The Collaborative International Dictionary of English v.0.48:

Permit \Per*mit"\, n. [Cf. Sp. palamida a kind of scombroid
   fish.]
   (a) A large pompano (Trachinotus goodei) of the West
       Indies, Florida, etc. It becomes about three feet long.
   (b) The round pompano. (Trachinotus falcatus). [Local, U.
       S.]
       [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

Trachinotus falcatus
    n 1: large game fish; found in waters of the West Indies [syn:
         permit, Trachinotus falcatus]