Amblyraja jenseni
Amblyraja jenseni·Medium·Oviparous·Least Concern
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.
Key Facts
- ›Amblyraja jenseni is a medium-sized skate found in the North Atlantic Ocean.
- ›It exhibits variable coloration, with individuals described as either light or dark varieties.
- ›The species inhabits very deep marine environments, with specimens recorded at depths up to 1996 meters.
- ›Jensen's skate is oviparous, laying large, purse-like egg cases.
- ›It feeds on fish, cephalopods, and decapod crustaceans, playing a role similar to higher predators.
- ›As of 2019, it was listed as Least Concern by the IUCN Shark Specialist Group.
Jensen's Skate, Shorttail Skate
Order: Rajiformes, Family: Rajidae, Genus: Amblyraja
North-East Atlantic Ocean, North-West Atlantic Ocean, Mid-Atlantic Ridge
- Medium-Sized Skate
- Disc About 1.35 Times As Wide As It Is Long
- Rounded Snout Tip That Does Not Project
- Coloration Varies From Chocolate-Brown To Gray, With Light and Dark Varieties
- Dorsal Side Has Dark Edges On Wings, Dark Spots On Disc, and Alternating Light/Dark Bands On Tail
- Ventral Side Is Typically Dark With Lighter Areas Around Mouth, Snout, Nostrils, Gills, Abdomen, Claspers, and Pelvic Fins
- Prickly Scales On Dorsal Side In Patches and Belts On the Tail
- Smooth On Posterior Margins of Pectorals and Ventral Side of Disc and Tail
- Females Are Larger Than Males
- Male Claspers Are Copulative Organs
Carnivore, Piscivore
- Benthic-Benthopelagic Lifestyle
- Males Use Claspers and Hook-Shaped Organs For Copulation
- Possesses 56-66 Series of Teeth, More Than the Closely Related Amblyraja Hyperborea
- Lacks Thorns On Anterior Margins and Mid-Posterior Portions of Pectorals, and Near the Mid-Dorsal Line On the Disc Behind the Nuchal Region
About Amblyraja jenseni
Jensen's skate, scientifically known as Amblyraja jenseni and also referred to as the shorttail skate, is a rare species of deep-sea cartilaginous fish inhabiting the North Atlantic Ocean. Named in honor of Danish zoologist Adolf Severin Jensen, this medium-sized skate is characterized by its variable coloration, ranging from chocolate-brown to gray, with distinct light and dark morphs observed in different regions.
Distribution and Habitat
This benthic-benthopelagic species is found in three primary regions of the North Atlantic: the North-East Atlantic, the North-West Atlantic, and along the Mid-Atlantic Ridge. Jensen's skate inhabits very deep marine environments, with recorded depths ranging from a mean of 864 meters in the Northwest Atlantic to as deep as 1996 meters on the Mid-Atlantic Ridge. The waters it occupies in the North-East Atlantic have mean temperatures between -0.1–6.9 °C.
Physical Characteristics and Diet
Amblyraja jenseni possesses a disc shape approximately 1.35 times as wide as it is long, with a rounded snout tip. Its dorsal surface is covered in prickly scales, while the ventral side is generally smooth. Sexual dimorphism is present, with females typically being larger than males and exhibiting differences in gill slit length and thorn counts. The species' diet is composed of fish, cephalopods, and decapod crustaceans, fulfilling an ecological role similar to higher predators in its deep-sea ecosystem.
Reproduction and Conservation
Jensen's skate is oviparous, meaning females lay large, purse-like egg cases. While specific reproductive seasons are not well-documented, related species suggest year-round fertility with potential seasonal peaks. As of 2019, Amblyraja jenseni was classified as Least Concern by the IUCN Shark Specialist Group. It is not a species of significant cultural or commercial importance, and its capture is primarily limited to scientific research purposes.
Source: Wikipedia ↗
Frequently Asked Questions
What is Amblyraja jenseni?
Amblyraja jenseni is a species of deep-sea skate, also commonly known as Jensen's skate or the shorttail skate. It is a cartilaginous fish found in the North Atlantic Ocean.
Where does Jensen's skate live?
Jensen's skate is found in the North Atlantic Ocean, with known ranges including waters off the coast of North America, Greenland, and west of the British Isles. It inhabits very deep marine environments.
What does Jensen's skate eat?
The diet of Amblyraja jenseni consists of fish, cephalopods, and decapod crustaceans. This feeding habit places it in a similar ecological role to higher predators in its deep-sea habitat.
How does Jensen's skate reproduce?
Jensen's skate is oviparous, meaning females lay egg cases rather than giving live birth. These egg cases, known as purses, are large and are developed within the female's uterus before being laid.
What is the conservation status of Amblyraja jenseni?
As of 2019, Jensen's skate was classified as Least Concern by the IUCN Shark Specialist Group. It is not significantly affected by human activities and is rarely caught except for scientific research.
What are the distinguishing features of Jensen's skate?
Amblyraja jenseni is characterized by its chocolate-brown to gray coloration, with some specimens exhibiting light or dark variations. It is a medium-sized skate, and its disc shape is notably wider than it is long. It differs from similar species like Amblyraja hyperborea by having more teeth series.
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 radiata
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.
Amblyraja doellojuradoi
The southern thorny skate (Amblyraja doellojuradoi) is a species of fish belonging to the Rajidae family, inhabiting the southern Atlantic Ocean. It is primarily found off the coasts of Argentina, Uruguay, and the Falkland Islands, typically at depths between 51 and 642 meters. This skate is distinguished by its maximum size of 69 cm and its habit of laying oblong egg capsules with horn-like projections.