The Collaborative International Dictionary of English v.0.48:

Gade \Gade\, n. [Cf. Cod the fish.] (Zool.)
   (a) A small British fish (Motella argenteola) of the Cod
       family.
   (b) A pike, so called at Moray Firth; -- called also gead.
       [Prov. Eng.]
       [1913 Webster] Gadere