Guitar Shark

Presentation

Guitar Shark is a cartilaginous fish with a flattened body, intermediate between that of rays and sharks. Its well-developed caudal fin and guitar-shaped head make it easily recognizable. It lives on the sandy and muddy bottoms of warm and temperate seas, often near the coasts. This group brings together several species distributed in the Rhinobatidae family, some of which frequent the Mediterranean, including the Tunisian coasts. It feeds mainly on small benthic invertebrates and fish. Several species are today threatened by overfishing and the degradation of coastal habitats.

The body is flat at the front, shaped like a triangular disc, and is extended by a muscular caudal part reminiscent of a shark. The skin is covered with rough dermal denticles, brown-gray to sandy in color, allowing good mimicry with the seabed. The eyes and vents are located on the top of the head, while the mouth and gill slits are on the ventral side.

Characteristics

Indicative values: they vary by subspecies, sex and region.

Habitat and distribution

The species frequents sandy, muddy or grassy bottoms of shallow coastal areas, including lagoons and estuaries. It can also be found down to moderate depths on the continental shelf. In the Mediterranean, it is associated with Posidonia meadows and calm coastal areas.

Behaviour

It is an essentially benthic species, spending much of its time immobile, partially buried in the sand. It is generally solitary or observed in small, loose groups, especially during breeding. Its behavior is not very aggressive towards humans, except in the case of direct handling.

Reproduction

The Guitar Shark is ovoviviparous: the eggs develop inside the body of the female and the young are born already formed. Gestation lasts several months and gives birth to a litter of a few individuals to around twenty juveniles depending on the species. Sexual maturity is late, which limits the renewal of populations in the face of fishing pressures.

Peculiarities

Its hybrid morphology between ray and shark makes it an interesting case study in the evolution of chondrichthyans. The Guitar Shark is capable of remaining immobile and buried for several hours, leaving only its eyes visible. Some species of the genus are among the most endangered chondrichthyans in the world.

Threats and conservation

Overfishing, particularly accidental fishing in coastal nets and trawls, constitutes the main threat. The degradation of coastal habitats, such as seagrass beds and nursery areas, aggravates the decline of populations. The fin and meat trade also contributes to the rarity of several species in the group.

References

Profile updated 15 August 2026 · Reviewed by the TunisieVet editorial team.