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Hydrolycus tatauaia, also known as Red Tail Payara, is a spectacular South American predator from the family Cynodontidae. Its elongated body, projecting lower jaw, and impressive canine teeth make it one of the most recognizable fish from the large rivers of the Amazon basin. This species remains very rare in the aquarium trade and is best suited to experienced aquarists able to provide a very large aquarium. The specimens offered here are wild collected and are available exclusively through Ton.Fish in Canada, making them an especially desirable choice for a specialized predator aquarium.

General species description

Hydrolycus tatauaia is a predatory characiform in the genus Hydrolycus, adapted to hunting in open water in South American rivers. Like other payaras, it has a deeply cleft mouth and two long canine teeth that fit into cavities in the upper jaw. Its streamlined body allows rapid acceleration, while the powerful caudal fin supports high-speed pursuits in flowing water. The species is usually kept alone or with robust fish of similar size, since its hunting behavior makes small tankmates vulnerable. Its red to reddish-orange tail is its main visual feature. As a very rare aquarium fish, it requires careful planning before purchase, particularly regarding tank length, filtration, oxygenation, and adult size.

Geographic origin and biotope

This species comes from the rio Madeira basin in the Amazon region, chiefly in Brazil and in Bolivian areas connected to the same basin. It inhabits large channels, current-swept areas, and rocky sections where water movement remains strong. The habitat is generally warm and well oxygenated, with suspended material increasing during flood periods. Amazonian banks may include flooded forests, submerged branches, and dense marginal vegetation, but the fish mainly hunts in open sections of the channel. In captivity, an open layout, excellent oxygenation, and moderate to strong water movement are appropriate, without turning the entire aquarium into an unmanageable torrent.

Precise location and local name

The geographic reference most closely associated with Hydrolycus tatauaia is the rio Madeira and its drainage system. The common name Red Tail Payara is widely used in the international aquarium trade; other English names include red-tailed payara and vampire tetra, although the latter may also be applied to other predatory characiforms. The term payara is used for several species in the genus Hydrolycus. Among aquarists, the caudal coloration is often used to distinguish this species from payaras with more uniformly silver fins. Its limited availability and wild origin make careful identification important before sale or introduction into an aquarium containing other large predators.

Appearance and physical characteristics

The body of Hydrolycus tatauaia is elongated, streamlined, and covered with silver scales that reflect light strongly. The head is broad at the front, with a projecting lower jaw and enlarged canine teeth that may remain visible even when the mouth is closed. The caudal fin is red, brick-colored, or reddish orange, while the other fins may show gray to reddish tones. Relatively large eyes support visually guided hunting. Its adult size and body shape call for a long aquarium rather than one that is merely tall. Handling must be done carefully because the teeth can cause injuries. Clear, well-filtered, strongly oxygenated water helps maintain overall condition and color intensity.

General diet

Hydrolycus tatauaia is a strictly carnivorous predator that mainly captures small fish and other aquatic prey of suitable size. In captivity, uncontrolled feeder fish should be avoided because of parasite and nutritional risks. A varied diet based on feeder fish from reliable sources, shrimp, mussels, and suitable pieces of marine flesh can be used with moderation. Food items must match the width of the fish’s mouth and should be offered in reasonable portions. Young specimens may be fed more frequently, while adults benefit from a spaced feeding schedule that reduces obesity and water pollution. Monitor feeding closely, since stress, unsuitable current, or overly competitive tankmates can reduce appetite.

Essential data

• River of origin: Rio Madeira
• Local name used: Payara; Red Tail Payara
• Origin of the scientific name: Hydrolycus comes from Greek roots associated with water and wolf; tatauaia is an indigenous term used as the specific epithet.
• Etymology of the full name: Hydrolycus can be understood approximately as water wolf; tatauaia is an indigenous term associated with the species name.
• Common/vernacular names: Red Tail Payara; red-tailed payara; vampire tetra
• Family: Cynodontidae
• Subfamily: Cynodontinae
• Pronunciation: hy-dro-LY-kus ta-ta-WAI-ah
• Discovery: Flávia A. Toledo-Piza, Naércio A. Menezes, and Geraldo Mendes dos Santos, 1999
• Maximum adult size: About 30 cm
• Water temperature and pH: 24 to 29 °C; pH 5.5 to 7.0
• Appearance of the watercourse and surrounding vegetation: Large Amazonian channels with sustained flow, banks bordered by flooded forest and marginal vegetation.
• Typical tankmates: Hydrolycus scomberoides, Hydrolycus armatus, Cichla temensis, Phractocephalus hemioliopterus
• Temperament and behavior: Fast-moving predator, territorial around hunting areas, and generally unsafe with small fish.
• Water depth: Channels and open-water areas
• Sexual dimorphism: No reliable external feature commonly used in aquarium keeping.
• Bottom structure and flow: Mainly rocky or sandy bottom, moderate to fast current, and strongly oxygenated water.

In your aquarium

Success with Hydrolycus tatauaia starts with a very spacious, long, securely covered aquarium equipped with oversized filtration and excellent oxygenation. Because this is a rare wild fish, each specimen deserves a calm acclimation and close observation during the first weeks. Avoid small fish, sharp decorations, and overly fatty meals. Stable water, unobstructed swimming space, and tankmates of comparable size are the most important factors for keeping this predator healthy.