May through September is mackerel fishing season, according to the Florida Fish and Wildlife Conservation Commission. This season coincides with mackerel venturing into harbors and riverbeds, where they spawn annually.
Although mackerel that journey farther north, such as the Gulf of St. Lawrence and the mid-Atlantic Bight, tend to spawn slightly later than their southern counterparts, the overall spawning season occurs at roughly the same time. Depending on the local recreational regulations, size and bag limits potentially correspond to mackerel that spawn in Atlantic and Gulf of Mexico state waters.
While King and Spanish are more common to Atlantic and Gulf of Mexico state waters, Boston mackerel, or tinker, is abundant in the Gulf of Maine. Similar species include the chub mackerel and the bonito.