Jack mackerels or saurels are marine ray-finned fish in the genus Trachurus of the family Carangidae. The name of the genus derives from the Greek words trachys ("rough") and oura ("tail"). Some species, such as T. murphyi, are harvested in purse seine nets, and overfishing (harvesting beyond sustainable levels) has sometimes occurred.

It is often used in Japanese cuisine, where it is called aji, in Turkish cuisine, where it is called istavrit, and in Portuguese cuisine, where it is called carapau.

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