الفهرس 
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Abstract
the toxicity of dimethoate(o,o-dimethyl-s-(n-methyl-carbamoyl methyl)phosphorodithoate,lannate(s-methyl-n(methi carbamoyl)oxythioacetimidate))and sevin(l-naphthylmethy carbamate)was investigated.
the first part of this study was conducted as biological experiments in the form of :determination of lc100 and lc 50,effect of trace elements on survival of fish and on lc 50,determination of clinical signs,
histopathological changes that is produced by dimethoate and lannate and chronic toxicity of the latter.