Similar Species
Spanish mackerel are similar in appearance to small King mackerel (Scomberomorus cavalla) and Cero mackerel (Scomberomorus regalis). All three are very similar in shape and coloration. They may be distinguished as follows:
The lateral line on Spanish and Cero mackerel 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.
The first (spiny) dorsal on Spanish and Cero mackerel has a prominent black patch. The King mackerel has none. As all three species normally keep the first dorsal folded back in a body groove, this difference is not immediately evident.
Spanish mackerel have prominent yellow spots on the flanks at all sizes. In addition to such spots, Cero mackerel 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 (4.5 kg), but they may still be seen as spots of slightly darker green on the upper back from some angles of view.
World wide there are many members of this genus quite similar to one or another of these three species. In particular, off Mexico, Atlantic Spanish mackerel may be confused with Serra Spanish mackerel (Scomberomorus brasiliensis) which may appear in the same area.
Read more about this topic: Atlantic Spanish Mackerel
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