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Pseudopimelodus mangurus, also known as Rio Lajeado, is a Brazilian freshwater catfish belonging to the family Pseudopimelodidae. This rare aquarium species is recognized by its robust body, broad head, and mainly nocturnal habits. It lives close to the bottom of waterways, searching for food among stones, gravel, and organic debris. The specimens offered are collected from the wild. With a rarity rating of 3 — very rare, successful care requires a carefully prepared aquarium, stable water conditions, and a diet suited to a predatory catfish.

General description

Pseudopimelodus mangurus is a South American catfish in the family Pseudopimelodidae, known for its stocky body and large forward-facing mouth. It mainly inhabits lower sections of rivers and usually remains discreet during daylight hours. Activity increases at dusk, when it explores the substrate in search of prey. The species is associated with Brazil and the locality known as Rio Lajeado. In an aquarium, it should be treated as a bottom-dwelling fish with predatory tendencies: small fish and invertebrates small enough to swallow may become prey. Its limited availability makes it especially sought after by specialized aquarists. This offering is exclusive to Ton.Fish in Canada.

Geographic origin and biotope

The local name Rio Lajeado links this population to a Brazilian freshwater waterway with a structured bottom and areas providing shelter. This type of habitat suits a catfish that stays close to the substrate and uses spaces between rocks, wood piles, and shaded banks. An aquarium biotope should therefore include subdued lighting, several hiding places, and regular water movement without creating an excessively strong current. A temperature of 22 to 28 °C and a pH around 6.0 to 7.5 are practical maintenance guidelines, with stability being more important than rapid changes.

Precise locality and local name

The local name provided for this form is Rio Lajeado, an appellation commonly used in the aquarium trade to identify its geographic origin. The reference country is Brazil. Because of its rarity, it is best to preserve the locality name with each specimen and avoid mixing fish from different collections. This traceability is useful to specialized aquarists and helps preserve the geographic identity of wild populations.

Appearance and physical characteristics

Pseudopimelodus mangurus has the typical appearance of a predatory catfish: a thick body, broad head, large mouth, and well-developed sensory barbels. Its overall coloration is subdued and suited to life over a dark or stony bottom, with tones that may vary according to lighting, age, and stress. The pectoral and dorsal fins have hardened rays and should be handled carefully during transfers. Its robust appearance and proportionally large head are its most distinctive features. Adults may reach approximately 30 cm, requiring a spacious aquarium with an open bottom area and sturdy shelters.

General diet

This species is mainly carnivorous and opportunistic. In the wild, its diet likely includes small fish, crustaceans, aquatic insects, and other benthic organisms that are available. In captivity, it accepts quality sinking meaty foods, including pieces of fish, shrimp, mussel, or pellets made for predatory fish. Food is best offered as the lighting fades, when its nocturnal behavior becomes more pronounced. Overfeeding should be avoided, leftovers should be removed, and growth should be monitored because excess food quickly harms water quality. Tank mates must be selected carefully: any fish small enough to fit in its mouth may be eaten.

Essential data

• Name of original river: Rio Lajeado
• Local name used: Rio Lajeado
• Origin of the scientific name: Pseudopimelodus is the genus name; mangurus is the specific epithet.
• Etymology of the full name: Pseudopimelodus approximately means “false Pimelodus”; the precise etymology of mangurus is not included.
• Common/vernacular names: Rio Lajeado
• Family: Pseudopimelodidae
• Subfamily: Pseudopimelodinae
• Pronunciation: soo-doe-pie-MEL-oh-dus - man-GOO-rus
• Discovery: information not included.
• Maximum adult size: approximately 30 cm
• Water temperature and pH: 22 to 28 °C; pH 6.0 to 7.5
• Waterway appearance and surrounding vegetation: freshwater habitat with stones, gravel, and wood; riparian vegetation providing shade.
• Typical tank mates: robust South American fish of comparable size, large adult characids, non-territorial loricariids, and other peaceful bottom fish.
• Temperament and behavior: discreet, nocturnal, opportunistic predator, and generally solitary.
• Water depth: bottom zones and sheltered sections of the waterway.
• Sexual dimorphism: external differences are not obvious in aquarium specimens.
• Bottom structure and flow: gravel, stones, and wood; regular to moderate flow with shelters and calm areas.

In your aquarium

Success with Pseudopimelodus mangurus depends on a spacious, covered aquarium arranged with shelters that cannot collapse. Use a smooth substrate, efficient filtration, and stable water conditions. Feed it after the lights gradually go out, using meaty foods appropriate for its size. Avoid small fish and monitor interactions because this predator may swallow them. Since it is a very rare species and is collected from the wild, gentle acclimation, quarantine, and careful preservation of the Rio Lajeado locality are especially important.