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Effect of microplastics on Yersinia ruckeri infection in rainbow trout (Oncorhynchus mykiss)
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Researchers found that microplastic exposure predisposed rainbow trout to more severe Yersinia ruckeri infections, with co-exposed fish showing worse blood biochemical parameters and hepatic oxidative stress compared to fish exposed to the pathogen alone.
Exposure to microorganisms such as Yersinia ruckeri can significantly affect bacterial infections in fish. Microplastics (MPs) may predispose fish to infection and act as carriers in pathogen transmission. Therefore, this study is designed to evaluate MPs' effect on damage caused by exposure to Y. ruckeri in rainbow trout. In this study, blood biochemical parameters and hepatic oxidative biomarkers as clinical signs were measured in the fish co-exposed to Y. ruckeri (5 and 10% the median lethal dose (LD)) and MPs (500 and 1000 mg Kg) for 30 days. There were no significant changes in the creatinine, triglyceride, cholesterol levels, and glutamic-pyruvic transaminase activity in the blood of fish infected with Y. ruckeri. In contrast, exposure to MPs had a significant effect on most clinical parameters. The total protein, albumin, globulin, total immunoglobulins, high-density lipoprotein, low-density lipoprotein, cholesterol levels, and γ-glutamyltransferase activity decreased, whereas glucose, triglyceride, and creatinine levels, and glutamic-oxaloacetic transaminase, glutamic-pyruvic transaminase, alkaline phosphatase, and lactate dehydrogenase activities increased in the plasma of fish after co-exposure to MPs and Y. ruckeri. Dietary MPs combined with a Y. ruckeri challenge decreased catalase and glutathione peroxidase activities, and total antioxidant levels. However, superoxide dismutase activity and malondialdehyde contents increased in the hepatocyte of fish co-exposed to MPs and Y. ruckeri. This study suggests that fish exposure to MPs and simultaneous challenge with Y. ruckeri could synergistically affect clinical parameters.
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Toxicity Effects of Microplastics Individually and in Combination the Fish Pathogen Yersinia Ruckeri on the Rainbow Trout (Oncorhynchus Mykiss)
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Researchers found that co-exposure of rainbow trout to polystyrene microplastics and the fish pathogen Yersinia ruckeri exacerbated blood biochemical disruptions and hepatic oxidative stress compared to either stressor alone. The results suggest microplastics may act as a predisposing factor that amplifies bacterial infection severity in fish.
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Researchers investigated what happens when Korean rockfish are exposed to both microplastics and the fish pathogen Streptococcus iniae at the same time. They found that microplastics can bind to the bacteria and amplify harmful effects on the fish's antioxidant defenses and immune responses beyond what either stressor causes alone. The findings suggest that microplastic pollution in coastal aquaculture environments may worsen the impact of bacterial infections on fish health.
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Korean rockfish were co-exposed to polystyrene microbeads and the bacterium Streptococcus iniae for five days, and oxidative stress and apoptosis were measured in liver tissue. Combined high-dose exposure significantly elevated oxidative stress markers and caspase-3 expression compared to either stressor alone, suggesting microplastics may enhance bacterial infection severity.
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Researchers studied the combined effects of polystyrene nanoplastics and a bacterial infection on grass carp, a common freshwater fish. They found that nanoplastic exposure worsened the impact of the infection by increasing oxidative stress, suppressing immune responses, and disrupting the gut microbiome. The study suggests that nanoplastic pollution in waterways could make fish more vulnerable to disease by weakening their natural defenses.
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