The Collaborative International Dictionary of English v.0.48:

Wrymouth \Wry"mouth`\, n. (Zool.)
   Any one of several species of large, elongated, marine fishes
   of the genus Cryptacanthodes, especially Cryptacanthodes
   maculatus of the American coast. A whitish variety is called
   ghostfish.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Cryptacanthodes maculatus
    n 1: eellike Atlantic bottom fish with large almost vertical
         mouth [syn: wrymouth, ghostfish, Cryptacanthodes
         maculatus]