Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
piscātōrĭus, a, um, adj. [piscator], of or belonging to fishermen, fishing-: naves, fishing-smacks, Caes. B. C. 2, 4; Liv. 36, 27: casa, Petr. 115: harundo, a fishing-rod, Plin. 16, 36, 66, § 172: lina, of which nets were made, id. 24, 9, 40, § 65: forum, Col. 8, 17, 15: piscatorii ludi vocantur, qui quotannis mense Junio trans Tiberim fieri solent a praetore urbano pro piscatoribus Tiberinis, Fest. p. 238 Müll.; cf. Ov. F. 6, 239: piscatorium aes vetusto more appellatur, quod in monte Albano datur pro piscibus, Fest. p. 210 Müll.