Some Toxicological Studies of Organo phosphorus Insecticides (( Curacron)) to nile Fish((clarias Lazera))

Festicides are economic poisons employed to regulateand inpac t noxious animals upon our life and eco nomy ,The effect of vast majority are relatively non selectiveand uaage, ’I’h er e: .. ore it may result in undersirable, evenunanticipated side effects. In Egypt a vast numbers oforgano-phosphorus insecticides are used for controlcotton insects. Several h ar z ar d s occurred from contarnin-ation of plants or water used for irrigation. In manyinstance these compounds enter the aquatic enviroment notonly by chance from application to agriculural lands,but are introduced directly as a result of unawaredisposal of these comound s , Treatment of cu L tivatedlands made frequently in Egypt by ultra low volume (U.L.V.)application by aircraft and might affect not only landanimals in treated area, but fish also living in streamspassing through it. ’llhe possibility that a particularpesticide be washed from the land to water streams insufficient concentration causing injUI’y varies greatlyfrom one compo.und to other eThe great area of water in Egypt, either marine, lakesor t he Iland fr e sh water of the Nile, make fish cul tur e