• S Z Qasim

      Articles written in Proceedings – Animal Sciences

    • Determination of acute toxicity levels of mercury to the fishTilapia mossambica (Peters)

      Maria R Menezes S Z Qasim

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      Toxicity of inorganic mercury to the freshwater fishTilapia mossambica was demonstrated by static bioassays. Statistical analysis was used for calculating 48 hr median tolerance limit, 95% confidence limits and the slope function (S). No mortality was observed within 48 hr in mercuric chloride concentration of 0.7 mgl−1 although the swimming activity of the fish decreased and the rate of opercular movement increased significantly. Concentrations of 0.9 mgl−1 and higher proved lethal. Symptoms of mercury poisoning and safe concentrations of mercury have been discussed.

    • Use of electrophoresis and immunoelectrophoresis in taxonomic and pollution studies

      Maria R Menezes S Z Qasim

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      Studies were conducted on the electrophoresis of blood serum and eye lens proteins of 5 fishes and immunoelectrophoresis of the soluble lens proteins of 10 fishes. The effects of a toxic pollutant (mercury) on the electrophoretic patterns of the serum, haemoglobin and eye lens proteins of a euryhaline fishTilapia mossambica (Peters) has also been studied. The use of fish blood morphology as a biological index of water quality has been indicated.

    • Pollution of the seas around India

      S Z Qasim R Sen Gupta T W Kureishy

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      The state of marine pollution along the 7000 km long coastline and 2·015×106 km2 exclusive economic zone of India is summarized. The coastal water receives 4·1 km3 of domestic sewage and 0·41 km3 of industrial wastes. Nearly 447 million tonnes of oil and its products are transported through the Arabian Sea and Bay of Bengal with the result that some of our coastal areas particularly adjoining the large cities are getting polluted. Increased eutrophication and decrease in dissolved oxygen associated with the generation of toxic hydrogen sulphide have been observed at several places. Heavy metal concentrations are largely within the acceptable limits in water and in biota excepting in a few areas. Organochlorine and pesticides residues have often been found to be high in zooplankton and in the sediments near the confluence of the river and the sea, indicating their land origin. Oil pollution is a chronic problem in the northern Indian Ocean. Several of the endangered ecosystems have now been offered protection by declaring them as marine parks. It is recommended that to maintain coastal waters clean, wise and judicious use of the ocean must form an integral part of our planning.

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