The Collaborative International Dictionary of English v.0.48:

bergall \ber"gall\ (b[~e]r"g[add]l), n.
   a small wrasse (Tautogolabrus adspersus), common in north
   Atantic coastal waters of the U. S.; -- also called the
   cunner.

   Syn: cunner.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

bergall
    n 1: common in north Atlantic coastal waters of the United
         States [syn: cunner, bergall, Tautogolabrus
         adspersus]