Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† perca, ae, f., = πέρκη, a kind of fish, a perch, Plin. 9, 16, 24, § 57; cf. id. 32, 9, 34, § 107; 32, 10, 44, § 126; 32, 11, 53, § 145; Ov. Hal. 112; Aus. Idyll. 10, 115.