The grey mullets are a family of medium to large sized fish comprising 78 species and are found world-wide. Grey mullets often have longish bodies, broad, flat heads, two well separated dorsal fins, small mouths and few or no teeth. The pectoral fins are set high up on the side of the body and the scales are rough and medium to large in size. The tail fin is concave or may be weakly forked.
Grey mullets are not always grey in colour, in fact they can be dark blue, dark olive, greenish, or greyish on the back, with silvery or pale/yellowish sides and undersides. Some species may have a dark bar or spot at the base of the pectoral fins. Some species have faintish dark stripes following the scale rows. The fins can be dusky or pale yellowish, particularly the pelvic fins, and may also have dusky margins.
Travel in schools and feed on algae, waste and debris found in the sea, with some species have unusually strong stomachs to help in digestion.