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Apri l'appDescrizione
Xiphias gladius, commonly known as the swordfish, is a large, highly migratory predatory fish characterized by a long, flattened, pointed bill (sword) that is nearly round in cross-section. It is a pelagic species found in tropical, subtropical, and temperate waters of the Atlantic, Pacific, and Indian Oceans. Renowned for its speed and agility, the swordfish is a solitary hunter that undertakes extensive migrations, often covering vast distances between feeding and spawning grounds. Its unique thermoregulation system allows it to maintain elevated brain and eye temperatures, enhancing its visual acuity in cold, deep waters.
Caratteristiche fisiche
- Forma del corpo
- torpedo
- Colorazione
- Dorsal side is dark brown to blackish-blue, fading to a lighter brown or silvery-white on the ventral side. Fins are dark brown to black.
- Tipo di squame
- none
- Posizione della bocca
- terminal
- Caratteristiche distintive
- Long, flattened, pointed bill (sword) that is nearly round in cross-section, comprising about one-third of its total body length., Absence of scales in adults (juveniles have scales)., Absence of pelvic fins in adults., A single, prominent keel on each side of the caudal peduncle in adults., Large eyes, adapted for low-light conditions.
- Pinna dorsale
- Two dorsal fins; the first is tall and crescent-shaped, located far forward on the back. The second is much smaller and located near the caudal peduncle. In juveniles, the two dorsal fins are continuous, but they separate with age.
- Pinna caudale
- Large, deeply forked, and crescent-shaped (lunate caudal fin), indicative of a fast-swimming pelagic fish.
- Pinna pettorale
- Long and narrow, positioned low on the body.
- Pinne distintive
- No pelvic fins in adults. Anal fin is also divided into two, similar to the dorsal fin structure.
Consigli per l'identificazione
Bill (Sword)
The most distinguishing feature is its long, flattened, sword-like bill, which is significantly longer and flatter than that of marlins or sailfish. It is nearly round in cross-section, unlike the more conical bill of marlins.
Dorsal Fin
Adult swordfish have a very tall, crescent-shaped first dorsal fin and a much smaller, separate second dorsal fin. This contrasts with marlins and sailfish, which typically have a continuous or nearly continuous dorsal fin.
Pelvic Fins
Adult swordfish lack pelvic fins entirely, a key differentiating characteristic from all other billfish species.
Scales
Adult swordfish are scaleless, possessing only rough dermal denticles, whereas marlins and sailfish retain scales throughout their lives.
Caudal Keels
Possesses a single, prominent lateral keel on each side of the caudal peduncle, unlike marlins which have two.
Habitat
- Tipo di acqua
- saltwater
- Profondità
- Epipelagic to mesopelagic zones, typically found from the surface down to 650 meters (2,130 feet), but can dive to over 2,000 meters (6,500 feet) in search of prey.
- Ambiente
- Open ocean (pelagic), preferring areas with strong currents and upwellings. Tolerant of a wide range of temperatures, from 5-27°C (41-81°F), due to its unique thermoregulation.
- Areale geografico
- Cosmopolitan in tropical, subtropical, and temperate waters of the Atlantic, Pacific, and Indian Oceans. Absent from polar regions.
Informazioni sull'acquario
- Livello di cura: expert
- Temperamento: aggressive
- Dieta: carnivore
- Dimensione minima della vasca: Not suitable for aquarium life due to immense size and migratory nature.
- Temperatura: Not applicable
- Livello di pH: Not applicable
- Durezza: Not applicable
- Compatibilità: Not applicable
- Requisiti speciali: Not suitable for captivity. Requires vast oceanic environments.
Informazioni in natura
- Stato di conservazione: least concern
- Stagionalità: Available year-round in various parts of its global range, with peak fishing seasons varying regionally. For example, in the Mediterranean, it's often targeted from spring to autumn.
- Prezzo di mercato: Varies significantly by region, season, and demand, often high due to its popularity as a food fish.
- Importanza commerciale: high
- Sapore: Mild, slightly sweet, and savory.
- Consistenza: Firm, meaty, and steak-like, with large flakes.
- Metodi di cottura: Grilling, Broiling, Baking, Pan-searing, Smoking
- Valore nutrizionale: Excellent source of protein, selenium, niacin, vitamin B12, and phosphorus. Also a good source of omega-3 fatty acids, though it can accumulate mercury due to its position as a top predator.
Fatti chiave
The 'Sword' is Not for Stabbingbehavior
Despite its name, the swordfish primarily uses its bill to slash and stun prey, rather than to spear it. It swims through schools of fish, swinging its head to injure or kill multiple prey items, which it then consumes.
Warm-Blooded Eyes and Brainamazing
Swordfish possess a specialized organ near their eyes that heats their brain and eyes. This allows them to maintain optimal visual acuity and neurological function when diving into cold, deep waters to hunt, giving them a significant predatory advantage.
Incredible Speedrecord
Swordfish are among the fastest fish in the ocean, capable of bursts of speed exceeding 80 km/h (50 mph). Their streamlined body and powerful caudal fin contribute to their remarkable velocity.
Deep Diversbehavior
While often found in surface waters, swordfish are known to undertake deep dives, sometimes exceeding 2,000 meters (6,500 feet), to forage for prey in the mesopelagic zone.
Solitary Wanderersbehavior
Unlike many schooling fish, swordfish are generally solitary creatures, though they may be found in loose aggregations in areas of abundant food. They undertake extensive individual migrations across ocean basins.
Informazioni di sicurezza
Maneggiare con cura- Livello di sicurezza: caution
- Velenoso: No
- Commestibilità: edible
- Note sul maneggio: While not venomous, the swordfish's bill is extremely sharp and can cause severe injury. Extreme caution must be exercised when handling a live or freshly caught swordfish, especially during landing. The bill can be used defensively and offensively. Anglers should be aware of the potential for the fish to thrash violently, posing a risk of impalement or blunt force trauma. Mercury levels can be high in larger, older swordfish, so consumption guidelines should be followed, especially for pregnant women and young children.
Specie simili
Blue Marlin
Makaira nigricans
Blue marlins have a rounder, more conical bill, two distinct lateral keels on the caudal peduncle, and retain pelvic fins and scales as adults. Their dorsal fin is typically lower and more continuous than that of a swordfish.
White Marlin
Kajikia albida
White marlins have a shorter, more rounded bill, two distinct lateral keels, and retain pelvic fins and scales. Their dorsal fin is also lower and more continuous.
Sailfish
Istiophorus platypterus
Sailfish are easily distinguished by their exceptionally tall, sail-like dorsal fin. They also have a rounder bill, two caudal keels, and retain pelvic fins and scales.
Black Marlin
Istiompax indica
Black marlins have a shorter, thicker, and more conical bill, two caudal keels, and retain pelvic fins and scales. Their pectoral fins are rigid and cannot be folded back against the body, unlike other marlins and swordfish.
Classificazione scientifica
- Regno
- Animalia
- Phylum
- Chordata
- Classe
- Actinopterygii
- Ordine
- Istiophoriformes
- Famiglia
- Xiphiidae
- Genere
- Xiphias
- Specie
- gladius
Esplora Swordfish
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