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Apri l'appDescrizione
Raja asterias, commonly known as the Starry Ray or Starry Skate, is a species of cartilaginous fish belonging to the family Rajidae. It is characterized by its flattened body, rhomboidal disc, and a tail that is distinct from the disc. The dorsal surface is typically adorned with numerous small, star-like spines, giving it its common name. This species is a demersal inhabitant of continental shelves and slopes, primarily found in the Mediterranean Sea and adjacent Atlantic waters.
Caratteristiche fisiche
- Forma del corpo
- flat
- Colorazione
- Dorsal surface typically light brown to greyish-brown, often with irregular darker spots or blotches. Ventral surface is white or cream-colored. The most distinctive feature is the presence of numerous small, star-like spines (stellate denticles) scattered across the dorsal disc and tail, which are more prominent in juveniles and along the midline in adults.
- Tipo di squame
- placoid
- Posizione della bocca
- inferior
- Caratteristiche distintive
- Rhomboidal disc, slightly wider than long., Snout moderately pointed., Eyes relatively small, followed by spiracles., Dorsal surface covered with numerous stellate denticles (star-like spines)., A row of larger, sharp thorns along the midline of the disc and tail, more pronounced in females and juveniles., Two small dorsal fins located near the tip of the tail., Caudal fin reduced to a small fold.
- Pinna dorsale
- Two small, similarly sized dorsal fins located close to the tip of the tail, separated by a short interspace.
- Pinna caudale
- Reduced to a low caudal fold, not a true fin.
- Pinna pettorale
- Large, forming the main disc of the body, confluent with the head.
- Pinne distintive
- Pelvic fins are bilobed, with the anterior lobe distinct from the posterior.
Consigli per l'identificazione
Dorsal Spines
The most reliable identifier is the presence of numerous small, star-shaped spines (stellate denticles) scattered across the entire dorsal surface of the disc and tail. These are particularly noticeable to the touch.
Midline Thorns
A distinct row of larger, sharp thorns runs along the midline of the disc and tail, which can be used to differentiate it from some other ray species.
Snout Shape
The snout is moderately pointed, not acutely sharp nor broadly rounded, which helps distinguish it from species like Raja clavata (Thornback Ray) or Raja miraletus (Brown Ray).
Coloration and Pattern
While variable, the typical light brown to greyish-brown dorsal coloration with occasional darker spots or blotches, combined with the stellate denticles, is characteristic.
Habitat
- Tipo di acqua
- saltwater
- Profondità
- Typically found on continental shelves and upper slopes, ranging from 20 to 300 meters, though occasionally shallower or deeper (down to 500 meters).
- Ambiente
- Demersal, inhabiting sandy, muddy, or gravelly bottoms. Prefers relatively cool waters.
- Areale geografico
- Primarily the Mediterranean Sea, including the Adriatic and Aegean Seas. Also found in the eastern Atlantic Ocean from Portugal to Morocco, including the Canary Islands.
Informazioni sull'acquario
- Livello di cura: expert
- Temperamento: peaceful
- Dieta: carnivore
- Dimensione minima della vasca: Not suitable for typical home aquaria due to size and specialized needs; requires very large, specialized public aquarium setups.
- Temperatura: 10-18°C (50-64°F)
- Livello di pH: 7.8-8.4
- Durezza: High (marine salinity)
- Compatibilità: Only with other large, peaceful, cold-water marine species in very large, specialized exhibits.
- Requisiti speciali: Requires extremely large tank dimensions, excellent filtration, stable cold-water temperatures, and a soft substrate for burying. Diet must consist of fresh, high-quality marine invertebrates and fish. Not recommended for private aquarists.
Informazioni in natura
- Stato di conservazione: near threatened
- Stagionalità: Can be caught year-round, but fishing effort and catch rates may vary seasonally due to reproductive cycles and environmental factors. Spawning typically occurs in spring and summer.
- Prezzo di mercato: Variable, generally moderate to high depending on region and demand.
- Importanza commerciale: medium
- Sapore: Mild, delicate, slightly sweet.
- Consistenza: Firm, flaky, cartilaginous.
- Metodi di cottura: Fried, Baked, Grilled, Poached, Stewed
- Valore nutrizionale: Good source of protein, low in fat, contains omega-3 fatty acids.
Fatti chiave
Starry Skininteresting
The common name 'Starry Ray' comes from the numerous small, star-shaped dermal denticles (spines) that cover its dorsal surface, giving it a rough, sandpaper-like texture.
Egg Casesbehavior
Like other skates, Raja asterias is oviparous, laying distinctive rectangular egg cases, often called 'mermaid's purses,' which are typically dark brown or black with long, coiled tendrils at each corner that anchor them to the seabed.
Mediterranean Endemicinteresting
While found in adjacent Atlantic waters, Raja asterias is considered a characteristic species of the Mediterranean Sea, where it is relatively common in suitable habitats.
Dietary Generalistbehavior
This ray is an opportunistic predator, feeding on a variety of benthic invertebrates such as crustaceans (crabs, shrimp), mollusks, and small bottom-dwelling fish, using its flattened body to ambush prey on the seabed.
Sexual Dimorphism in Thornsbehavior
Adult female Raja asterias tend to have more prominent and numerous thorns along the midline of their disc and tail compared to males, a feature that can sometimes aid in sex identification.
Informazioni di sicurezza
Maneggiare con cura- Livello di sicurezza: caution
- Velenoso: No
- Commestibilità: edible
- Note sul maneggio: While not venomous, Raja asterias possesses numerous sharp thorns and stellate denticles on its dorsal surface and tail. Care should be taken when handling to avoid cuts and punctures. Use thick gloves and handle by the disc, avoiding direct contact with the thorny areas. They are generally docile but can thrash when caught.
Specie simili
Thornback Ray
Raja clavata
Raja clavata has much larger, more prominent thorns, especially along the midline and margins of the disc, and lacks the widespread, fine stellate denticles of Raja asterias. The disc of R. clavata is also typically more rounded anteriorly.
Brown Ray
Raja miraletus
Raja miraletus typically has one or two prominent ocelli (eye-spots) on the dorsal surface of each pectoral fin, which are absent in Raja asterias. The dorsal surface of R. miraletus is also smoother, with fewer and less prominent denticles.
Small-eyed Ray
Raja microocellata
Raja microocellata has a much smoother dorsal surface with very few, if any, large thorns or stellate denticles. Its eyes are also notably smaller relative to its head size compared to Raja asterias.
Classificazione scientifica
- Regno
- Animalia
- Phylum
- Chordata
- Classe
- Chondrichthyes
- Ordine
- Rajiformes
- Famiglia
- Rajidae
- Genere
- Raja
- Specie
- Raja asterias
Esplora Starry Ray
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