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Chronic exposure of mixed microplastics induces stress in Oreochromis niloticus
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Scientists exposed tilapia fish to microplastics for 30 days and found that higher doses caused real damage: liver problems, hormone imbalances, inflammation, and oxidative stress, plus plastic particles building up in their muscle tissue (the part we eat). This matters because it shows microplastic pollution isn't just an environmental nuisance, it can harm the health of fish we consume, raising questions about what long-term microplastic exposure might mean for people too.
Microplastic (MP) pollution is a growing risk to aquatic organisms. However, its chronic physiological effects on fish remains poorly described. Here we investigate that how the chronic exposure of mixed MPs affects demographics and physiology of Oreochromis niloticus. We exposed fish (n = 18) for 30 days to low-dose and high-dose concentrations of mixed MPs. Growth indices, liver biomarkers, serum markers, stress markers, oxidative stress-related enzymes, and bioaccumulation were assessed. The somatic effect of MPs was not statistically significant (p>0.05). However, higher concentration of MPs induced a significant hepatic atrophy (p<0.01), a decline in hepatic function (p<0.001), hepatocellular disruption (p<0.01), metabolic imbalance, endocrine stress, and inflammatory activation (p<0.05-0.001), an oxidative damage and impaired defense. FTIR and stereomicroscopy further confirmed the significant bioaccumulation of polymers in muscles but traces in brain. Our findings highlight subtle; yet, significant physiological risks in O. niloticus from chronic MP exposure.
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Researchers fed Nile tilapia daily doses of polypropylene microplastics for 30 days and observed significant health effects including changes in blood cell counts, altered gut bacteria, and tissue damage to the intestines and liver. The higher dose group showed more pronounced effects, including elevated inflammatory markers and signs of oxidative stress. The study provides evidence that chronic ingestion of microplastics commonly found in aquatic environments can cause meaningful harm to a widely consumed fish species.
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Researchers exposed Nile tilapia to low, environmentally relevant concentrations of polystyrene microplastics for 14 days and found the particles accumulated in multiple organs including the brain, liver, and reproductive tissues. The fish showed changes in blood chemistry, increased stress hormones, and signs of liver and kidney dysfunction. These results suggest that even realistic levels of microplastic pollution can cause measurable physiological harm in fish.
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