Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
piscōsus, a, um, adj. [etym. dub.; cf. Angl. -Sax. fisk, Germ. Fisch], full of fishes, abounding in fish (syn. pisculentus): amnes. Ov. F. 3, 581: scopuli, Verg. A. 4, 255: flumina, Sen. Ben. 6, 7, 3: Oceanus, Just. 44, 1, 7.