… The present study used Nile Tilapia (Oreochromis niloticus) as an biological markers to
revealed the concentration of some heavy metals(Cu, Pb and Cd) in water ,gills and muscles of
fish collected from four sites in Egypt (Maryout lake,Manz … Ahmed Hosieny Abdou Mhamd,
"Estimation of heat shock protein 70 (Hsp70) gene expression in Nile tilapia (Oreochromis
niloticus) using Quantitative Real-time PCR", Zagazig Journal of Agriculture Research, 2017
More … Ahmed Mansour Mohamed Mansour Elzohery, "Bio-fertilizer and organic manure affects …

Genetics Dept., Fac. of Agric., Zagazig University, Egypt ontamination of aquatic ecosystems
with heavy metals has increased worldwide. Heavy metals are interesting and noteworthy
due to their strong impact on aquatic ecosystems and their bioaccumulation in hydrobionts.
Cadmium and Copper were tested in genotoxicity assays with some contradictory results
(Ayllon and Garcia, 2000; Conners and Black, 2004). Metal accumulation causes an
increase in highly reactive oxygen species (ROS) such as hydrogen peroxide, superoxide …