Side by Side

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 →

Spanish Mackerel Scomberomorus maculatus

Typical: 14–22 in, 1–3 lb

Quickest tell: Golden-yellow oval spots plus a black front patch on the first dorsal fin and an evenly sloping lateral line separate Spanish from the spot-poor king mackerel.

• Greenish back, silver sides with round golden-yellow spots (no stripes)
• Front third of first dorsal fin jet black
• Lateral line slopes gently to the tail, no abrupt dip
• Forked tail; row of finlets behind dorsal and anal fins
• Adults rarely exceed a few pounds (much smaller than king)

Full Spanish Mackerel guide — season, gear and rules →

When Each Is Running July — current month highlighted

Where King Mackerel and Spanish Mackerel Overlap

Both run in Gulf of Mexico, Southeast Atlantic — that is where telling them apart actually matters.

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