Source : Webster's Revised Unabridged Dictionary (1913)

Bluefish \Blue"fish`\, n. (Zo["o]l.)
   1. A large voracious fish ({Pomatomus saitatrix}), of the
      family {Carangid[ae]}, valued as a food fish, and widely
      distributed on the American coast. On the New Jersey and
      Rhode Island coast it is called the {horse mackerel}, in
      Virginia {saltwater tailor}, or {skipjack}.

   2. A West Indian fish ({Platyglossus radiatus}), of the
      family {Labrid[ae]}.

   Note: The name is applied locally to other species of fishes;
         as the cunner, sea bass, squeteague, etc.