Similar Species
Small king mackerel are similar in appearance to Atlantic Spanish mackerel, Scomberomorus maculatus, and cero mackerel, Scomberomorus regalis, all three species being similar in shape and coloration. They may be distinguished as follows:
The lateral line on Atlantic Spanish mackerel and cero slopes gradually from the top edge of the gill to the tail. In contrast, that of the king mackerel takes an abrupt drop at mid-body (see illustration).
The first (spiny) dorsal fin on Atlantic Spanish mackerel and cero has a prominent black patch. The king mackerel does not. As all three species normally keep the first dorsal folded back in a body groove, this difference is not immediately evident.
Atlantic Spanish mackerel have prominent yellow spots on the flanks at all sizes. In addition to such spots, cero have one or more yellow stripes along the centerline. Young king mackerel have similar, but slightly smaller spots, these fade away on individuals weighing over 10 pounds (5 kg), but may still be seen as slightly darker green spots toward the back from some angles of view.
World wide, many fish of these three species are quite similar to one or another. Off Mexico, Atlantic Spanish mackerel may be confused with Serra Spanish mackerel, Scomberomorus brasiliensis.
Read more about this topic: King Mackerel
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