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]

The Collaborative International Dictionary of English v.0.48:

Blackfish \Black"fish\, n.
   1. (Zool.) A small kind of whale, of the genus
      Globicephalus, of several species. The most common is
      Globicephalus melas. Also sometimes applied to other
      whales of larger size.
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   2. (Zool.) The tautog of New England (Tautoga).
      [1913 Webster]

   3. (Zool.) The black sea bass (Centropristis atrarius) of
      the Atlantic coast. It is excellent food fish; -- locally
      called also black Harry.
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   4. (Zool.) A fish of southern Europe (Centrolophus
      pompilus) of the Mackerel family.
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   5. (Zool.) The female salmon in the spawning season.
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   Note: The name is locally applied to other fishes.
         [1913 Webster]