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The Pirarara, or Redtail Catfish, is a large, striking freshwater catfish native to the Amazon and Orinoco river basins. It is renowned for its distinctive coloration, particularly the vibrant red-orange caudal fin, and its impressive size. This species is a solitary, nocturnal predator that plays a significant role in its ecosystem as an apex predator. Due to its size and predatory nature, it is a popular sport fish and a highly sought-after, albeit challenging, aquarium species for experienced enthusiasts.
Características físicas
- Formato do corpo
- elongated
- Coloração
- Distinctive tri-color pattern. The dorsal surface is dark brown to black, transitioning to a white or cream-colored belly. The most striking feature is the bright red-orange caudal (tail) fin, which gives it its common name. Juveniles may have more pronounced black spots on the body.
- Tipo de escama
- none
- Posição da boca
- terminal
- Características distintivas
- Large, broad, and flattened head, giving it a 'phractocephalus' (meaning 'helmet head') appearance., Three pairs of barbels: one long pair on the maxilla (upper jaw) extending past the pectoral fins, and two shorter pairs on the chin., Adipose fin present, typical of catfishes., Large, wide mouth., Absence of scales.
- Nadadeira dorsal
- Single, relatively small dorsal fin with a strong, serrated spine.
- Nadadeira caudal
- Large, deeply forked caudal fin, typically bright red-orange.
- Nadadeira peitoral
- Large, powerful pectoral fins, each with a strong, serrated spine.
- Nadadeiras características
- The vibrant red-orange caudal fin is the most distinguishing fin characteristic.
Dicas de identificação
Coloration
Look for the unmistakable tri-color pattern: dark back, white belly, and bright red-orange tail fin. This is the most reliable visual identifier.
Head Shape
The broad, flattened, and somewhat 'helmet-like' head is characteristic of the genus Phractocephalus.
Barbels
Observe the three pairs of barbels, especially the very long maxillary barbels that extend well beyond the pectoral fins.
Size
Adults are very large, reaching up to 1.8 meters (6 feet) in length and over 80 kg (176 lbs) in weight, making them one of the largest freshwater catfishes.
Habitat
- Tipo de água
- freshwater
- Profundidade
- Prefers deeper channels of large rivers, but also inhabits flooded forests and lakes during high water periods. Juveniles may be found in shallower, more vegetated areas.
- Ambiente
- Large rivers, tributaries, flooded forests (várzea), and lakes within the Amazon and Orinoco basins. They prefer areas with submerged structures like fallen trees, root systems, and rocky outcrops for ambush points and shelter.
- Distribuição geográfica
- Native to the Amazon and Orinoco River basins in South America, including countries such as Brazil, Peru, Ecuador, Colombia, Venezuela, Bolivia, and Guyana.
Informações sobre aquário
- Nível de cuidado: expert
- Temperamento: aggressive
- Alimentação: carnivore
- Tamanho mínimo do aquário: 2000 gallons (7570 liters) for a single adult specimen, ideally much larger (pond-sized)
- Temperatura: 72-82°F (22-28°C)
- Nível de pH: 6.0-7.5
- Dureza da água: 2-15 dGH
- Compatibilidade: Only compatible with other very large, robust fish that cannot be swallowed. Best kept as a solitary specimen due to its predatory nature and immense size.
- Requisitos especiais: Requires an extremely large aquarium or pond with powerful filtration to handle the significant bioload. Substrate should be fine sand or smooth gravel to protect its delicate barbels. Provide large, smooth hiding spots (e.g., PVC pipes, large driftwood) and ensure the tank is securely covered as they are powerful jumpers. Feeding should consist of high-quality, varied carnivorous foods, avoiding feeder fish due to disease risk. Regular, large water changes are essential.
Informações no ambiente natural
- Estado de conservação: least concern
- Sazonalidade: Spawning typically occurs during the rainy season (December to March in the Amazon), when water levels rise and flood forest areas, providing abundant food and cover for fry. Fishing activity may increase during dry seasons when fish are concentrated in main river channels.
- Preço de mercado: Variable, but juveniles can be moderately priced for the aquarium trade; adults are rarely sold due to size. As a food fish, it commands a good price in local markets.
- Importância comercial: medium
- Sabor: Mild, firm, and white flesh.
- Textura: Firm, flaky, and non-oily.
- Métodos de preparo: Grilled, Fried, Baked, Stewed
- Valor nutricional: Good source of protein and omega-3 fatty acids.
Fatos principais
Apex Predatorbehavior
The Pirarara is one of the top predators in its native Amazonian and Orinoco river systems, feeding on a variety of fish, crustaceans, and even fallen fruits.
Rapid Growthinteresting
Juvenile Pirarara grow incredibly fast, often outgrowing typical home aquariums within a year or two, making them unsuitable for most hobbyists.
Long-Livedinteresting
In optimal conditions, Pirarara can live for 15-20 years or more, a significant commitment for any aquarist.
Cultural Significanceinteresting
In some indigenous cultures of the Amazon, large catfishes like the Pirarara hold cultural and spiritual significance, often featuring in folklore and traditions.
Unique Barbel Structurebehavior
The Pirarara's long maxillary barbels are highly sensitive chemosensory organs, crucial for detecting prey in the murky waters of its habitat.
Informações de segurança
Manusear com cuidado- Nível de segurança: caution
- Venenoso: Não
- Comestibilidade: edible
- Observações de manuseio: Pirarara possess strong, serrated spines in their dorsal and pectoral fins. These spines can inflict painful wounds if not handled carefully. While not venomous, the wounds can become infected. Due to their immense size and power, large specimens can cause significant injury during handling. Always use thick gloves and exercise extreme caution when handling, especially during fishing or transport. Their powerful jaws can also deliver a strong bite.
Espécies similares
Piraíba
Brachyplatystoma filamentosum
While also a very large Amazonian catfish, the Piraíba typically has a more silvery-grey body coloration, a more elongated and slender body profile, and a less pronounced red tail. Its head is also less broad and flattened than the Pirarara's. Piraíba also has longer, more filamentous dorsal and caudal fin rays in juveniles.
Jau
Zungaro zungaro
The Jau has a mottled or spotted brown/yellowish coloration, a more robust and less elongated body, and a rounded or slightly emarginate caudal fin that is not red. Its head is also less flattened and broad.
Classificação científica
- Reino
- Animalia
- Filo
- Chordata
- Classe
- Actinopterygii
- Ordem
- Siluriformes
- Família
- Pimelodidae
- Gênero
- Phractocephalus
- Espécie
- Phractocephalus hemioliopterus
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