Source : Webster's Revised Unabridged Dictionary (1913)

Piscivorous \Pis*civ"o*rous\, a. [L. piscis a fish + vorare to
   devour: cf. F. piscivore.] (Zo["o]l.)
   Feeding or subsisting on fish.

Source : WordNet®

piscivorous
     adj : feeding on fishes