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Caranx ignobilis, commonly known as the Giant Trevally or Xaréu, is a large, powerful, and predatory marine fish belonging to the jack family, Carangidae. It is renowned for its aggressive hunting behavior, impressive size, and significant recreational and commercial value. This species is a top-tier predator in its diverse habitats, playing a crucial role in marine ecosystems.
Características físicas
- Formato do corpo
- compressed
- Coloração
- Adults are typically silvery-grey to dark grey or black dorsally, fading to a lighter silvery-white ventrally. Large males can become almost entirely black during spawning. Juveniles often have faint vertical bars. A small, dark spot is usually present on the operculum.
- Tipo de escama
- cycloid
- Posição da boca
- terminal
- Características distintivas
- Steeply sloped head profile, Large, powerful, deeply forked caudal fin, Prominent scutes (bony plates) along the lateral line, particularly on the posterior section, Large mouth with strong jaws and numerous small, conical teeth, Two separate dorsal fins, the first with 8 spines, the second with 1 spine and 18-21 soft rays, Anal fin with 2 detached spines followed by 1 spine and 15-17 soft rays
- Nadadeira dorsal
- Two dorsal fins; the first is short with 8 spines, the second is longer with 1 spine and 18-21 soft rays.
- Nadadeira caudal
- Deeply forked and powerful, characteristic of fast-swimming pelagic predators.
- Nadadeira peitoral
- Long and falcate (sickle-shaped), extending beyond the origin of the second dorsal fin.
- Nadadeiras características
- Anal fin has two anteriorly detached spines, followed by one spine and 15-17 soft rays. The posterior section of the lateral line is strongly arched anteriorly and then straight, armed with 25-38 strong scutes.
Dicas de identificação
Size and Body Shape
Large, robust body with a steep head profile. Can reach up to 170 cm (67 inches) in length and over 80 kg (176 lbs) in weight, though average adult size is closer to 80-100 cm.
Coloration
Silvery-grey to dark grey/black dorsally, lighter ventrally. Large males can be almost entirely black. A small, dark opercular spot is usually present.
Lateral Line Scutes
The posterior straight section of the lateral line is armed with 25-38 prominent, strong scutes, which are a key identifying feature among Caranx species.
Fin Structure
Two distinct dorsal fins and a deeply forked caudal fin. The long, falcate pectoral fins are also characteristic.
Habitat
- Tipo de água
- saltwater
- Profundidade
- Typically found from the surface down to depths of 188 meters (617 feet), though most commonly observed in shallower coastal waters.
- Ambiente
- Inhabits a wide range of marine environments including coral reefs, rocky reefs, lagoons, estuaries, bays, and open coastal waters. Juveniles often frequent shallower, protected areas like mangroves and seagrass beds. Adults are often associated with structural features such as drop-offs, pinnacles, and wrecks.
- Distribuição geográfica
- Indo-Pacific region, from the Red Sea and East Africa, across the Indian Ocean to the central Pacific, including Hawaii, and north to Japan and south to Australia. Not found in the Atlantic Ocean.
Informações sobre aquário
- Nível de cuidado: expert
- Temperamento: aggressive
- Alimentação: carnivore
- Tamanho mínimo do aquário: Not suitable for home aquaria due to immense size and predatory nature. Requires public aquarium-scale exhibits.
- Temperatura: 24-28°C (75-82°F)
- Nível de pH: 8.1-8.4
- Dureza da água: 1.023-1.026 SG
- Compatibilidade: Only compatible with very large, robust fish of similar size and temperament in extremely large, specialized exhibits. Not suitable for mixed reef or community tanks.
- Requisitos especiais: Requires vast swimming space, powerful filtration, and a constant supply of large live or frozen prey. Not recommended for private aquarists.
Informações no ambiente natural
- Estado de conservação: least concern
- Sazonalidade: Present year-round in tropical and subtropical waters, but local abundance and migratory patterns can influence seasonal availability for fishing. Spawning typically occurs during warmer months.
- Preço de mercado: Varies significantly by region and demand, often sold as fresh fillets. Can fetch high prices in some markets.
- Importância comercial: medium
- Sabor: Firm, white flesh with a mild to strong fishy flavor, depending on size and diet.
- Textura: Firm and meaty, can be somewhat dry if overcooked.
- Métodos de preparo: Grilling, Baking, Frying, Smoking, Sashimi (for very fresh, properly handled fish)
- Valor nutricional: Good source of protein, Omega-3 fatty acids, and various vitamins and minerals. Larger specimens may accumulate higher levels of mercury.
Fatos principais
Apex Predatorbehavior
The Giant Trevally is an apex predator in many reef and coastal environments, preying on a wide variety of fish, crustaceans, and cephalopods. It is known for its ambush tactics and powerful strikes.
Black Malesamazing
During spawning, large male Giant Trevally can turn almost entirely black, a striking display believed to be related to courtship and territorial defense.
Long-Distance Migratorsbehavior
While often associated with specific reef systems, Giant Trevally are known to undertake significant migrations, especially for spawning, covering hundreds of kilometers.
Tool Use (Indirect)interesting
Observations have shown GTs using the turbulence created by large sharks to ambush prey, demonstrating a sophisticated understanding of their environment and other predators.
Ciguatera Riskinteresting
Larger specimens of Giant Trevally, particularly those from certain regions, can accumulate ciguatera toxins, making them unsafe for human consumption. This is a significant safety consideration for anglers.
Informações de segurança
Manusear com cuidado- Nível de segurança: caution
- Venenoso: Não
- Comestibilidade: edible
- Observações de manuseio: Giant Trevally are powerful fish with sharp scutes on their lateral line and strong jaws. Exercise extreme caution when handling, especially larger specimens, to avoid cuts from scutes or fin spines, and potential injury from their thrashing. Use appropriate tools like lip grippers and gloves. Release practices should minimize stress and physical harm to the fish.
Espécies similares
Bluefin Trevally
Caranx melampygus
Distinguished by its iridescent blue fins and numerous small blue to black spots on its flanks. Generally smaller than C. ignobilis and has fewer, less prominent scutes on the lateral line (26-38 vs. 25-38 for C. ignobilis, but C. melampygus scutes are less robust).
Bigeye Trevally
Caranx sexfasciatus
Possesses a noticeably larger eye relative to its head size, especially in juveniles. Adults are typically more silvery and lack the dark opercular spot or the extreme dark coloration of large male C. ignobilis. The scutes are also less pronounced.
Blacktip Trevally
Caranx heberi
Characterized by a distinct black tip on the upper lobe of the caudal fin and often a black spot on the pectoral fin. Its body is generally more elongated than C. ignobilis.
Classificação científica
- Reino
- Animalia
- Filo
- Chordata
- Classe
- Actinopterygii
- Ordem
- Carangiformes
- Família
- Carangidae
- Gênero
- Caranx
- Espécie
- Caranx ignobilis
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