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Rough ray (Raja radula) — Rajidae

Rough ray

Raja radula
Family: Rajidae
EN · Endangered

The Rough ray (Raja radula) is a saltwater fish of the family Rajidae that grows up to 70 cm.

Length
70 cm
Water
Saltwater
Depth
0–300.0 m
Diet
Carnivore
Behaviour
Solitary
Activity
Nocturnal
Body shape
Flat / disc-shaped
Substrate
Sand / mud bottom
Danger
Harmless
Range
Endemic to the Mediterranean Sea, mainly the eastern and southern part, over sandy and silty bottoms of the continental shelf.
Edibility
Commonly eaten

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Description

The rough ray is a diamond-shaped ray of the family Rajidae (true skates) reaching a disc width of about 70 cm. The upper side is brown with fine mottling and feels rough like a rasp due to its densely set granular skin denticles - hence the name 'radula'. Rows of thorns run over the back and tail, but unlike stingrays it lacks a venomous spine. The species is endemic to the Mediterranean and lives on sand and mud bottoms of the continental shelf. On the bottom it hunts crabs, shrimps, crustaceans and small fish. It is egg-laying. Through fishing pressure and bycatch it has declined and is assessed as Endangered (EN).

Frequently asked questions

How do you recognise the Rough ray?

The Rough ray has a flattened, disc-shaped body, is mainly brown and shows a spots pattern. Diamond-shaped ray with granular, rough dorsal skin (hence 'radula') and rows of small thorns; no venomous spine.

Where does the Rough ray live?

The Rough ray lives in the sea (marine waters) and is mostly found around sand or mud bottom. Endemic to the Mediterranean Sea, mainly the eastern and southern part, over sandy and silty bottoms of the continental shelf.

How big does the Rough ray get?

The Rough ray grows to a maximum of about 70 cm.

Is the Rough ray dangerous to humans?

No, the Rough ray is harmless to humans. Unlike stingrays this skate has no venomous tail spine and is harmless; the rough skin and thorns can abrade, however.

Is the Rough ray edible?

Yes, the Rough ray is commonly eaten.

More photos

Rough ray (Raja radula) — Rajidae — 2
mmissoum (CC BY-NC 4.0) via GBIF — iNaturalist
Rough ray (Raja radula) — Rajidae — 3
ahmed_garah (CC BY-NC 4.0) via GBIF — iNaturalist
Rough ray (Raja radula) — Rajidae — 4
Wikimedia Commons — Chris Taklis (CC BY 4.0)
Rough ray (Raja radula) — Rajidae — 5
Wikimedia Commons — Müller & Henle (Public domain)

Easily confused with

These species look like the Rough ray and live in the same waters.

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All data

Identification

English name
Rough ray verified
Scientific name
Raja radula
Family
Rajidae
Other names
Rough ray; Rough skate verified

Appearance

Size class
Large verified
Max length (cm)
70.0 verified
Body shape
Flat / disc-shaped verified
Dominant colour
Brown sourced
Pattern
Spots sourced
Tail shape
Straight inferred
Mouth position
Inferior (downward) inferred
Lips
Thin inferred
Barbels
No verified
Dorsal fins
Two separate sourced
Dorsal spines
No verified

Habitat & distribution

Water type
Saltwater verified
Substrate
Sand / mud bottom verified
Max depth (m)
300.0 verified
Natural range
Endemic to the Mediterranean Sea, mainly the eastern and southern part, over sandy and silty bottoms of the continental shelf. verified
Origin
Native verified

Behaviour & biology

Diet
Carnivore verified
Diet (detail)
Crabs, shrimps, crustaceans and small fishes from the bottom sourced
Social behaviour
Solitary verified
Territorial
No verified
Activity
Nocturnal inferred
Reproduction
Separate sexes verified
Sexual dimorphism
No verified
Seasonality
Bottom-dweller of soft bottoms; oviparous, with eggs in horny capsules ('mermaid's purses'). sourced
Special features
Diamond-shaped ray with granular, rough dorsal skin (hence 'radula') and rows of small thorns; no venomous spine. sourced

For anglers

Edibility
Commonly eaten verified
Fishing method
Bottom fishing with natural bait (worm, shrimp or fish) on or just above the seabed. inferred
Regulations source
FishBase ↗ inferred

Safety

Danger to humans
Harmless verified
First aid
Unlike stingrays this skate has no venomous tail spine and is harmless; the rough skin and thorns can abrade, however. sourced

Status & sources

Sources
FishBase via GBIF (DwC-A), CC-BY-NC 4.0

Same genus Raja

More from the family Rajidae

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