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Priacanthus arenatus, commonly known as the Catalufa or Atlantic Bigeye, is a nocturnal, predatory fish belonging to the family Priacanthidae. It is characterized by its large eyes, typically reddish coloration, and deep, compressed body. These features are adaptations for its crepuscular and nocturnal lifestyle in deeper reef environments. It is a moderately sized fish, often encountered by divers and anglers, and plays a role in the trophic dynamics of its habitat.
Caratteristiche fisiche
- Forma del corpo
- compressed
- Colorazione
- Typically reddish to silvery-red, often with silvery or whitish blotches or bars, especially when stressed or at night. The fins are usually reddish. Can exhibit rapid color changes depending on mood or environment. Juveniles may have more pronounced spots or patterns.
- Tipo di squame
- ctenoid
- Posizione della bocca
- superior
- Caratteristiche distintive
- Very large eyes, characteristic of nocturnal species, with a reflective tapetum lucidum., Deep, compressed body., Large, oblique mouth with a projecting lower jaw., Rough, ctenoid scales., Pelvic fins are large and often blackish, sometimes with a dark membrane between the rays.
- Pinna dorsale
- Single dorsal fin with 10 spines and 12-14 soft rays. The spiny and soft-rayed portions are continuous.
- Pinna caudale
- Caudal fin is truncate to slightly emarginate.
- Pinna pettorale
- Pectoral fins are relatively short, with 18-20 rays.
- Pinne distintive
- Pelvic fins are large, originating anterior to the pectoral fin base, and are often dark or blackish, especially in adults. Anal fin has 3 spines and 13-15 soft rays.
Consigli per l'identificazione
Eyes
The most striking feature is the exceptionally large, often reddish, eyes, which are disproportionately large compared to the head.
Body Shape and Color
Deep, compressed body with a reddish to silvery-red overall coloration. Look for potential silvery blotches or bars, especially at night or when caught.
Pelvic Fins
The large, often dark or blackish pelvic fins are a key identifier, originating anterior to the pectoral fin base.
Mouth
The large, oblique mouth with a projecting lower jaw is characteristic of its predatory feeding style.
Fin Ray Counts
Dorsal fin: X spines, 12-14 soft rays. Anal fin: III spines, 13-15 soft rays. These counts can help distinguish it from other Priacanthus species.
Habitat
- Tipo di acqua
- saltwater
- Profondità
- Typically found at depths ranging from 10 to 250 meters (33 to 820 feet), though most commonly observed between 20 and 100 meters. Juveniles may be found in shallower waters.
- Ambiente
- Inhabits rocky reefs, coral reefs, and rubble areas. Often found near drop-offs, caves, and ledges where it can find shelter during the day. Prefers clear oceanic waters.
- Areale geografico
- Widespread in the tropical and subtropical Atlantic Ocean, including the Caribbean Sea, Gulf of Mexico, and along the coasts of North and South America, as well as the eastern Atlantic from Portugal to Angola, including the Canary Islands and Madeira.
Informazioni sull'acquario
- Livello di cura: intermediate
- Temperamento: semi-aggressive
- Dieta: carnivore
- Dimensione minima della vasca: 180 gallons (680 liters)
- Temperatura: 72-78°F (22-26°C)
- Livello di pH: 8.1-8.4
- Durezza: 8-12 dKH
- Compatibilità: Best kept with other large, semi-aggressive fish. Avoid keeping with very small fish or invertebrates as they may be preyed upon. Can be territorial with conspecifics in smaller tanks.
- Requisiti speciali: Requires a large tank with ample hiding places and subdued lighting, especially during the day. A varied diet of meaty foods is essential. Good water quality is paramount.
Informazioni in natura
- Stato di conservazione: least concern
- Stagionalità: No specific seasonal patterns for availability; caught year-round in its range.
- Prezzo di mercato: Varies by region, generally moderate.
- Importanza commerciale: medium
- Sapore: Mild, slightly sweet
- Consistenza: Flaky, white meat
- Metodi di cottura: Baked, Fried, Grilled, Steamed
- Valore nutrizionale: Good source of protein and omega-3 fatty acids.
Fatti chiave
Nocturnal Hunterbehavior
Catalufa are primarily nocturnal predators, using their exceptionally large eyes to hunt small fish, crustaceans, and cephalopods under low light conditions.
Deep-Sea Dwellersinteresting
While often found on reefs, they prefer deeper waters and are frequently associated with drop-offs and ledges, retreating to caves and crevices during the day.
Color Changing Abilitiesamazing
Like many reef fish, Priacanthus arenatus can rapidly change its coloration, from bright red to silvery or mottled, depending on its environment, stress levels, or activity.
Tapetum Lucidumevolution
Their large eyes possess a tapetum lucidum, a reflective layer behind the retina that enhances vision in dim light, similar to the 'eyeshine' seen in cats.
Informazioni di sicurezza
Sicuro- Livello di sicurezza: safe
- Velenoso: No
- Commestibilità: edible
- Note sul maneggio: No specific venomous spines. Handle with care due to sharp fin spines, as with any fish. The large eyes are delicate.
Specie simili
Shortfin Bigeye
Priacanthus sagittarius
P. sagittarius typically has a more elongated body, a more pointed snout, and generally lacks the prominent dark pelvic fins of P. arenatus. Its caudal fin is also more deeply forked. Geographic range also differs, with P. sagittarius being Indo-Pacific.
Red Bigeye
Priacanthus macracanthus
P. macracanthus (Indo-Pacific) has a more uniformly red coloration and often exhibits a series of small, dark spots along the lateral line, which are absent in P. arenatus. The fin ray counts can also differ slightly.
Glasseye Snapper
Heteropriacanthus cruentatus
While also a 'bigeye' fish, H. cruentatus has a more rounded caudal fin and often displays more prominent vertical banding or blotches. Its body is generally less deep and more elongated than P. arenatus. The pelvic fins are typically not as distinctly dark.
Classificazione scientifica
- Regno
- Animalia
- Phylum
- Chordata
- Classe
- Actinopterygii
- Ordine
- Perciformes
- Famiglia
- Priacanthidae
- Genere
- Priacanthus
- Specie
- Priacanthus arenatus
Esplora Catalufa
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