Abstract:
This study was conducted during ( May-2018) to study the effects and toxicity of short term expose we insecticide Cypermethrin on (Oreochromious niloticus) tissuses including: the gills, liver, kidney, and intestine and to study the effects of insecticide Cypermethrin on the fish behavior.
Fish sampl stuayc (Tilapia) were obtained from the fish Hatchery of the Department in fisherieS and wildlife Science. 30 adult fish of both sexes were used in this experiment. average weight was (50ــــ 100 g.) fish were divided in to five groups and subjected to Cypermethrin insecticide solution in 4 dosages as follow :
The first group was exposed to 0.0001ppm Cypermethrin insecticide, the total amount of solution was 3 ml Cypermethrin insecticide / 30 liter water.(D)
The second group was exposed to 0.0002ppm Cypermethrin insecticide, the total amount of solution was 6 ml Cypermethrin insecticide / 30 liter water. (B)
The third was group was exposed to 0.0003ppm Cypermethrin insecticide, the total amount of solution was 9 ml Cypermethrin insecticide / 30 liter water.(E)
The fourth group was exposed to 0.0004ppm Cypermethrin insecticide, the total amount of solution was 12ml/ 30 liter water (A) Results of histology indicates several kinds of damages in all studied organs,in liver showed Focal areas of necrosis , Dilation and thrombosis formation in central vain and ruptured hepatocytes and vacuolation , in gills we found sloughing of secondary lamellae and congestion in blood vessels of gill filaments while the kidney notice shrinking of glomeruli and Blood congestion, and intestine notice mucosa and submucosa damage and hemorrhages. Many behavioral observation were notice ,rapid swimming and lose of balance were observed in different dosages.
