rudderfish

noun

Definition of rudderfish

: any of various fishes reputed to follow or accompany ships:

a : pilot fish sense 1

b : banded rudderfish

c : any of several butterfishes (family Stromateidae)

d : any of various fishes of the family Kyphosidae especially : bermuda chub

e : the opaleye or other fish of the family Girellidae

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