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Cynoscion leiarchus, commonly known as Pescada-branca or White Weakfish, is a sciaenid fish characterized by its elongated, fusiform body and silvery coloration. It is a commercially important species in many parts of its range, particularly in South America. This species is known for its predatory nature, feeding primarily on smaller fish and crustaceans. It inhabits coastal waters, estuaries, and sometimes penetrates into freshwater systems, demonstrating a degree of euryhalinity. Its flesh is highly valued for its delicate flavor and texture.
Características físicas
- Formato do corpo
- elongated
- Coloração
- Dorsal surface is typically greenish-gray to bluish-gray, fading to a bright silvery white on the flanks and belly. Fins are generally dusky or yellowish, sometimes with darker margins. No distinct spots or bars on the body.
- Tipo de escama
- ctenoid
- Posição da boca
- terminal
- Características distintivas
- Elongated, fusiform body, Large, oblique mouth extending to or beyond the posterior margin of the eye, Two prominent canine-like teeth at the tip of the upper jaw, Absence of barbels on the chin, Lateral line slightly arched anteriorly, then straight to the caudal fin
- Nadadeira dorsal
- Two dorsal fins; the first is spiny (8-11 spines), and the second is soft-rayed (1 spine, 20-24 soft rays). The two fins are distinctly separated.
- Nadadeira caudal
- Caudal fin is typically truncate to slightly emarginate.
- Nadadeira peitoral
- Pectoral fins are relatively long, reaching beyond the tip of the pelvic fins.
- Nadadeiras características
- Anal fin with 2 spines and 10-12 soft rays. Pelvic fins are thoracic.
Dicas de identificação
Body Shape and Coloration
Look for the elongated, silvery body with a darker dorsal side. The lack of distinct spots or bars is a key feature.
Mouth and Teeth
Observe the large, oblique mouth and the two prominent canine teeth in the upper jaw. This distinguishes it from many other sciaenids.
Dorsal Fins
Note the two distinctly separated dorsal fins, with the first being spiny and the second soft-rayed.
Lateral Line
The lateral line is slightly arched over the pectoral fin and then runs straight to the caudal fin.
Habitat
- Tipo de água
- brackish
- Profundidade
- Typically found in shallow coastal waters, estuaries, and river mouths, from surface to about 50 meters (164 feet).
- Ambiente
- Prefers sandy or muddy bottoms in turbid waters. Often associated with mangrove areas and seagrass beds as juveniles. Can tolerate a wide range of salinities.
- Distribuição geográfica
- Western Atlantic Ocean, from the Caribbean Sea along the coast of Central and South America, extending south to southern Brazil. Also found in the Gulf of Mexico.
Informações sobre aquário
- Nível de cuidado: expert
- Temperamento: aggressive
- Alimentação: carnivore
- Tamanho mínimo do aquário: 500 gallons
- Temperatura: 22-28°C (72-82°F)
- Nível de pH: 7.8-8.4
- Dureza da água: 1.020-1.025 SG
- Compatibilidade: Not suitable for community tanks; best kept in species-specific tanks or with very large, robust, and equally aggressive fish.
- Requisitos especiais: Requires a very large tank with excellent filtration due to its size and predatory feeding habits. Needs ample swimming space and a varied diet of fresh or frozen seafood. Not typically kept in home aquariums due to its size and specialized care requirements.
Informações no ambiente natural
- Estado de conservação: least concern
- Sazonalidade: Spawning seasons vary geographically, but generally occurs during warmer months. Fishing pressure can be seasonal, often peaking during non-spawning periods to ensure sustainability.
- Preço de mercado: Varies significantly by region and season, but generally commands a good price due to its culinary appeal.
- Importância comercial: high
- Sabor: Mild, delicate, slightly sweet
- Textura: Flaky, tender, white meat
- Métodos de preparo: Baked, Grilled, Fried, Steamed, Sautéed
- Valor nutricional: Good source of lean protein, omega-3 fatty acids, and various vitamins and minerals.
Fatos principais
Euryhaline Naturebehavior
Cynoscion leiarchus is known for its ability to tolerate a wide range of salinities, allowing it to inhabit both marine coastal waters and brackish estuarine environments, and even venture into freshwater.
Sound Productioninteresting
Like many sciaenids (drum and croaker family), Cynoscion leiarchus can produce drumming sounds using specialized muscles vibrating against its swim bladder, particularly during spawning or territorial displays.
Top Predatorbehavior
As an adult, Pescada-branca is a significant apex predator in its estuarine and coastal habitats, playing a crucial role in controlling populations of smaller fish and crustaceans.
Rapid Growthinteresting
This species exhibits relatively rapid growth, reaching marketable size within a few years, which contributes to its commercial importance.
Informações de segurança
Seguro- Nível de segurança: safe
- Venenoso: Não
- Comestibilidade: edible
- Observações de manuseio: No specific handling precautions are required beyond standard fish handling practices to avoid fin pricks. The teeth are sharp but not venomous.
Espécies similares
Pescada-amarela
Cynoscion acoupa
Cynoscion acoupa typically has a more yellowish coloration, especially on the fins, and often exhibits small, indistinct spots on the upper flanks. Its mouth is generally smaller, and the two canine teeth in the upper jaw are less prominent than in C. leiarchus.
Pescada-olhuda
Cynoscion microlepidotus
Cynoscion microlepidotus has smaller scales and a more slender body. Its coloration can be similar, but C. microlepidotus often has a more pointed snout and a slightly different fin ray count. The eye size relative to the head can also be a distinguishing feature.
Pescada-dentão
Cynoscion guatucupa
Cynoscion guatucupa (Argentine Weakfish) has a more robust body and typically a darker, more bronze-like coloration dorsally. Its geographic range is generally more southerly, though there can be overlap. The number of soft rays in the dorsal and anal fins can also differ.
Classificação científica
- Reino
- Animalia
- Filo
- Chordata
- Classe
- Actinopterygii
- Ordem
- Perciformes
- Família
- Sciaenidae
- Gênero
- Cynoscion
- Espécie
- Cynoscion leiarchus
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