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Twelve widely used pesticides were selected to investigate possible chemical, biological and toxicological effects of expired pesticides that may enter into our ecosystem. The selected compounds were tested for acute toxicity to Catla catla under static condition. Five to six concentrations (ranges from 0.005 - 80 mg I/1) of both expired and unexpired pesticide formulations were tested along with controls under similar conditions. The results of the LC50 (Lethal Concentration) demonstrated lower LC50 values for the expired pesticides as compared to the corresponding unexpired counter part. From this data, it is clear that expired pesticide formulations must be disposed carefully and care should be taken to avoid their discharge to water bodies and thus prevent loss to fish. [ABSTRACT FROM AUTHOR]

Abstract: Investigation of lethal dose of γ-HCH (gamma isomer of hexachlorocyclohexane), DDT (dichlorodiphenyltrichloroethane) and chlorpyrifos on spermatozoa motility after 40 days exposure in catfish, Heteropneustes fossilis was done under laboratory conditions. The sperm motility was done in the fishes captured from unpolluted ponds of Gujartal considering as reference site and polluted rivers Gomti and Ganga of north India at pre-spermiating stage. Results indicate that 1ppm of γ-HCH, DDT and chlorpyrifos was lethal dose on sperm motility. The motility of spermatozoa decreased in insecticide exposed fish as well as in the fishes of polluted rivers when compared with their respective controls. The sperm motility was highest at 1:2000 (testicular milt: extender) dilution and duration of sperm motility was 90s after post-activation. The duration of motility also declined in the fishes captured from polluted rivers when compared with the same species captured from the reference site. It is concluded that the insecticides decrease the sperm motility and its duration in exposed fish as well as in the captured fishes from polluted rivers causing the decline in fish population of riverine systems due to influence of xenobiotics on the endocrine system. [Copyright &y& Elsevier]

Studies the concentrations of pesticide residues in tissues of fish from Kolleru Lake in India. Analysis of fish samples through modified method proposed for gas chromatographic determination for the pesticides; Information on extraction efficiency and maximum concentrations of pesticides residues; Evaluation of the baseline data and pesticide pollution in ecosystem of the lake.