Bioaccumulation of lead in various tissues of the freshwater fish catla catla (hamilton, 1822)

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International Journal of Development Research

Bioaccumulation of lead in various tissues of the freshwater fish catla catla (hamilton, 1822)

Abstract: 

A study was conducted to evaluate the level of heavy metal lead (Pb) in various tissues of adult Catla catla when exposed to a sub-lethal concentration of 6.52 mgL-1 (1/25th of 96 hrs LC50 value) for a period of 120 days of exposure. The bioaccumulation of lead in the tissues studied was increased with duration of exposure periods. The pattern of lead accumulation was in the decreasing order of kidney > liver > gill > ovary > testis > brain at the end of 120 days of exposure. Preferential accumulation of lead was also observed in the tissues under experimentation. This may be due to the physiological differences and the position of each tissue in the fish. The maximum level of Pb was observed in kidney at the end of exposure period and which is related to the role of kidney as the excretory organ. The minimum concentration of Pb and the gender specific accumulation was also observed in gonads. Pb concentration was more in ovaries than the testis and this may be because of metabolic differences between the sexes. During the study period the level of Pb was minimum in brain. This may be due to the indirect contact of brain with the medium. Prolonged exposure of Pb may cause chronic nephropathy, hypertension, pathological changes and also reproductive impairments. Hence, the Pb level in the tissues of aquatic animals are occasionally monitored to ensure that the level do not constitute health hazards to consumers.

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