Mycteroperca interstitialis (commonly known as the yellowmouth grouper, crossband rockfish, grey mannock, hamlet, harlequin rockfish, princess rockfish, rockfish, salmon grouper, salmon rock fish and the scamp) is a species of grouper that lives in the Caribbean and Atlantic Ocean in the tropical waters. It is also found in pockets in Brazil. It is a fairly large fish and it gets its name from the yellow around its mouth.