| eutrophication, ammonia intoxication, and infectious diseases: interdisciplinary factors of mass mortalities in cultured nile tilapia. | the present study was designed to assess the possible causes of the mass mortalities of nile tilapia oreochromis niloticus at el-behera governorate, egypt, in relationship to environmental and microbiotic factors. water samples were collected from fish farms at different locations and from lake edku to analyze water temperature, water ph, salinity, biological oxygen demand, dissolved oxygen, total ammonia nitrogen, and un-ionized ammonia. a number of moribund and freshly dead fish were sampled a ... | 2016 | 27484819 |