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Heteropriacanthus cruentatus, commonly known as the Glassy Sweeper or Bigeye, is a nocturnal, predatory fish belonging to the family Priacanthidae. It is characterized by its large eyes, typically reddish coloration, and compressed body. These fish are often found in caves, under ledges, or in crevices during the day, emerging at night to feed on smaller fishes and crustaceans. They are widely distributed in tropical and subtropical waters globally.
Caratteristiche fisiche
- Forma del corpo
- compressed
- Colorazione
- Typically reddish to silvery-red, often with irregular darker blotches or spots. Fins are usually reddish. Can exhibit rapid color changes depending on mood or environment, from pale pink to deep red. Juveniles may have iridescent spots.
- Tipo di squame
- ctenoid
- Posizione della bocca
- superior
- Caratteristiche distintive
- Very large, prominent eyes, often appearing glassy or reflective, adapted for nocturnal vision., Deep, compressed body., Large, oblique mouth with a projecting lower jaw., Rough, ctenoid scales., Pelvic fins are large and often blackish, especially in adults.
- Pinna dorsale
- Single dorsal fin with 10 spines and 12-14 soft rays. The spiny portion is longer than the soft-rayed portion.
- Pinna caudale
- Caudal fin is emarginate to slightly lunate.
- Pinna pettorale
- Pectoral fins are relatively small.
- Pinne distintive
- Pelvic fins are large, inserted anterior to the pectoral fins, and often have a dark, almost black, coloration, particularly in larger individuals. 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 or glassy-looking eyes, which are disproportionately large compared to the head.
Body Shape and Color
Deep, compressed body, typically reddish to silvery-red. Look for irregular darker blotches or spots on the body, which can vary in intensity.
Mouth
Large, oblique mouth with a prominent, projecting lower jaw.
Pelvic Fins
Relatively long pelvic fins, often with a distinct dark or blackish coloration, especially in adults.
Fin Ray Count
Dorsal fin with 10 spines and 12-14 soft rays; anal fin with 3 spines and 13-15 soft rays. These counts can help distinguish it from other priacanthids.
Habitat
- Tipo di acqua
- saltwater
- Profondità
- Typically found from shallow reef crests down to about 200 meters (650 feet), most commonly in depths of 5-50 meters.
- Ambiente
- Coral reefs, rocky reefs, caves, crevices, and under ledges. Prefers areas with plenty of hiding spots during the day. Juveniles may be found in shallower, more protected areas.
- Areale geografico
- Circumtropical and subtropical. Found in the Atlantic Ocean (from Florida and Bermuda south to Brazil, including the Caribbean and Gulf of Mexico, and eastern Atlantic from Mauritania to Angola), Indian Ocean, and Pacific Ocean (from Japan south to Australia and across to the Americas).
Informazioni sull'acquario
- Livello di cura: intermediate
- Temperamento: semi-aggressive
- Dieta: carnivore
- Dimensione minima della vasca: 180 gallons
- Temperatura: 72-78°F (22-26°C)
- Livello di pH: 8.1-8.4
- Durezza: 8-12 dKH
- Compatibilità: Can be kept with other large, semi-aggressive fish. Avoid keeping with very small fish or invertebrates that could be prey. May be aggressive towards conspecifics in smaller tanks.
- Requisiti speciali: Requires ample hiding places (caves, overhangs) for daytime retreat. Needs a well-established tank with excellent filtration. Provide a varied diet of meaty foods. Nocturnal feeding is preferred.
Informazioni in natura
- Stato di conservazione: least concern
- Stagionalità: No specific seasonal patterns for availability; caught year-round in its range.
- Prezzo di mercato: Low to moderate, primarily for local consumption or as bycatch.
- Importanza commerciale: low
- Sapore: Mild, slightly sweet
- Consistenza: Flaky, white meat
- Metodi di cottura: fried, baked, grilled, steamed
- Valore nutrizionale: Good source of protein and omega-3 fatty acids.
Fatti chiave
Nocturnal Hunterbehavior
Heteropriacanthus cruentatus is strictly nocturnal, spending its days hidden in dark recesses of reefs and emerging only after sunset to hunt.
Giant Eyesamazing
Its exceptionally large eyes are a key adaptation for low-light conditions, allowing it to effectively hunt in the darkness of night.
Color Changing Abilitiesbehavior
This species can rapidly change its body coloration from pale pink to deep red, likely for camouflage or communication.
Solitary or Small Groupsbehavior
While often seen solitary, they can sometimes form small aggregations in their daytime hiding spots.
Circumtropical Distributioninteresting
Heteropriacanthus cruentatus boasts one of the widest distributions among reef fish, found in tropical and subtropical waters of all major oceans.
Informazioni di sicurezza
Maneggiare con cura- Livello di sicurezza: caution
- Velenoso: No
- Commestibilità: edible
- Note sul maneggio: While not venomous, the dorsal, anal, and pelvic fins possess sharp spines that can inflict painful punctures. Handle with care to avoid injury. They are generally not aggressive towards humans unless provoked or handled.
Specie simili
Shortfin Bigeye
Pristigenys alta
Pristigenys alta has a much deeper, more rounded body profile, shorter pelvic fins, and typically a more uniform red coloration without the distinct blotches often seen on Heteropriacanthus cruentatus. Its dorsal and anal fins are also higher and more rounded.
Longfin Bigeye
Cookeolus japonicus
Cookeolus japonicus is distinguished by its extremely elongated pelvic fins, which can extend well past the anal fin origin, and a more uniformly red body. Its dorsal and anal fins are also more pointed posteriorly.
Moontail Bullseye
Priacanthus hamrur
Priacanthus hamrur typically has a more silvery-pink to red body, often with faint horizontal lines, and a distinctly lunate (crescent-shaped) caudal fin. Its eyes are large but generally not as 'glassy' or reflective as H. cruentatus, and its pelvic fins are not as prominently dark.
Classificazione scientifica
- Regno
- Animalia
- Phylum
- Chordata
- Classe
- Actinopterygii
- Ordine
- Perciformes
- Famiglia
- Priacanthidae
- Genere
- Heteropriacanthus
- Specie
- cruentatus
Esplora Glassy Sweeper
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