The Collaborative International Dictionary of English v.0.48:

Scaldfish \Scald"fish`\, n. [Scald, a. + fish.] (Zool.)
   A European flounder (Arnoglossus laterna, or Psetta
   arnoglossa); -- called also megrim, and smooth sole.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Megrim \Me"grim\, n. [Etymol. uncertain.] (Zool.)
   The British smooth sole, or scaldfish (Psetta arnoglossa).
   [1913 Webster]