nigrescens, Perca fluviatilis var. Heckel [J. J.] 1839:155 [Annalen des Wiener Museums der Naturgeschichte v. 2 (no. 1) (for 1840); ref. 2079] Not available, no distinguishing features; from Marizza R. near Philippoli in Rumelia, s. Bulgaria. •In the synonymy of Perca fluviatilis Linnaeus 1758 -- (Kottelat 1997:173 [ref. 22952]). Nomen Nudum. Current status: Synonym of Perca fluviatilis Linnaeus 1758. Percidae: Percinae.