*4.1. Chemical and Materials*

Cadmium chloride (CdCl2) was purchased from West Long Chemical (Shantou, Guangdong, China). Fresh oysters (*Crassostrea hongkongensis*) were purchased from the local market in Zhanjiang, China. The kits for measurement of ALT (C009-2-1), AST (C010-2-1), ALP (A059-2-2), and LDH (A020-2-2) were offered by Nanjing Jiancheng Bioengineering Institute (Nanjing, China). The kits used to measure the levels of SOD (BC0170), GSH-Px (BC1195), CAT (BC0205), and MDA (BC0025) were purchased from Solarbio Science & Technology (Beijing, China), and the other chemicals were purchased from Sangon Biotech (Shanghai, China) unless specifically noted otherwise.
