WordNet (r) 3.0 (2006):

rudderfish
    n 1: food and game fish around Bermuda and Florida; often follow
         ships [syn: Bermuda chub, rudderfish, Kyphosus
         sectatrix]
    2: fish having the habit of following ships; found in North
       American and South American coastal waters [syn:
       rudderfish, banded rudderfish, Seriola zonata]