One of the mysteries of the English language finally explained.
1A sea chub of the family Kyphosidae; especially the Bermuda chub, Kyphosus sectatrix.
2Chiefly US. Either of two vertically-striped carangids: the pilotfish, Naucrates ductor, and (more fully "banded rudderfish") Seriola zonata, an amberjack of the West Atlantic.
3A fish of the family Centrolophidae; especially (US, now rare) the barrelfish, Hyperoglyphe perciformis (more fully "black rudderfish"), and (NZ) the blackfish, Centrolophus niger.
Mid 18th century; earliest use found in Philosophical Transactions of the Royal Society of London. From rudder + fish.
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