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Thunnus alalunga, commonly known as Albacore Tuna or 'Tonno Bianco' in Italian, is a species of tuna in the family Scombridae. It is a highly migratory, pelagic fish found in tropical and temperate waters across all oceans. Renowned for its white, firm flesh, it is a commercially important species for fisheries worldwide. Albacore are characterized by their exceptionally long pectoral fins, which can extend beyond the second dorsal fin, a key distinguishing feature.
Caratteristiche fisiche
- Forma del corpo
- torpedo
- Colorazione
- Dark metallic blue to black on the dorsal side, fading to silvery-white on the flanks and belly. The first dorsal fin is deep yellow, the second dorsal and anal fins are light yellow, and the finlets are dark.
- Tipo di squame
- cycloid
- Posizione della bocca
- terminal
- Caratteristiche distintive
- Exceptionally long pectoral fins, typically extending beyond the origin of the second dorsal fin, sometimes reaching past the anal finlets., Small, conical teeth., Relatively large eyes compared to other tuna species., Seven to nine dorsal finlets and seven to eight anal finlets.
- Pinna dorsale
- Two dorsal fins; the first is spiny and triangular, the second is soft-rayed and similar in shape but smaller. Followed by 7-9 finlets.
- Pinna caudale
- Deeply forked caudal fin (lunate), characteristic of fast-swimming pelagic fish.
- Pinna pettorale
- Unusually long, extending well past the origin of the second dorsal fin, often reaching the anal finlets.
- Pinne distintive
- The elongated pectoral fins are the most distinctive feature, setting it apart from other Thunnus species.
Consigli per l'identificazione
Pectoral Fin Length
The most reliable identifier: the pectoral fin is remarkably long, extending past the second dorsal fin origin, often reaching the anal finlets. No other tuna species has pectoral fins this long relative to body size.
Coloration
Dark metallic blue back, silvery-white belly. The first dorsal fin is distinctly yellow, and the second dorsal and anal fins are light yellow.
Body Shape
Typical fusiform (torpedo-shaped) tuna body, but often appears more slender than some other tuna species.
Eyes
Relatively large eyes compared to other tuna, which is an adaptation for hunting in deeper, dimmer waters.
Habitat
- Tipo di acqua
- saltwater
- Profondità
- Primarily epipelagic and mesopelagic, typically found in waters from the surface down to 600 meters (2,000 feet), but most commonly between 100-200 meters.
- Ambiente
- Open ocean (pelagic), preferring temperate and tropical waters. They are highly migratory, undertaking extensive transoceanic movements.
- Areale geografico
- Cosmopolitan distribution in tropical and temperate waters of the Atlantic, Pacific, and Indian Oceans, and the Mediterranean Sea. Absent from polar waters.
Informazioni sull'acquario
- Livello di cura: expert
- Temperamento: aggressive
- Dieta: carnivore
- Dimensione minima della vasca: Not suitable for home aquaria; requires oceanic conditions and immense space.
- Temperatura: 10-25°C (50-77°F)
- Livello di pH: 8.0-8.4
- Durezza: Not applicable for aquarium setting, oceanic salinity
- Compatibilità: Not compatible with other species in captivity due to size, speed, and pelagic nature.
- Requisiti speciali: Requires vast, open ocean environments; impossible to maintain in typical aquarium settings due to its migratory and pelagic lifestyle, high metabolic rate, and large size.
Informazioni in natura
- Stato di conservazione: near threatened
- Stagionalità: Seasonal availability varies by region, generally peaking during warmer months when they migrate to feeding grounds. For example, in the North Atlantic, they are typically targeted from late spring through autumn.
- Prezzo di mercato: Varies significantly by region, season, and product form (fresh, frozen, canned); generally commands a higher price than skipjack or yellowfin due to its white flesh.
- Importanza commerciale: high
- Sapore: Mild, rich, and savory with a clean finish.
- Consistenza: Firm, flaky, and moist, often described as 'steak-like'.
- Metodi di cottura: Grilling, Pan-searing, Baking, Canning, Sashimi
- Valore nutrizionale: Excellent source of lean protein, Omega-3 fatty acids (EPA and DHA), Vitamin B12, Niacin, and Selenium. Lower mercury content compared to larger tuna species like Bluefin, but still present.
Fatti chiave
Long-Distance Migratorsbehavior
Albacore tuna undertake some of the longest migrations of any fish, often crossing entire ocean basins between spawning and feeding grounds.
White Meat Tunainteresting
Albacore is the only tuna species permitted to be labeled as 'white meat tuna' in the United States due to its distinctively pale flesh, which is a result of its diet and muscle composition.
Temperature Preferencebehavior
Albacore prefer cooler temperate waters (15-20°C) compared to other tropical tuna species, which influences their migratory patterns and distribution.
Deep Diversbehavior
While often found near the surface, albacore are known to dive to considerable depths, sometimes over 600 meters, likely in pursuit of prey.
Fast Swimmersbehavior
Like all tuna, Thunnus alalunga are incredibly fast swimmers, capable of bursts of speed to catch prey and evade predators, aided by their streamlined, fusiform body and lunate tail.
Informazioni di sicurezza
Sicuro- Livello di sicurezza: safe
- Velenoso: No
- Commestibilità: edible
- Note sul maneggio: No specific handling precautions beyond standard fish handling (e.g., sharp fins, slippery body). Large specimens can be powerful and require appropriate gear for landing. Mercury content should be considered for frequent consumption, especially for vulnerable populations.
Specie simili
Yellowfin Tuna
Thunnus albacares
Yellowfin tuna have shorter pectoral fins that do not extend beyond the origin of the second dorsal fin. They also have distinctly bright yellow dorsal and anal fins and finlets, which are more pronounced than in albacore.
Bigeye Tuna
Thunnus obesus
Bigeye tuna have pectoral fins that are longer than yellowfin but typically do not reach past the second dorsal fin origin (though some larger individuals may approach this). Their eyes are proportionally much larger than albacore, and their body is more robust and deeper-bodied.
Bluefin Tuna (Atlantic, Pacific, Southern)
Thunnus thynnus, Thunnus orientalis, Thunnus maccoyii
Bluefin tuna have significantly shorter pectoral fins that do not reach the second dorsal fin. They are generally much larger and more robust-bodied, with a darker, almost black, dorsal coloration and a more uniform silvery-white belly. Their finlets are typically duller in color.
Classificazione scientifica
- Regno
- Animalia
- Phylum
- Chordata
- Classe
- Actinopterygii
- Ordine
- Scombriformes
- Famiglia
- Scombridae
- Genere
- Thunnus
- Specie
- T. alalunga
Esplora Albacore Tuna
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