Source : Webster's Revised Unabridged Dictionary (1913)

Jewfish \Jew"fish`\, n. (Zo["o]l.)
   1. A very large serranoid fish ({Promicrops itaiara}) of
      Florida and the Gulf of Mexico. It often reaches the
      weight of five hundred pounds. Its color is olivaceous or
      yellowish, with numerous brown spots. Called also {guasa},
      and {warsaw}.

   2. A similar gigantic fish ({Stereolepis gigas}) of Southern
      California, valued as a food fish.

   3. The black grouper of Florida and Texas.

   4. A large herringlike fish; the tarpum.

Source : WordNet®

jewfish
     n 1: large important food fish of Australia; almost
          indistinguishable from the maigre [syn: {mulloway}, {Sciaena
          antarctica}]
     2: large dark grouper with a thick head and rough scales [syn:
        {Mycteroperca bonaci}]
     [also: {jewfishes} (pl)]