Got a photo? Identify fish instantly with the Fishby app.
Open the appDescription
The Thornback Skate (Dentiraja lemprieri) is a species of skate belonging to the family Rajidae. It is characterized by its flattened, rhomboidal body and numerous thorns (denticles) on its dorsal surface, particularly along the midline and around the eyes. This species is endemic to the temperate waters of southern Australia, inhabiting continental shelf and upper slope environments. It is a benthic predator, feeding primarily on small crustaceans and fish. While not a major commercial target, it is occasionally caught as bycatch in trawl fisheries.
Physical Characteristics
- Body shape
- flat
- Coloration
- Dorsal surface typically light brown to grey, often with darker spots or blotches, providing camouflage against the seabed. Ventral surface is white or pale.
- Scale type
- placoid
- Mouth position
- inferior
- Distinctive features
- Rhomboidal disc, slightly wider than long., Snout is short and blunt., Numerous prominent thorns (denticles) on the dorsal surface, particularly along the midline from the nape to the tail, around the eyes, and on the pectoral fins., Two small dorsal fins located close to the tip of the tail., Absence of a caudal fin (tail fin).
- Dorsal fin
- Two small, similarly sized dorsal fins located on the posterior part of the tail, close to the tip.
- Tail fin
- Reduced to a fleshy fold, no true caudal fin.
- Pectoral fin
- Large, wing-like, forming the main body disc.
- Distinctive fins
- Pelvic fins are bilobed, with the anterior lobe distinctly separated from the posterior lobe.
Identification Tips
Thorns
The most distinguishing feature is the presence of numerous, prominent thorns (denticles) scattered across the dorsal surface, especially along the midline and around the eyes. This differentiates it from many other smooth-bodied skate species.
Snout Shape
Possesses a relatively short and blunt snout, contrasting with the more pointed snouts of some other skate species.
Dorsal Fins
Two small dorsal fins are located very close to the tip of the tail, with no caudal fin present.
Pelvic Fins
The bilobed pelvic fins, with a distinct separation between the anterior and posterior lobes, are a key diagnostic feature for the genus Dentiraja.
Habitat
- Water type
- saltwater
- Depth
- Typically found in depths ranging from 10 to 200 meters, occasionally deeper.
- Environment
- Benthic, inhabiting sandy, muddy, or gravelly substrates on the continental shelf and upper slope. Prefers soft bottoms where it can bury itself.
- Geographic range
- Endemic to southern Australia, from Western Australia (south of Perth) across to Tasmania and Victoria, extending northwards to southern New South Wales.
Aquarium Information
- Care level: expert
- Temperament: peaceful
- Diet: carnivore
- Minimum tank size: Not suitable for home aquaria due to size and specialized needs.
- Temperature: 10-18°C (50-64°F)
- pH level: 7.8-8.4
- Hardness: High (marine salinity)
- Compatibility: Not suitable for mixed-species aquaria due to specialized needs and potential for stress in captive environments.
- Special requirements: Requires extremely large, specialized public aquarium facilities with excellent filtration, sand substrate for burying, and a constant supply of live or fresh frozen marine prey. Not recommended for private aquarists.
Wild Information
- Conservation status: least concern
- Seasonality: No distinct seasonal migration patterns are well-documented; present year-round within its range.
- Market price: N/A (not commercially targeted)
- Commercial importance: low
- Taste: Mild, slightly sweet
- Texture: Firm, flaky
- Cooking methods: Fried, Baked, Grilled
- Nutritional value: Good source of protein and omega-3 fatty acids, though not commonly consumed.
Key Facts
Ancient Lineageevolution
Skates, including the Thornback Skate, belong to an ancient group of cartilaginous fishes (Chondrichthyes) that have existed for millions of years, predating most bony fish.
Egg Casesbehavior
Like all skates, the Thornback Skate lays distinctive leathery egg cases, often called 'mermaid's purses,' which are typically rectangular with horn-like projections at each corner. These are often found washed up on beaches.
Benthic Lifestylebehavior
Thornback Skates are perfectly adapted for a life on the seabed, with their flattened bodies allowing them to lie camouflaged against the substrate, ambushing prey or avoiding predators.
Sensory Poresinteresting
Their ventral surface is covered in numerous pores that house electroreceptors (Ampullae of Lorenzini), allowing them to detect the faint electrical fields produced by prey buried in the sand.
Safety Information
Handle with care- Safety level: caution
- Venomous: No
- Edibility: edible
- Handling notes: Thornback skates possess numerous sharp thorns (denticles) on their dorsal surface. While not venomous, these thorns can cause painful punctures and abrasions if handled carelessly. Anglers should exercise caution when unhooking or releasing these fish, using thick gloves and appropriate tools to avoid injury. Always support the disc and tail when handling to minimize stress to the animal.
Similar Species
Southern Shovelnose Ray
Aptychotrema rostrata
While also having a flattened body and inhabiting similar areas, the Southern Shovelnose Ray has a more elongated, shovel-like snout and a distinct caudal fin, unlike the Thornback Skate's blunt snout and absent caudal fin.
Fiddler Ray
Trygonorrhina fasciata
Fiddler rays have a more guitar-shaped body, a more pointed snout, and often distinct color patterns (e.g., bands or spots) that differ from the Thornback Skate's more uniform coloration and rhomboidal disc.
Other Dentiraja species
Various
Distinguishing D. lemprieri from other Dentiraja species (e.g., D. cerva, D. flindersi) often requires careful examination of thorn patterns, disc shape ratios, and clasper morphology in males. D. lemprieri generally has a more densely thorny dorsal surface compared to some congeners.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Chondrichthyes
- Order
- Rajiformes
- Family
- Rajidae
- Genus
- Dentiraja
- Species
- lemprieri
Explore Thornback Skate
Identify fish anywhere
Free on iOS, Android, and Web. Photo identification, full species details, and more.