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Thunnus albacares, commonly known as the Yellowfin Tuna, is a species of tuna found in pelagic waters of tropical and subtropical oceans worldwide. It is a large, fast-swimming predatory fish, highly prized in commercial and recreational fisheries. Its name derives from the bright yellow coloration of its dorsal and anal fins and finlets.
Características físicas
- Formato do corpo
- torpedo
- Coloração
- Dark metallic blue to black on the back, fading to silver on the belly. A distinctive golden-yellow stripe often runs along the side. The dorsal and anal fins, as well as the finlets, are bright yellow, giving the species its common name.
- Tipo de escama
- cycloid
- Posição da boca
- terminal
- Características distintivas
- Long, sickle-shaped second dorsal and anal fins in larger adults, which can extend almost to the tail., Numerous small, bright yellow finlets (8-10 dorsal, 7-10 ventral) between the second dorsal/anal fins and the caudal fin., A prominent golden-yellow stripe along the flank, particularly noticeable in fresh specimens., Relatively small eyes compared to body size.
- Nadadeira dorsal
- Two dorsal fins; the first is spiny and relatively short, the second is soft-rayed and much taller, becoming elongated and sickle-shaped in larger adults. Followed by 8-10 yellow finlets.
- Nadadeira caudal
- Deeply forked (lunate) caudal fin, characteristic of fast-swimming pelagic fish.
- Nadadeira peitoral
- Moderately long, extending beyond the origin of the first dorsal fin but not reaching the second dorsal fin origin (a key differentiator from Albacore Tuna).
- Nadadeiras características
- The elongated second dorsal and anal fins in mature individuals are highly distinctive, often reaching up to 20% or more of the body length.
Dicas de identificação
Fin Coloration
Look for the bright yellow second dorsal fin, anal fin, and finlets. This is the most obvious distinguishing feature.
Fin Length (Adults)
In larger specimens, the second dorsal and anal fins are notably elongated and sickle-shaped, sometimes reaching almost to the caudal fin.
Pectoral Fin Length
The pectoral fin is moderately long, extending past the origin of the first dorsal fin but not reaching the origin of the second dorsal fin. This helps differentiate it from Albacore Tuna (Thunnus alalunga) which has much longer pectorals.
Body Stripe
A golden-yellow stripe often runs along the side of the body, particularly visible in fresh catches.
Vent
The vent (anus) is round, not oval or teardrop-shaped, which can be a subtle but useful diagnostic feature.
Habitat
- Tipo de água
- saltwater
- Profundidade
- Primarily epipelagic and mesopelagic zones, from the surface down to approximately 250 meters (820 feet), though occasionally deeper.
- Ambiente
- Open ocean (pelagic), typically found in tropical and subtropical waters, preferring temperatures between 20-30°C. Often associated with oceanic islands, seamounts, and areas of upwelling.
- Distribuição geográfica
- Circumglobal in tropical and subtropical waters of the Atlantic, Pacific, and Indian Oceans. Absent from the Mediterranean Sea.
Informações sobre aquário
- Nível de cuidado: expert
- Temperamento: aggressive
- Alimentação: carnivore
- Tamanho mínimo do aquário: Not suitable for home aquariums; requires vast ocean environments.
- Temperatura: 20-30°C (68-86°F)
- Nível de pH: 8.0-8.4
- Dureza da água: Not applicable for aquarium setting
- Compatibilidade: Not compatible with other species in captivity due to size and predatory nature; typically kept in large public aquariums with specialized facilities.
- Requisitos especiais: Requires extremely large, open-ocean-like environments with strong currents and vast swimming space. Not a species for private aquarists.
Informações no ambiente natural
- Estado de conservação: near threatened
- Sazonalidade: Present year-round in tropical waters, but local abundance and migratory patterns can lead to seasonal peaks in certain regions.
- Preço de mercado: High, varies significantly by region, season, and quality (e.g., sashimi-grade).
- Importância comercial: high
- Sabor: Mild to medium-strong, rich, and meaty.
- Textura: Firm, dense, and flaky when cooked; smooth and buttery when raw (sashimi-grade).
- Métodos de preparo: Grilled, Seared, Baked, Sashimi, Sushi, Canned
- Valor nutricional: Excellent source of protein, Omega-3 fatty acids, Vitamin B12, Niacin, and Selenium. Relatively low in saturated fat.
Fatos principais
Speed Demonbehavior
Yellowfin Tuna are incredibly fast swimmers, capable of reaching speeds up to 80 km/h (50 mph) in short bursts, making them one of the ocean's top predators.
Warm-Blooded Huntersbehavior
Like other tunas, Yellowfin are endothermic, meaning they can maintain a body temperature higher than the surrounding water, allowing them to hunt efficiently in cooler depths.
Long-Distance Migratorsbehavior
Yellowfin Tuna undertake extensive migrations across ocean basins, often covering thousands of kilometers in search of food and suitable spawning grounds.
Sashimi Starinteresting
Yellowfin Tuna is one of the most popular species for sashimi and sushi worldwide, highly valued for its firm texture and rich flavor.
Schooling Behaviorbehavior
They often form large schools, sometimes associating with other tuna species, dolphins, or whales, which can aid in foraging and provide protection.
Informações de segurança
Seguro- Nível de segurança: safe
- Venenoso: Não
- Comestibilidade: edible
- Observações de manuseio: No venomous spines or dangerous features. Handle with care due to size and power, especially when fresh out of water. Large specimens can cause injury with powerful tail beats. Standard fish handling precautions apply.
Espécies similares
Albacore Tuna
Thunnus alalunga
Albacore has exceptionally long pectoral fins that extend well past the origin of the second dorsal fin. Its finlets are not as brightly yellow, and its body is generally more slender.
Bigeye Tuna
Thunnus obesus
Bigeye Tuna has noticeably larger eyes, a more robust body, and its second dorsal and anal fins are not as elongated as in large Yellowfin. The finlets are typically less intensely yellow. The vent is oval or teardrop-shaped in Bigeye, compared to round in Yellowfin.
Skipjack Tuna
Katsuwonus pelamis
Skipjack Tuna is smaller, has distinct dark longitudinal stripes on its belly, and lacks the elongated dorsal and anal fins and bright yellow finlets of the Yellowfin.
Classificação científica
- Reino
- Animalia
- Filo
- Chordata
- Classe
- Actinopterygii
- Ordem
- Scombriformes
- Família
- Scombridae
- Gênero
- Thunnus
- Espécie
- Thunnus albacares
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