Author(s): Chamarthy Manjulata and Prof DE Babu

Abstract: The common carp (Cyprinus carpio) was exposed to three different Aluminium salts, AlCl₃, Al₂(SO₄)₃ and Al (OH)₃ to determine the lethal concentration (LC₅₀) values at different times and effects of sub-lethal concentrations on blood glucose and serum calcium levels were estimated. The LC₅₀ values at varying times 24hr, 48hr, 72hr and 96 hr were recorded for three Aluminum salts. The LC₅₀ value of 96 hr for AlCl₃, Al₂ (SO4)₃ and Al (OH)3 was found as 3.580 ppm, 5.902ppm and 4.786ppm respectively. Fishes exposed to sub-lethal concentrations of the three Aluminium salts (1/4^th of the LC₅₀ for 96 hrs) for 30 days revealed that biochemical parameter like glucose increased significantly (p<0.001 ) from the control value whereas the serum calcium level decreased significantly (p<0.001) from the control.

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