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Effect of Polyvinyl Chloride and Polystyrene Micro-Plastics on Growth, Digestive Enzymes, Oxidative Stress, and DNA Damage in Ctenopharyngodon idella.
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Fish fed diets containing common plastic particles (from PVC and polystyrene, found in packaging and household items) grew significantly slower, showed signs of cell stress, and had more DNA damage compared to fish without plastic exposure—and these effects got worse with higher plastic doses. Since these fish are a food source, this research is a reminder that microplastics polluting our waterways don't just harm aquatic life—they raise questions about what ends up on our plates, too.
Micro-plastics (MPs) have become a constant source of pollution in freshwater bodies and increasingly becoming a threat to aquatic life. Chronic exposure to MPs has been linked to the inhibition of growth, deformations in digestive physiology, oxidative stress, and cellular injury. Current study was conducted on fish (Ctenopharyngodon idella) acclimatizing and exposing them to a 90-day dietary exposure to MPs. The growth performance indicators, that is, digestive enzymes, oxidative stress biomarkers, and DNA damages were measured in the pre- and post-dietary exposure to the MPs. There was a progressive decrease in the growth performance indicators such as highest increase in weight as found in 30% PVC group (6.95 ± 2.69 g) and the 30% PS group (2.91 ± 3.28 g) was far less as compared to the corresponding controls (18.8 ± 5.86 and 16.07 ± 5.32 g, respectively). The levels of catalase activity in the control fish kidney, skin, heart, brain, and gill tissues were significantly higher than in the exposed groups (p < 0.05), whereby superoxide dismutase activity were increased, an indication to the increased oxidative stress. Digestive enzyme reactions were tissue-specific, where lipase was the most sensitive, mainly in the stomach and liver, at the increased dosage. The frequency of micronuclei also increased in the erythrocytes of exposed fish, which proves that polymers caused concentration-dependent genotoxic damage. Hence, PVC and PS MPs had negative effects on C. idella whereby growth was affected, antioxidant status was disturbed, genotoxicity was augmented, digestive enzyme biomarkers were affected, and micro-nucleus frequency was increased. Further research is required on chronic exposure, histopathological changes, and the mechanisms of MPs toxicity at the molecular level.
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Scientists fed rainbow trout food containing tiny plastic particles (microplastics) for 45 days and found the fish grew more slowly, with the plastic causing stress and damage in their liver, brain, and other organs, effects that got worse with higher plastic doses and longer exposure. Since farmed trout is a common food fish, this research is an early warning sign that the growing amount of microplastic pollution could affect the health of fish we eat, though more research is needed to know exactly what this means for humans.
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Scientists found that plastic particles in water seriously harm fish by damaging their liver and slowing their growth. Since we eat fish and plastic pollution affects the entire food chain, this research suggests that microplastics could eventually impact human health too. The more plastic particles in the water, the sicker the fish became, which is concerning because plastic pollution in our waterways keeps getting worse.
Dose-Dependent Cytotoxicity of Polypropylene Microplastics (PP-MPs) in Two Freshwater Fishes
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Researchers fed zebrafish and freshwater perch polypropylene microplastics at low and high doses and measured cellular damage in liver and gill tissues. They found dose-dependent toxicity including DNA damage up to 18-fold higher than controls, lipid peroxidation, and disrupted metabolism of key compounds like tryptophan. The study provides evidence that polypropylene microplastic ingestion causes significant cellular harm to freshwater fish in a dose-dependent manner.
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Nile tilapia fish fed three common types of microplastics (PVC, polypropylene, and PET) showed reduced growth, abnormal behavior, blood cell damage, and tissue damage in their gills, liver, and intestines. The harmful effects increased with higher doses of microplastics and varied by plastic type. Since tilapia is one of the most widely consumed fish globally, these findings raise concerns about the health of fish that may carry microplastic contamination to human diets.
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.
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