The Collaborative International Dictionary of English v.0.48:

Black bass \Black" bass`\ (Zool.)
   1. An edible, fresh-water fish of the United States, of the
      genus Micropterus. The small-mouthed kind is
      Micropterus dolomie[imac]; the large-mouthed is
      Micropterus salmoides.
      [1913 Webster]

   2. The sea bass. See Blackfish, 3.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Micropterus salmoides
    n 1: a large black bass; the angle of the jaw falls behind the
         eye [syn: largemouth, largemouth bass, largemouthed
         bass, largemouth black bass, largemouthed black bass,
         Micropterus salmoides]