The Collaborative International Dictionary of English v.0.48:

Cunner \Cun"ner\ (k[u^]n"n[~e]r), n. [Cf. Conner.] (Zool.)
   (a) A small edible fish of the Atlantic coast (Ctenolabrus
       adspersus); -- called also chogset, burgall, blue
       perch, and bait stealer. [Written also conner.]
   (b) A small shellfish; the limpet or patella.
       [1913 Webster]