The sand steenbras or striped seabream (Lithognathus mormyrus) is a species of marine fish in the family Sparidae, colloquially known as the common bastardfish for nipping at the legs of swimmers.

It is found in shallow water in the Mediterranean Sea and in the eastern Atlantic Ocean from France to South Africa.

It is found in estuaries and bays over sandy and muddy seabeds and sea grass meadows.

[1] As a protandric hermaphrodite, the sand steenbras starts its adult life as a male and later changes its sex to female.

[3] This fish is caught for human consumption throughout most of its range but is not in general a targeted species due to its small size.