Plural of cavalla, a large marine fish found in tropical Atlantic waters, also called a king mackerel or jack.
From Spanish 'caballa' meaning mackerel, derived from Latin 'caballus' (horse), possibly because of the fish's swift, horse-like movement through water.
The name 'cavalla' comes from a Spanish word meaning horse—fishermen noticed how these powerful fish dart through water with the speed and strength of a galloping horse!
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