The Collaborative International Dictionary of English v.0.48:

Piscary \Pis"ca*ry\, n. [L. piscarius relating to fishes or to
   fishing, fr. piscis a fish.] (Law)
   The right or privilege of fishing in another man's waters.
   --Blackstone.
   [1913 Webster]

WordNet (r) 3.0 (2006):

piscary
    n 1: a workplace where fish are caught and processed and sold
         [syn: fishery, piscary]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

PISCARY. The right of fishing in the waters of another. Bac. Ab. h.t.; 5
Com. Dig. 366. Vide Fishery.