The longfin grouper (Epinephelus quoyanus) is a grouper in the genus Epinephelus. It is found in the Western Pacific, from Japan to Australia. As other fish, the longfin grouper has several species of parasites, including the diplectanid monogenean Pseudorhabdosynochus justinei, parasitic on the gills. Learn more about Longfin Grouper