 This study investigated the potential adverse effects of copper sulfate on yellow catfish and found that it caused oxidative stress, immunosuppression and disruption of the fish's gill microflora. The researchers suggest that this could be due to the fact that copper sulfate is commonly used as an anti-parasitic agent in aquaculture, but its use should be carefully monitored to avoid any negative impacts on the health of the fish. This article was authored by Shen Zhou, Zhou Hongyang, Yisong, and others.