The Collaborative International Dictionary of English v.0.48:

Piscatorial \Pis`ca*to"ri*al\, Piscatory \Pis"ca*to*ry\, a. [L.
   piscatorius, fr. piscator a fisherman, fr. piscari to fish,
   fr. piscis a fish. See Fish the animal.]
   Of or pertaining to fishes or fishing. --Addison.
   [1913 Webster]

WordNet (r) 3.0 (2006):

piscatory
    adj 1: relating to or characteristic of the activity of fishing;
           "a piscatory life" [syn: piscatorial, piscatory]

Moby Thesaurus II by Grady Ward, 1.0:

19 Moby Thesaurus words for "piscatory":
   cynegetic, eellike, fishing, fishy, following, halieutic, hunting,
   in full cry, in hot pursuit, in pursuit, piscatorial, pisciform,
   pursuant, pursuing, questing, searching, seeking, selachian,
   sharkish