Their diet is mainly composed of fishes such as anchovy (Engraulis ringens), Araucanian herring (Strangomera bentincki) and silverside (Odontesthes regia) although the common hake (Merluccius gayi), Inca scad (Trachurus murphyi), garfish (Scomberesox
saurus scombroides), South American pilchard (Sardinops sagax) and various crustaceans and cephalopods have been reported as well (Herling et al., 2005).
In other study such as Sciaena umbra , Sparus auratus, Trigla cuculus, Sardina pilchardus, Mugil cephalus, Atherina hepsetus, Scomberesox
saurus , Serranus scriba, Epinephelus costae, Cephalopholis nigri and Pseudupenaeus prayensis  concentrations of Zn in liver was higher than muscle.
The Scomberesocidae, such as the skipper (Scomberesox
saurus) and other similar species, are pelagic fish 8-14 in (20-35 cm) long when adult.