File Entry: Impact of the water quality of El-Rahawy Drain on some genetic and histopathological aspects of Oreochromis niloticus

The present study aims to evaluate the water quality of two locations in 
Rosetta Branch of River Nile and its histopathological and genetic adverse 
effects on Nile tilapia (Oreochromis niloticus). Water and fish samples were 
collected from up and downstream of El-Rahawy Drain discharge point 
(location I and II, respectively) during the summer and winter seasons. The 
water quality, liver histopathology and DNA alteration of fish was 
examined. ISSR-PCR technique was used to assess the genetic variation of 
fish samples from these locations. The water quality parameters ( BOD, 
COD,……)were increased at location II compared with location I in 
addition to depletion in dissolved oxygen. Moreover, the fish samples 
collected from location II showed severe histological and molecular 
alterations than those collected from location I. It is recommended that the 
government must increase the awareness of people around the River Nile, 
and improve the environmental management to reduce the risks of polluted 
water and consuming the fish exposed to this water on human health.