Dodecamethylcyclohexasiloxane (D6) is widely used daily in the chemical industry and exists environment; however, its eco-toxicity not well documented. A hydroponic experiment was performed to investigate effects of D6 exposure (10–1000 mg L−1) on oxidative stress induction gene expression changes crayfish (Procambarus clarkii). The results showed that superoxide dismutase (SOD) activity enhanc...