Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. piscĭcŭlus, i, m. dim. [piscis], a little fish, Varr. R. R. 3, 5: minuti, Ter. And. 2, 2, 32: parvi, Cic. N. D. 2, 48, 123; Vulg. Marc. 8, 7.
2. Piscĭcŭlus, i, m., a Roman surname: Junius Pisciculus, Plin. 36, 5, 4, § 39.