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Malacoraja microocellata, commonly known as the Small-eyed Ray, is a species of skate belonging to the family Rajidae. It is characterized by its relatively small eyes compared to other skate species, a smooth dorsal surface in adults, and a distinctive coloration. This species is demersal, inhabiting sandy or muddy substrates.
Physical Characteristics
- Body shape
- compressed
- Coloration
- Dorsal surface typically light brown to greyish-brown, often with scattered small, dark spots or blotches. Ventral surface is white, sometimes with dusky margins. The eyes are notably small relative to the head size.
- Scale type
- placoid
- Mouth position
- inferior
- Distinctive features
- Small eyes, Smooth dorsal disc in adults (juveniles may have some thorns), Relatively short, stout tail with two small dorsal fins near the tip, Absence of a prominent thorn row along the midline of the disc in adults
- Dorsal fin
- Two small dorsal fins located close to the tip of the tail.
- Tail fin
- Short and stout, with a small caudal fin fold.
- Pectoral fin
- Large, wing-like pectoral fins forming the disc.
- Distinctive fins
- Pelvic fins are bilobed.
Identification Tips
Eye Size
The most distinguishing feature is its small eyes relative to the head size, which gives it its common name. This is a key differentiator from other sympatric skate species.
Dorsal Thorns
Adults are largely smooth-bodied dorsally, lacking the prominent rows of thorns found in many other skates. Juveniles may have some scattered thorns, particularly along the midline and around the eyes, but these are lost with age.
Coloration
The generally uniform light brown to greyish-brown dorsal coloration, often with subtle darker spots, helps distinguish it from more heavily patterned skates.
Tail
The relatively short and stout tail, bearing two small dorsal fins near its tip, is also characteristic.
Habitat
- Water type
- saltwater
- Depth
- Typically found at depths ranging from 20 to 200 meters, though occasionally recorded deeper (up to 400m).
- Environment
- Demersal, inhabiting continental shelf and upper slope.
- Geographic range
- Northeastern Atlantic Ocean, from the British Isles (especially the Irish Sea and English Channel) south to Morocco, including the Bay of Biscay. Also found in the Mediterranean Sea, though less common there.
Aquarium Information
- Care level: expert
- Temperament: peaceful
- Diet: carnivore
- Minimum tank size: Not suitable for home aquaria due to size and specialized needs.
- Temperature: 8-12°C (46-54°F)
- pH level: 7.8-8.4
- Hardness: Not applicable for home aquaria
- Compatibility: Not applicable for home aquaria
- Special requirements: Requires very large, specialized public aquarium facilities with appropriate substrate, water flow, and temperature regulation. Not recommended for private aquarists.
Wild Information
- Conservation status: near threatened
- Seasonality: No significant seasonal migrations for reproduction; generally present year-round in suitable habitats. Spawning occurs over an extended period, typically from spring to autumn.
- Market price: Low to moderate, often caught as bycatch.
- Commercial importance: none
- Taste: Mild, firm white flesh, similar to other skates.
- Texture: Firm, flaky
- Cooking methods: Fried, Baked, Grilled
- Nutritional value: Good source of protein, low in fat.
Key Facts
Diet and Feeding Habitsbehavior
Primarily a benthic feeder, preying on small crustaceans (e.g., crabs, shrimp), polychaete worms, and small bottom-dwelling fish. It uses its flattened body to ambush prey on the seabed.
Reproductionrecord
Oviparous, laying rectangular egg cases (mermaid's purses) with horn-like projections at each corner. These egg cases are deposited on sandy or muddy substrates. Females can lay multiple egg cases over an extended period.
Ecological Rolebehavior
As a benthic predator, it plays a role in controlling populations of invertebrates and small fish on the seabed. It also serves as a food source for larger predators such as sharks and marine mammals.
Conservation Statusrecord
Currently listed as 'Near Threatened' by the IUCN. This is primarily due to bycatch in demersal trawl fisheries, habitat degradation, and its relatively slow reproductive rate, which makes it vulnerable to overfishing.
Taxonomic Notesrecord
Previously classified under the genus Raja. Recent molecular and morphological studies have supported its placement in the genus Malacoraja, distinguishing it from other skates based on specific anatomical features and genetic divergence. No major recent taxonomic changes beyond this genus reclassification.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: edible
- Handling notes: Small-eyed Rays are not venomous and do not possess stinging spines. However, like all skates, they have a rough, sandpaper-like skin due to placoid scales. Handle with care to avoid abrasions. If caught, release gently to minimize stress and injury.
Similar Species
Thornback Ray (Raja clavata)
Raja clavata
Possesses numerous large, prominent thorns on both the dorsal and ventral surfaces, especially along the midline and margins of the disc. Eyes are proportionally larger.
Spotted Ray (Raja montagui)
Raja montagui
Characterized by numerous distinct dark spots on the dorsal surface. Eyes are proportionally larger, and it typically has a row of thorns along the midline of the tail.
Cuckoo Ray (Leucoraja naevus)
Leucoraja naevus
Distinguished by a prominent ocellated spot (eye-spot) on each pectoral fin. Eyes are proportionally larger, and it has a more pointed snout.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Chondrichthyes
- Order
- Rajiformes
- Family
- Rajidae
- Genus
- Malacoraja
- Species
- Malacoraja microocellata
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