Plastic Particles Found to Carry Fish-Killing Bacteria, Worsening Disease
Microplastics in water act as microscopic delivery vehicles for dangerous bacteria, dramatically increasing infection rates and death in farmed fish. The finding threatens aquaculture operations worldwide and suggests plastic pollution poses risks beyond direct toxicity—by amplifying existing pathogens already present in aquatic ecosystems.
Originaltitel: The Trojan Horse Effect of Microplastics: Mediating <i>Aeromonas Hydrophila</i> Transmission and Synergistic Pathogenesis in <i>Micropterus Salmoides</i>
Microplastics (MPs) are prevalent in aquatic environments, ingested by aquatic organisms, causing substantial impacts on major physiological functions, while their surfaces facilitate microbial colonization. However, the effect of MPs in facilitating pathogenic transmission, which is highly susceptible to serving as potential vectors for contaminants and pathogens, is not fully understood. This study investigated the synergistic effect of polystyrene microplastics (PS-MPs) as a pathogen vector in mediating Aeromonas hydrophila transmission. Electron microscopy revealed that PS-MPs can act as a carrier for A. hydrophila, significantly enhancing the bacterial infection in Micropterus salmoides, inducing a higher mortality rate and severe inflammatory infiltration in hepatic tissue, and disrupting the activities of antioxidant enzymes and the expression of related genes. These findings provide the first report of the mechanism underlying PS-MPs-mediated synergistic transmission of A. hydrophila in M. salmoides, establishing a crucial theoretical basis for the risk assessment of MPs pollution and for the control of aquaculture diseases.