Spot on dorsal fin is best way to know it's a Spanish mack, not a king

Is that a king mackerel of a Spanish mackerel you’re about to slide into your cooler? It might not quite be the $64,000 question, but it is one that could be expensive for fishermen if they make the wrong guess.

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Spot on dorsal fin is best way to know it's a Spanish mack, not a king

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