Effect of Malafos (57 EC) Acute Toxicity on Fresh Water Fish Oreochromis Niloticus

The present study designed to investigate the effects of acute toxicity of malafos on behavioral and some haematological parameters in the fresh water fish Oreochromis niloticus. The fishes were collected the from Fisheries and Aquatic Research Center farm in Khartoum and private farm at Alshagera –Khartoum, fish were exposed to different concentrations of malafos (0.75, 1.00, 1.25, 1.50 and 1.75 mg/l) to determine the 96 h LC50 value which was (1.0125 ppm) of Malafos 57 EC for O.niloticus. Behavioral abnormalities were recorded in fish exposed to different concentrations levels of malafos. The present result revealed that malafo causes alterations in blood paremeters. Red (RBCs), hemoglobin (Hb) and hematocrit (Ht%)show significant decrease while white blood cells (WBCs)show increase in their noumber .

Keywords: malafos, Oreochromis niloticus,behavioral abnormalities , hematological change.