The fins are rhomboid-shaped, with pointed sides, and their rear ends are concave and extend along the tail.

The males and females arrive together in inshore waters of the North Sea in early summer.

Eggs are covered in gel and laid in strings, which are attached to hard objects on the seabed.

They first appear in plankton samples towards the end of July; after about 15 to 30 days, they switch to a demersal mode of life.

In the Mediterranean Sea, the species is normally caught between 20 and 120 m depth over sandy-muddy substrates.