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Platyrhina sinensis, commonly known as the Fanray, is a species of ray belonging to the family Platyrhinidae. It is characterized by its distinctive heart-shaped disc, a relatively long and robust tail, and a dorsal surface covered in numerous small denticles and larger thorns. This benthic species is found in coastal waters of the Indo-West Pacific, typically inhabiting sandy or muddy substrates where it preys on small invertebrates and fishes. It is a relatively small ray, generally not exceeding 60 cm in total length.
Physical Characteristics
- Body shape
- flat
- Coloration
- Dorsal surface typically light brown to grayish-brown, often with scattered darker spots or blotches, providing camouflage against the seabed. Ventral surface is white or cream-colored.
- Scale type
- none
- Mouth position
- inferior
- Distinctive features
- Heart-shaped disc, wider than long., Two prominent dorsal fins located on the tail., A caudal fin (tail fin) that is well-developed and fan-like., Dorsal surface covered in numerous small dermal denticles, giving it a rough texture., Several rows of larger, sharp thorns along the midline of the back and tail, and often around the eyes and shoulders.
- Dorsal fin
- Two distinct, relatively large dorsal fins located on the posterior half of the tail, close to the caudal fin.
- Tail fin
- Well-developed, fan-like caudal fin, continuous with the dorsal fins.
- Pectoral fin
- Broad, rounded pectoral fins forming the heart-shaped disc.
- Distinctive fins
- Pelvic fins are separate from the pectoral fins and are relatively small.
Identification Tips
Disc Shape
Look for the characteristic heart-shaped or spade-shaped disc, which is wider than it is long.
Dorsal Fins
Note the two distinct dorsal fins positioned on the tail, followed by a prominent caudal fin.
Thorns/Denticles
Feel (carefully) or observe the rough texture of the dorsal surface due to numerous small denticles, and the presence of larger, sharp thorns along the midline and around the eyes.
Coloration
Observe the cryptic brown to grayish-brown coloration, often with darker spots, which helps it blend with the seabed.
Habitat
- Water type
- saltwater
- Depth
- Typically found in shallow coastal waters, from the intertidal zone down to about 100 meters (330 feet), though most commonly observed in less than 50 meters.
- Environment
- Benthic, inhabiting sandy or muddy bottoms, often near rocky reefs or seagrass beds. Prefers soft substrates for burrowing.
- Geographic range
- Indo-West Pacific, including the coasts of China, Korea, Japan, Taiwan, and potentially extending to parts of Southeast Asia.
Aquarium Information
- Care level: expert
- Temperament: peaceful
- Diet: carnivore
- Minimum tank size: 750 gallons (2839 liters)
- Temperature: 20-24°C (68-75°F)
- pH level: 8.1-8.4
- Hardness: 8-12 dKH
- Compatibility: Best kept in a species-specific tank or with very large, peaceful, non-aggressive fish that will not outcompete it for food or disturb its benthic lifestyle. Avoid aggressive or fin-nipping species.
- Special requirements: Requires a very large tank with a soft, deep sand bed (at least 10-15 cm) for burrowing. Excellent filtration and stable water parameters are crucial. Dim lighting is preferred. Live or frozen meaty foods are essential. Not suitable for most home aquariums due to size requirements and specialized care.
Wild Information
- Conservation status: vulnerable
- Seasonality: No specific seasonal migrations are well-documented; generally present year-round in its habitat, though fishing pressure may vary seasonally.
- Market price: Low to moderate, primarily for local consumption or bycatch.
- Commercial importance: low
- Taste: Mild, slightly sweet.
- Texture: Firm, flaky.
- Cooking methods: Fried, Steamed, Grilled, Curried
- Nutritional value: Good source of protein and omega-3 fatty acids.
Key Facts
Ancient Lineageevolution
Rays, including the Fanray, belong to the superorder Batoidea, which represents an ancient lineage of cartilaginous fishes that diverged from sharks millions of years ago.
Benthic Lifestylebehavior
The Fanray's flattened body and cryptic coloration are perfect adaptations for its benthic lifestyle, allowing it to effectively camouflage itself on the seabed to ambush prey and avoid predators.
Unique Familyinteresting
Platyrhina sinensis belongs to the family Platyrhinidae, which is a small family of rays sometimes referred to as 'fanrays' or 'thornback rays' due to their distinctive features.
Sensory Perceptionbehavior
Like other rays, Fanrays possess ampullae of Lorenzini, specialized electroreceptors that allow them to detect the weak electrical fields produced by prey buried in the sand.
Safety Information
Handle with care- Safety level: caution
- Venomous: No
- Edibility: edible
- Handling notes: While not venomous, Fanrays possess sharp thorns along their back and tail. Care should be taken when handling to avoid cuts or punctures. They are generally docile but may thrash if threatened or caught, potentially causing injury with their thorns. Always handle with thick gloves if necessary, and release quickly and carefully if caught incidentally.
Similar Species
Thornback Ray
Raja clavata
While also having thorns, Raja clavata has a more rhomboidal disc shape and a more pointed snout. Its thorns are typically more numerous and larger, especially on the disc, and it lacks the distinct fan-like caudal fin of Platyrhina sinensis.
Other Platyrhina species
Platyrhina tangi, Platyrhina limboonkengi
Differentiation from other Platyrhina species often requires careful examination of thorn patterns, disc proportions, and coloration details, which can be subtle. P. sinensis generally has a more pronounced heart-shape and specific thorn arrangements compared to its congeners.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Chondrichthyes
- Order
- Rhinopristiformes
- Family
- Platyrhinidae
- Genus
- Platyrhina
- Species
- P. sinensis
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