Offshore fish often move in schools. These are horse mackerel, tuna, bonito. Feeding on small fish, horse mackerel are themselves prey to a large number of pelagics, including tuna, bonito and king mackerel. The main species of fish encountered in the open sea belong to the Scombridae family.

The fish that make up this family have a regular spindle-shaped body, weakly compressed, ending in a thin peduncle, a first spiny dorsal fin followed by a second soft dorsal fin and then small additional dorsal fins called pinnules. The caudal fin is forked or crescent. The mouth is large with fine teeth. These animals are generally migratory making very important annual journeys linked to the spawning of the species. Tunas are distinguished from skipjack according to the size of the pectoral fins: in skipjack the pectoral fin is very small, not exceeding 15 cm in adults; in tunas the pectoral fin is highly developed reaching or exceeding the base of the second dorsal fin.

Skipjack generally live on the surface. They gather in compact schools of several thousand individuals hunting together small prey such as aiguillettes, sussands... The school is generally followed by flocks of birds which indicate the presence of fish.

Tuna generally live at depth, apart from young bigeye tuna.

To these fish we must add the dolphinfish (coryphaena hippurus) also called mahi-mahi, the king mackerel, the swordfish, the sailfish and the various marlins.