Lewis & Short

piscārĭus, a, um, adj. [piscis],

  1. I. of or belonging to fishing or fish, fish-: copia piscaria, Plaut. Cas. 2, 8, 65: forum piscarium, the fish-market, id. Curc. 4, 1, 13: hamulus, id. Stich. 2, 1, 17.
  2. II. Subst.
    1. A. piscārĭus, ii, m., a fish-monger: nullus in piscariā piscis erat: inter piscarios nemo vendebat, Varr. in Perott. in Cornucop.
    2. B. piscārĭa, ae, f., fish-market, Varr. Fragm. v. supra; Dig. 50, 16, 17.