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Deciphering the Microplastic Toxicity Cascade in Freshwater Fish: Integrating Machine Learning and Multi-Level Biological Responses
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Scientists fed young grass carp (a common food fish) different amounts of microplastic particles for 30 days and found the plastic caused stress damage, brain enzyme disruption, immune system changes, and significantly stunted growth, even at the lowest doses tested. While this study was done in fish, not humans, it's a reminder that the plastic contamination building up in our waterways and food chain may have real biological effects worth taking seriously, especially since we consume fish that could be exposed to similar conditions.
This study evaluated the effects of polyamide microplastics (PA-MPs) on juvenile grass carp by integrating histopathology, oxidative stress, neurotoxicity, immune-related gene expression, swimming behaviour and growth performance through a multi-layered statistical and machine-learning framework. Fish were exposed to 0, 10, 100 and 1000 μg/g PA-MPs for 30 days. Lipid peroxidation and superoxide dismutase increased dose-dependently, indicating oxidative stress, while brain acetylcholinesterase (AChE) activity was inhibited by 27.2% and responded significantly even at the lowest exposure, identifying it as an early and sensitive neurotoxic marker. All four immune-related genes were up-regulated, with the anti-inflammatory cytokine IL-10 showing the largest relative increase (+75.0%). These changes were accompanied by significant declines in weight gain (-56.2%) and feed efficiency, with benchmark dose modelling placing a 10% reduction in weight gain below the medium exposure level and Bayesian estimation assigning a 96.3% probability of a reduction exceeding 0.25 g at the highest dose. Overall, dietary PA-MP exposure produced coordinated disturbance across oxidative, neurotoxic, immune, histopathological and behavioral endpoints together with impaired growth, and the relationships among these levels are best interpreted as statistically supported associations rather than as a demonstrated causal sequence.
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Integrated biomarker responses to dietary polypropylene microplastics in rainbow trout (Oncorhynchus mykiss) under simulated aquaculture conditions
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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.
The effects of exposure to microplastics on grass carp (Ctenopharyngodon idella) at the physiological, biochemical, and transcriptomic levels
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Researchers exposed grass carp to microplastics at two concentrations for 21 days and observed liver damage, inhibited growth, and increased oxidative stress. Transcriptome analysis revealed over 1,500 differentially expressed genes related to immune response, metabolism, and cellular stress pathways. The study suggests that microplastic exposure can trigger broad physiological and molecular disruptions in freshwater fish.
Ecotoxicological effects of low-density polyethylene microplastic on Heteropneustes fossilis: behavioral, hematological, biochemical, and histopathological impacts
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Scientists exposed freshwater fish to tiny plastic particles (microplastics) from everyday items like plastic bags and found they caused serious health problems including blood disorders, organ damage, and weakened immune systems. The higher the amount of plastic particles, the worse the damage became to vital organs like gills, intestines, and liver. This matters because these same microplastics are found throughout our food chain and water supply, raising concerns about potential health risks for humans who consume contaminated fish and water.
Impacts of microplastic accumulation in aquatic environment: Physiological, eco-toxicological, immunological, and neurotoxic effects
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This review summarizes how microplastics build up in fish and other aquatic life, causing damage to their immune systems, nervous systems, and overall health. When fish eat microplastics, the particles move up the food chain and can eventually reach humans through seafood consumption. The authors also discuss strategies for removing microplastics from water and reducing plastic pollution.
Microplastics Pollution in Freshwater and Marine Fisheries: Sources, Bioaccumulation, Ecotoxicological Impacts, and Sustainable Mitigation Strategies
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Tiny plastic particles are showing up everywhere in our lakes, rivers, and oceans—and fish are eating them, with the plastic building up mainly in their gut and gills but sometimes spreading to other tissues too. This review of existing research shows these particles can cause stress, inflammation, and other health problems in fish, and since we eat seafood, that raises real questions about what ends up on our plates. The good news: the paper points to practical fixes, like better waste management and fishing practices, that could cut plastic pollution before it reaches our food supply.
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