Acute Toxicity of Two Pesticides Diazinon and Deltamethrin on Gambusia

There is a growing concern over aquatic pollution because of its detrimental effects on biological life including human beings. The goal of the present study was to determine the acute toxicity of diazinon and deltamethrin as potential dangerous organic pesticides to assess mortality effects of these chemicals to the gambusia in the form of LC . Fish samples (7 fish in each test group) were exposed to different concentrations 50 of diazinon and deltamethrin (between 0-32 ppm for diazinon and 0-0.20 ppm for deltamethrin) for 96 h in 100 L glass aquaria. The very low LC s obtained for deltamethrin (0.076 ppm) and diazinon (9.710 ppm) indicate that 50 deltamethrin and diazinon are highly toxic to gambusia. Further researches are recommended to study the processes by which these chemicals affect physiology and histology of fish and their accumulation in fish tissues.