Side by Side

Cero Mackerel Scomberomorus regalis

Typical: 18–30 in, 3–8 lb

Quickest tell: The bronze midbody stripe with rows of spots above and below it is unique to cero; king mackerel adults are plain-sided and their lateral line drops sharply under the second dorsal.

• Bronze-to-yellow stripe running along the midbody from pectoral fin to tail
• Rows of yellow-bronze spots ABOVE and BELOW that stripe
• Black patch on the front of the first dorsal fin
• Slender mackerel body with a row of finlets and a deeply forked tail
• Lateral line curving gently down — no sharp drop

Full Cero Mackerel guide — season, gear and rules →

King Mackerel Scomberomorus cavalla

Typical: 24–40 in, 8–20 lb

Quickest tell: The sharp downward dip in the lateral line under the second dorsal, plus a pale (not black-fronted) first dorsal fin, marks a king mackerel.

• Steel-blue back, silver sides; adults lack spots
• Lateral line drops sharply downward below the second dorsal fin
• First dorsal fin uniformly pale (no black front patch); folds into a groove
• Slender elongate body, deeply forked tail
• Row of finlets behind dorsal and anal fins
• Juveniles may show faint yellow spots

Full King Mackerel guide — season, gear and rules →

When Each Is Running September — current month highlighted

Where Cero Mackerel and King Mackerel Overlap

Both run in Puerto Rico & the U.S. Virgin Islands — that is where telling them apart actually matters.

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