Toxicity of Selenium in the Fresh Water and the Role

Experiments were carried out to study the effect of water plant. Eichhornia to control the selenium residues in a fresh water cat fish. Heteropneustes fossilis (Bloch) Hundred percent mortality was observed at a concentration of 42 ppm selenium. The LC₅₀ value was found to be 26.4 ppm. At a concentration of 6 ppm and below, the fishes survived without any stress. So 6 ppm and below is considered to be the sub-lethal or around sub-lethal concentration. The rate of oxygen consumption decresed by 66.67% in control fishes, raised without plant, while experimental fishes, raised with aquatic plant, showed a drop of 58.99%. The protein content in the muscle tissue of experimental fishes was minimized by 18.29%. The heavy metal selenium accumulation in the muscle tissue of the control fishes was more significant (65.23%) than that of the experimental ones. The loss of energy was also found to be higher (1.35% higher) in the control fishes than that of the experimental fishes raised along with Eichhornia.