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Brachyplatystoma filamentosum, commonly known as Piraíba, is one of the largest freshwater fish in South America and a prominent member of the Pimelodidae family. It is characterized by its massive size, elongated body, and distinctive filamentous extensions on its caudal fin lobes, particularly in juveniles. This apex predator plays a crucial ecological role in the Amazon and Orinoco river basins.
Características físicas
- Formato do corpo
- elongated
- Coloração
- Adults typically exhibit a dark grey to brownish-grey dorsal surface, fading to a lighter grey or whitish belly. Juveniles often have distinct dark spots or blotches on their flanks, which tend to fade with age. The fins are generally dark.
- Tipo de escama
- none
- Posição da boca
- terminal
- Características distintivas
- Massive size, reaching up to 3.6 meters (12 feet) in length and over 200 kg (440 lbs) in weight., Long, flattened head with a wide mouth., Three pairs of barbels: one maxillary pair extending beyond the pectoral fins, and two pairs of mental barbels., Highly elongated, filamentous extensions on the upper and lower lobes of the caudal fin, especially prominent in juveniles and sub-adults, which shorten with age., Adipose fin is relatively large.
- Nadadeira dorsal
- Single, relatively short-based dorsal fin with a strong, serrated spine and soft rays.
- Nadadeira caudal
- Deeply forked caudal fin with highly elongated, filamentous extensions on both lobes, particularly in younger individuals.
- Nadadeira peitoral
- Large, powerful pectoral fins, each with a strong, serrated spine.
- Nadadeiras características
- Pelvic fins are relatively small. Adipose fin is well-developed.
Dicas de identificação
Size
Its immense size (often exceeding 2 meters) immediately distinguishes it from most other freshwater fish.
Caudal Fin Filaments
The long, whip-like extensions on the caudal fin lobes are a key identifier, especially in juveniles and sub-adults. These are much longer than in other Brachyplatystoma species.
Head Shape and Barbels
The broad, flattened head and very long maxillary barbels (extending past the pectoral fins) are characteristic.
Coloration (Juveniles vs. Adults)
Juveniles often have distinct spots or blotches, which fade in adults, becoming more uniformly dark grey dorsally.
Habitat
- Tipo de água
- freshwater
- Profundidade
- Primarily found in deep channels of large rivers, but juveniles may inhabit shallower areas and flooded forests.
- Ambiente
- Large, turbid rivers and their major tributaries, including main river channels, deep pools, and occasionally flooded forest areas during high water. Prefers areas with strong currents and abundant prey.
- Distribuição geográfica
- Amazon and Orinoco River basins in South America, including countries such as Brazil, Peru, Ecuador, Colombia, Venezuela, and Bolivia.
Informações sobre aquário
- Nível de cuidado: expert
- Temperamento: aggressive
- Alimentação: carnivore
- Tamanho mínimo do aquário: Not suitable for home aquariums due to immense size; requires public aquaria or very large, specialized facilities (thousands of gallons).
- Temperatura: 24-28°C (75-82°F)
- Nível de pH: 6.0-7.5
- Dureza da água: 2-15 dGH
- Compatibilidade: Only with other very large, robust fish that cannot be swallowed. Best kept alone or in species-specific exhibits.
- Requisitos especiais: Requires extremely large, well-filtered tanks with strong water flow. Substrate should be fine sand to prevent injury to barbels. Dim lighting and ample hiding spots (large logs, rocks) are beneficial. Requires a highly proteinaceous diet of large prey items.
Informações no ambiente natural
- Estado de conservação: least concern
- Sazonalidade: Spawning migrations typically occur during the high-water season, with adults moving upstream to spawn and juveniles drifting downstream. Fishing pressure can vary seasonally.
- Preço de mercado: Variable, but generally high for food fish in local markets; live specimens for public aquaria command very high prices.
- Importância comercial: high
- Sabor: Mild, firm, white flesh.
- Textura: Firm, flaky.
- Métodos de preparo: Grilled, Fried, Baked, Stewed
- Valor nutricional: Good source of protein and omega-3 fatty acids.
Fatos principais
Amazon's Giantrecord
The Piraíba is one of the largest, if not the largest, true freshwater fish in South America, capable of reaching lengths comparable to small sharks.
Long-Distance Migratorbehavior
This species undertakes extensive spawning migrations, traveling thousands of kilometers upstream to reproduce, a testament to the connectivity of the Amazonian river system.
Apex Predatorbehavior
As an apex predator, the Piraíba plays a vital role in regulating fish populations within its ecosystem, feeding on a wide variety of smaller fish and even terrestrial animals that fall into the water.
Filamentous Juvenilesinteresting
The extremely long, whip-like filaments on the caudal fin of juvenile Piraíba are thought to mimic drifting plant debris, providing camouflage from predators.
Taxonomic Stabilityevolution
While some Brachyplatystoma species have undergone taxonomic revisions, B. filamentosum has remained relatively stable, recognized by its distinct morphological features.
Informações de segurança
Manusear com cuidado- Nível de segurança: caution
- Venenoso: Não
- Comestibilidade: edible
- Observações de manuseio: Due to its immense size and powerful musculature, handling a Piraíba requires extreme caution. Large specimens can inflict serious injury with their thrashing tails or by biting. The pectoral and dorsal fin spines are strong and can cause deep punctures. Always use appropriate heavy-duty gear and exercise caution when landing or releasing. Not venomous, but wounds can become infected.
Espécies similares
Dourada
Brachyplatystoma rousseauxii
B. rousseauxii typically has a more silvery-golden coloration, especially when fresh, and its caudal fin filaments are generally shorter and less pronounced than those of B. filamentosum. The head shape can also be slightly different, with B. rousseauxii often appearing more streamlined.
Pirarara
Phractocephalus hemioliopterus
The Pirarara has a distinct red-orange caudal fin and adipose fin, a broad, flattened head, and a dark body with a white belly. It lacks the elongated caudal fin filaments of B. filamentosum and has a very different color pattern.
Jau
Zungaro zungaro
The Jau has a more mottled, cryptic coloration (often yellowish-brown with dark spots/blotches) and a more robust, less elongated body shape. Its caudal fin is not deeply forked and lacks the filamentous extensions seen in B. filamentosum.
Classificação científica
- Reino
- Animalia
- Filo
- Chordata
- Classe
- Actinopterygii
- Ordem
- Siluriformes
- Família
- Pimelodidae
- Gênero
- Brachyplatystoma
- Espécie
- filamentosum
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