1. College of Veterinary Medicine Gansu Agricultural University Lanzhou Gansu China
2. Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Research Institute of Fish Culture and Hydrobiology University of South Bohemia in České Budějovice Vodňany Czech Republic
3. Department of Veterinary Medicine Sindh Agriculture University Tandojam Pakistan