The Collaborative International Dictionary of English v.0.48:

Rosefish \Rose"fish`\, n. (Zool.)
   A large marine scorpaenoid food fish (Sebastes marinus)
   found on the northern coasts of Europe and America. called
   also red perch, hemdurgan, Norway haddok, and also,
   erroneously, snapper, bream, and bergylt.
   [1913 Webster]

   Note: When full grown it is usually bright rose-red or
         orange-red; the young are usually mottled with red and
         ducky brown.
         [1913 Webster]

WordNet (r) 3.0 (2006):

rosefish
    n 1: North Atlantic rockfish [syn: redfish, rosefish, ocean
         perch]
    2: large fish of northern Atlantic coasts of America and Europe
       [syn: rosefish, ocean perch, Sebastodes marinus]