platystomatichthys sturio

A Little More Information...

The Platystomatichthys sturio, also known as the Zorro Sturio Catfish, is a discreet Amazonian catfish valued for its unusual shape. Native to Peru, it occurs in freshwater habitats of the upper Amazon basin. Its elongated body, flattened head and extended snout give it a distinctive appearance, while its mainly nocturnal habits make it an interesting fish to observe after the aquarium lights go out. This species remains very rare in the aquarium trade. Available specimens are wild collected, so successful keeping depends on stable water, suitable structure and consistent feeding. It is best suited to experienced aquarists who can provide a spacious, carefully maintained aquarium.

General species description

The Platystomatichthys sturio is a bottom-dwelling catfish in the family Pimelodidae, with a body adapted to life close to the substrate. It has a broad head and an elongated snout that vaguely recalls a sturgeon, a feature reflected in its English common name. Its activity is mainly crepuscular and nocturnal, when it explores the bottom in search of food. In an aquarium, provide hiding places, moderate water movement and plenty of open floor space. Despite its unusual appearance, it is not suitable for a small community tank. Its high rarity also makes careful attention to collection origin and acclimation especially important.

Geographical origin and biotope

The Platystomatichthys sturio is associated with Peru and the upper Amazon basin. It inhabits tropical waterways where quiet areas occur alongside sections with stronger flow. The bottom is generally made up of sand, mud and plant debris, with shelter provided by roots, submerged branches and undercut banks. Riparian vegetation contributes shade and organic material to the water. In an aquarium, driftwood, leaf litter and shaded areas reproduce its environment more effectively than intense lighting and an empty layout. Warm, soft to slightly acidic, well-oxygenated water is appropriate for its maintenance.

Precise locality and local name

The known range of the species is in Peru, within the Amazon drainage. The most commonly used aquarium trade name is Zorro Sturio Catfish. “Zorro” refers to the impression of a dark mask around the head, while “Sturio” recalls its sturgeon-like appearance. This vernacular name helps identify it in the trade, but the scientific name remains essential for avoiding confusion with other Amazonian catfish. Availability is occasional, making this a species best suited to experienced aquarists who can properly document its origin and provide a calm, stable environment.

Appearance and physical characteristics

The Platystomatichthys sturio has an elongated body, a flattened head and a distinctly extended snout. As in many Amazonian catfish, its barbels are important sensory structures used to locate food when visibility is poor. Its coloration is generally subdued, ranging from brownish to grayish, with darker markings that provide camouflage over the substrate. Its sensory barbels and head shape are among its most distinctive features. The pectoral and dorsal fins have spines that can cause injury during handling, so use an appropriate net. Adults may reach about 25 cm, requiring a spacious aquarium with ample bottom area.

General diet

The Platystomatichthys sturio is an opportunistic predator and bottom-feeding hunter. In nature, it likely takes small aquatic animals, invertebrates and other available prey from the substrate. In aquaria, it accepts quality sinking pellets, carnivorous catfish tablets and frozen foods such as bloodworms, brine shrimp or small pieces of shrimp. Feeding after the lights have been dimmed is often effective because activity increases at that time. Portions should remain moderate so uneaten food does not accumulate in the substrate. A varied diet offered regularly supports the acclimation of wild specimens and reduces competition with faster-moving tank mates.

Essential data

• Name of native river: upper Amazon basin of Peru
• Local name used: Zorro Sturio Catfish
• Origin of the scientific name: Platystomatichthys is a Greek-based genus name formed from platys, broad, stoma, mouth, and ichthys, fish; sturio is a Latin term associated with the sturgeon.
• Full-name etymology: Platystomatichthys means “broad-mouthed fish”; sturio means “sturgeon” or refers to a resemblance to one.
• Common/vernacular names: Zorro Sturio Catfish
• Family: Pimelodidae
• Subfamily: Pimelodinae
• Name pronunciation: plat-ee-stoh-MAT-ihk-this - STUR-ee-oh
• Discovery: Rudolf Kner, 1858
• Maximum adult size: about 25 cm
• Water temperature and pH: 24 to 28 °C; pH 6.0 to 7.5
• Waterway appearance and surrounding vegetation: tropical Amazonian waterways, shaded banks, roots and submerged plant debris
• Typical tank mates: Pimelodus pictus, Oxydoras niger, Geophagus altifrons, Brochis splendens, Hemigrammus rhodostomus
• Temperament and behavior: generally discreet, bottom-oriented and mainly nocturnal; an opportunistic predator of very small fish
• Water depth: areas close to the bottom
• Sexual dimorphism: difficult to distinguish visually in aquarium specimens
• Bottom structure and flow: sand, mud, woody debris and low to moderate flow with good oxygenation

In your aquarium

To keep the Platystomatichthys sturio successfully, use a long, tightly covered aquarium with non-abrasive substrate, driftwood and shaded shelters. Maintain warm, stable water, remove uneaten food and acclimate wild specimens slowly. Avoid tiny or overly aggressive tank mates and provide effective filtration without excessive current. Because the species is very rare, every individual deserves careful maintenance and traceable collection information. Quiet evening observation is the best way to appreciate its natural behavior.