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Myliobatis aquila, commonly known as the Common Eagle Ray, is a large cartilaginous fish belonging to the family Myliobatidae. It is characterized by its distinctive diamond-shaped disc, long whip-like tail, and prominent head with a duck-bill-like snout. These rays are powerful swimmers, often seen gliding gracefully through the water column, sometimes leaping out of the water. They are benthic feeders, primarily preying on mollusks and crustaceans, which they crush with their specialized dental plates.
Physical Characteristics
- Body shape
- flat
- Coloration
- Dorsal surface typically dark brown, grey, or black, sometimes with faint lighter spots or reticulations. Ventral surface is white or off-white.
- Scale type
- none
- Mouth position
- inferior
- Distinctive features
- Diamond-shaped disc, wider than long., Long, whip-like tail with one or more venomous spines located near the base., Distinctive head with a prominent, rounded snout resembling a duck's bill., Eyes and spiracles located on the sides of the head., Pectoral fins are large and wing-like, giving it an 'eagle-like' appearance in water.
- Dorsal fin
- Small, single dorsal fin located at the base of the tail, just anterior to the spine(s).
- Tail fin
- Very long, slender, whip-like tail, significantly longer than the disc, bearing one to five serrated venomous spines.
- Pectoral fin
- Large, wing-like pectoral fins that form the main body disc.
- Distinctive fins
- Pelvic fins are small and located beneath the disc, posterior to the pectoral fins.
Identification Tips
Disc Shape
Look for the broad, diamond-shaped disc with pointed pectoral fin tips. The disc is typically wider than it is long.
Head and Snout
Observe the distinct, prominent head that protrudes from the disc, ending in a rounded, duck-bill-like snout. The eyes are on the sides of the head, not on top.
Tail and Spines
Note the very long, whip-like tail, which is significantly longer than the body disc. One to five venomous spines are located at the base of the tail, just behind the small dorsal fin.
Coloration
The dorsal surface is uniformly dark (brown, grey, or black), lacking the prominent white spots or rings seen in some other eagle ray species.
Swimming Behavior
Often seen swimming gracefully with powerful, undulating movements of its pectoral fins, resembling a bird in flight. May also leap out of the water.
Habitat
- Water type
- saltwater
- Depth
- Typically found in coastal waters from the surface down to about 300 meters (984 feet), but most commonly in shallower waters (10-100 meters).
- Environment
- Prefers sandy or muddy bottoms in coastal areas, estuaries, and bays. Also found over seagrass beds and rocky reefs. Often observed in open water, sometimes near the surface.
- Geographic range
- Eastern Atlantic Ocean, including the Mediterranean Sea, Black Sea, and along the coasts of Africa from Mauritania to South Africa. Also found in the Indian Ocean off the coast of South Africa.
Aquarium Information
- Care level: expert
- Temperament: peaceful
- Diet: carnivore
- Minimum tank size: Not suitable for home aquaria; requires extremely large public aquarium exhibits due to size and active swimming habits.
- Temperature: 18-24°C (64-75°F)
- pH level: 8.1-8.4
- Hardness: High (marine salinity)
- Compatibility: Generally peaceful with other large, non-aggressive marine species. Not suitable for reef tanks due to potential predation on invertebrates.
- Special requirements: Requires vast open swimming space, excellent filtration, and a diet of appropriate benthic invertebrates. Not recommended for private aquarists.
Wild Information
- Conservation status: near threatened
- Seasonality: Present year-round in suitable habitats, but may exhibit seasonal movements related to breeding or food availability.
- Market price: Variable, generally low due to conservation concerns and specific market demand.
- Commercial importance: low
- Taste: Mild, slightly sweet, often compared to scallops or swordfish.
- Texture: Firm, meaty, flaky.
- Cooking methods: Grilled, Fried, Baked, Steamed
- Nutritional value: Good source of protein, low in fat. Specific nutritional data can vary.
Key Facts
Leaping Acrobaticsbehavior
Eagle Rays are known for their spectacular leaps out of the water, sometimes reaching several feet into the air. The exact reason for this behavior is not fully understood but is thought to be related to evading predators, dislodging parasites, or courtship displays.
Specialized Dentitioninteresting
Unlike many fish with pointed teeth, Eagle Rays possess flattened, hexagonal dental plates arranged in pavement-like rows. These specialized teeth are perfectly adapted for crushing the shells of their mollusk and crustacean prey.
Viviparous Reproductionbehavior
Myliobatis aquila is ovoviviparous, meaning the embryos develop inside eggs within the mother's body, hatching internally, and then live young are born. The young are nourished by a 'uterine milk' secreted by the mother.
Ancient Lineageevolution
Rays, including eagle rays, belong to the superorder Batoidea, which are among the oldest groups of cartilaginous fish, with a fossil record extending back to the Jurassic period.
Safety Information
Venomous- Safety level: venomous
- Venomous: Yes
- Edibility: edible
- Handling notes: Extreme caution is advised when handling Eagle Rays due to the presence of one or more venomous, serrated spines at the base of the tail. These spines can inflict painful wounds and introduce venom, which can cause severe pain, swelling, and in rare cases, systemic effects. If stung, seek immediate medical attention. Do not attempt to remove the spine if it is deeply embedded. Avoid direct contact with the tail.
Similar Species
Spotted Eagle Ray
Aetobatus narinari
The Spotted Eagle Ray has numerous distinct white spots on its dorsal surface, a more pointed snout, and a more pronounced head distinct from the disc. Myliobatis aquila typically lacks these spots and has a blunter, duck-bill-like snout.
Common Stingray
Dasyatis pastinaca
Common Stingrays have a more rounded or rhomboidal disc, a shorter, thicker tail, and lack the prominent, distinct head and duck-bill snout characteristic of Myliobatis aquila. Their eyes are typically more dorsally placed.
Bull Ray
Myliobatis aquila (often used as an alternative common name, but can cause confusion with other Myliobatis species)
This is often a synonym for Myliobatis aquila. However, other Myliobatis species exist (e.g., Myliobatis californica - Bat Ray), which can be differentiated by geographic range, specific disc shape, and snout morphology.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Chondrichthyes
- Order
- Myliobatiformes
- Family
- Myliobatidae
- Genus
- Myliobatis
- Species
- Myliobatis aquila
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