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K. V. Dube ¹, R. P. Mali ¹

Affiliations
1 Dept. of Zoology, Yeshwant Mahavidyalaya, Nanded, 431 602, M.S., IN

Abstract

Heavy metals interfere with the metabolism of the organisms. The usage of mercury is widespread in industrial processes and in various products such as batteries, lamps and thermometers. The main pathway for mercury to humans is through the food chain, especially from aquatic route. Hence, in present investigation the freshwater crab, Barytelphusa guerini was exposed to acute toxicity of mercuric chloride for 24, 48, 72 and 96 hours. The percentage mortality of crabs was observed for the given period and toxicity of mercuric chloride was evaluated. The LC₅₀ value was determined at 0.215 ppm of mercuric chloride.

Keywords

Mercuric Chloride, Barytelphusa guerini, LC₅₀.

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R. P. Mali ¹, Shaikh Afsar ¹

Affiliations
1 Department of Zoology, Yeshwant College, Nanded-431 605, Maharashtra, IN

Abstract

The effect of zinc sulphate on cardiac physiology of Bartelphusa guerini was investigated after acute exposure to zinc sulphate. Remarkable differences were found between control and treated crabs. The rate of heart beat was studied at regular interval of 24 h up to 240 h (10days). The investigation showed an initial decline in heart rate up to 48 h, which then gradually decreases up to 240 h in control group. The treated animals showed initial increase up to 72 h and later there is a gradual decline in the rate of heart beat up to 240 h. The decline in rate of heart beat may indicate that animals try to settle down to the toxic medium and initial increase in the heart beat rate may be due to accelerative metabolic activity of the animal.

Keywords

Barytelphusa guerini, Zinc Sulphate, Toxicity, Cardiac Physiology.

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R. G. Pawale ¹, P. N. Wavde ¹, R. P. Mali ²

Affiliations
1 Department of Environmental Science, Yeshwant Mahavidyalaya, Nanded-431 602, Maharashtra, IN
2 Department of Zoology, Yeshwant Mahavidyalaya, Nanded-431 602, Maharashtra, IN

Abstract

Owing to the universal presence of fluoride in earth's crust, all waters contain fluoride in varying concentrations. Fluorine is an element of high biological activity and has a tendency to accumulate in organisms, making adverse effects possible even in very low levels of exposure. Iodine is an essential element for normal growth and development in animals and man. The effects of iodine deficiency on growth and development are seen at all stages of development and particularly in the fetus, the neonate and the infant. Water quality of two major drinking water reservoirs in Nanded district has been studied with special reference to the presence of fluoride and iodide along with other chemical parameters for the year January 2004 to December 2004. Study revealed that the fluoride and iodide content in the water was lower than minimum essential limit prescribed by various health organizations. The supply of iodine from food is recommended. The values of other parameters, i.e., pH and temperature were also found within the prescribed permissible limits for drinking water.

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