The Collaborative International Dictionary of English v.0.48:

Sea bass \Sea" bass`\ . (Zool.)
   (a) A large marine food fish (Serranus atrarius syn.
       Centropristis atrarius) which abounds on the Atlantic
       coast of the United States. It is dark bluish, with black
       bands, and more or less varied with small white spots and
       blotches. Called also, locally, blue bass, black sea
       bass, blackfish, bluefish, and black perch.
   (b) A California food fish (Cynoscion nobile); -- called
       also white sea bass, and sea salmon.
       [1913 Webster]

WordNet (r) 3.0 (2006):

black sea bass
    n 1: bluish black-striped sea bass of the Atlantic coast of the
         United States [syn: black sea bass, black bass,
         Centropistes striata]