Menhaden

from WordNet (r) 3.0 (2006)

menhaden
    n 1: shad-like North American marine fishes used for fish meal
         and oil and fertilizer [syn: {menhaden}, {Brevoortia
         tyrannis}]

from The Collaborative International Dictionary of English v.0.48

menhaden \men*ha"den\, n. (Zool.)
   An American marine fish ({Brevoortia tyrannus}) of the
   Herring family ({Clupeidae}), chiefly valuable for its oil
   and as a component of fertilizers; -- called also
   {mossbunker}, {bony fish}, {chebog}, {pogy}, {hardhead},
   {whitefish}, etc.
   [1913 Webster]