Studies have shown that the activities of SOD, catalase (CAT), and glutathione peroxidase (GPx) display an increasing trend in fish exposed to Cd at low concentrations, but usually show a decreasing trend at high concentrations, and the dose‒response curve of Cd generally shows a parabolic form, which has been verified in the liver and gills of Charybdis japonica [ 161 ].
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