Changes in selected biomarkers in freshwater teleost fish, Cyprinus carpio var. communis exposed to sublethal concentrations of chromium sulphate toxicity.

The toxicity of chromium sulphate on plasma electrolytes (Na+, K+, Cl-) level and Na+, K(+)-ATPase activity of an economically important fish, Cyprinus carpio var. communis was evaluated. During sublethal treatment, plasma sodium level was increased, whereas plasma chloride level decreased throughout the experimental period.