Amblyraja radiata
Amblyraja radiata·Large·Oviparous·Species of Concern (U.S. National Marine Fisheries Service)
The thorny skate (*Amblyraja radiata*) is a species of fish belonging to the Rajidae family, characterized by its rough upper body covered in numerous small thorns and larger ones along its back. This bottom-dwelling skate inhabits the North and southeastern Atlantic Ocean, preferring muddy and sandy substrates in deep waters.
Key Facts
- ›Reaches up to 1.05 meters in length and 11.4 kg in weight.
- ›Possesses a rough upper body with many small thorns and 13-17 larger ones.
- ›Males have alar thorns, while the species lacks interdorsal thorns.
- ›Found in the North and southeastern Atlantic Ocean at depths between 25 to 1,400 meters.
- ›Feeds on crustaceans, small fishes, and worms.
- ›Is oviparous, producing 10-45 egg capsules annually, with incubation potentially taking up to 36 months.
Thorny Skate
North Atlantic Ocean, Southeastern Atlantic Ocean
- Up To 1.05 M Total Length
- Up To 11.4 Kg Weight
- Rough Upper Side With Many Small Thorns
- 13-17 Larger Thorns In A Line From Head To Tail
- Males Have Alar Thorns
- Lacks Interdorsal Thorns
- Upper Jaw Teeth Rows: 38-40
- Lower Jaw Teeth Rows: 38-40
- Brown Coloration With Possible Black Spots On Top
- White Underside
- Hard, Roughly Triangular Snout
- Tail Shorter Than Body
Carnivore, Piscivore
- Dense Covering of Small Thorns On Upper Body
- Prominent Row of Larger Thorns Along the Dorsal Midline
- Presence of Alar Thorns In Males
About Amblyraja radiata
Thorny Skate (Amblyraja radiata)
The thorny skate, scientifically known as Amblyraja radiata, is a species of cartilaginous fish belonging to the Rajidae family. This bottom-dwelling species is characterized by its rough upper body, which is densely covered in numerous small thorns, supplemented by 13 to 17 larger thorns arranged in a line from the back of its head to the end of its tail. Males of the species possess distinctive alar thorns, while the thorny skate notably lacks any interdorsal thorns. Its coloration is typically brown with potential black spots on its upper side, contrasting with a white underside. The thorny skate features a hard, triangular snout and a tail that is shorter than its body.
Distribution and Habitat
This skate inhabits the North and southeastern Atlantic Ocean. It is found over muddy and sandy substrates, typically at depths ranging from 25 to 1,400 meters (82–4,593 ft), though it most commonly occurs between 27 and 439 meters (89–1,440 ft). The water temperature in its habitat ranges from -1 to 14 °C (30–57 °F).
Diet and Reproduction
The thorny skate's diet consists of crustaceans, small fishes, and worms. It is an oviparous species, meaning it lays eggs. Females are capable of producing 10 to 45 egg capsules annually, each measuring between 3–8 cm in length and 2.5–6 cm in width. These capsules hatch outside the body, and the incubation period can be lengthy, potentially taking up to 36 months in higher latitude regions. Newly hatched thorny skates measure between 8 and 12 centimeters in total length.
Conservation Status
The thorny skate is recognized as a species of concern by the U.S. National Marine Fisheries Service due to concerns about its status and threats. However, there is currently insufficient information to list it under the U.S. Endangered Species Act. The species is also incidentally caught as bycatch in various fisheries.
Source: Wikipedia ↗
Frequently Asked Questions
What is the thorny skate's average size?
The thorny skate can grow to a total length of up to 1.05 meters (3.4 ft) and weigh as much as 11.4 kg (25 lb). Juveniles at birth typically measure between 8 to 12 centimeters (3.1 to 4.7 in) in length.
Where does the thorny skate live?
This species is found in the North and southeastern Atlantic Ocean. It inhabits the seabed, primarily over muddy and sandy substrates, at depths ranging from 25 to 1,400 meters.
What distinguishes the thorny skate from other skates?
The thorny skate is named for its rough upper body, which is covered in numerous small thorns and 13-17 larger ones running from the back of its head to the tail. Males also possess distinctive alar thorns.
What does the thorny skate eat?
The diet of the thorny skate consists of a variety of marine life. It primarily consumes crustaceans, small fishes, and worms found on the ocean floor.
How does the thorny skate reproduce?
The thorny skate is oviparous, meaning it lays eggs. Females can produce between 10 and 45 egg capsules each year, which are then laid and develop outside the body. Incubation can be prolonged, taking up to 36 months in higher latitude regions.
What is the conservation status of the thorny skate?
The thorny skate is considered a species of concern by the U.S. National Marine Fisheries Service. While there are concerns about its status and threats, there is insufficient information to warrant listing it under the U.S. Endangered Species Act. It is also caught as bycatch in some fisheries.
Related Cartilaginous fish species
Amblyraja hyperborea
The Arctic skate (Amblyraja hyperborea) is a species of ray found near the seabed in cold waters of the Arctic Ocean, surrounding Canada and northern Europe, the northern Pacific, and waters around Antarctica and New Zealand. It is characterized by its gray-brown coloration with large dark spots on its dorsal side, a white underside with dark patterns, and thorns along its back to its tail. This oviparous species feeds on small bottom-dwelling animals.
Amblyraja jenseni
Amblyraja jenseni, also known as Jensen's skate or the shorttail skate, is a rare, medium-sized deep-sea skate found in the North Atlantic Ocean. It is distinguished by its chocolate-brown to gray coloration, with specimens varying in size and marking depending on their specific location within its wide distribution. This species inhabits very deep marine environments and feeds on a diet of fish, cephalopods, and crustaceans.
Amblyraja badia
The broad skate (Amblyraja badia) is a poorly understood species of skate found in the deep Pacific Ocean, ranging from the Gulf of Panama to the Bering Sea and off Japan. Known for its broad, flat pectoral disc, prickly dorsal surface, and distinctive thorn arrangements, it inhabits depths between approximately 846 and 3,167 meters, making it one of the deepest-dwelling skates.