Effect of Oil Spills Dispersant (OSD Green) Upon Tilapia Zilli

General Company for Ports of Iraq used (OSD Green) as a dispersant of oil. This type of dispersant has been tested fortoxicity and effect on aquatic environment. The tests were occurred on (Tilapia) fish by applying different concentration ofdispersant (200, 400, 600, 800, 1000 and1500 mg/l) to identify its toxicity and impact on Tilapia fish. It was found the lethalconcentration is (300mg/l). Fish activity has been studied under sub lethal concentration and their effect on fish stress, based on the gills and fins movement. This type of dispersion treatment should be avoided unless critical situation as it’s harmful foraquatic environment and fish.