This video presents the harvesting and sexing grass carp (Ctenopharyngodon idella) broodstock prior to the artificial spawning of grass carp. Since mid 1990s, the use of herbicides in the River Nile and irrigation canals has been banned in Egypt. Instead, grass carp has been used as the biological control agent for aquatic plants. This video has been taken in the facility of a governmental hatchery located in the Barrage, Egypt. Male grass carp brood fish is identified by the roughness of the underside of its pectoral fin.