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Evidence of Microplastics Accumulation in the Gills and Gastrointestinal Tract of Fishes from an Estuarine System in Ghana
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Microplastics in Juvenile Commercial Fish from an Estuarine Environment
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Juvenile commercial fish from an estuarine environment were found to have ingested microplastics, demonstrating that plastic contamination affects fish at early life stages in transitional coastal ecosystems rather than only in open ocean habitats. Since estuaries serve as nurseries for many commercially important species, microplastic ingestion by juveniles threatens both fish population health and the safety of seafood reaching consumers.
Microplastic in fish – A global synthesis
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A global synthesis of microplastic ingestion data from marine, freshwater, and estuarine fish found that 49% of sampled fish worldwide had ingested plastic, averaging 3.5 pieces per fish, with freshwater fish and those from aquaculture sources showing higher ingestion rates than wild marine fish. This comprehensive analysis reveals that microplastic contamination of fish — a primary human protein source globally — is now the rule rather than the exception, underscoring urgent risks to food safety.
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Analysis of gill tissue from 98 freshwater fish across eight species in Brazil's Sorocaba River basin found microplastics in every individual, with fibers comprising 74% of the 385 particles detected and highest contamination in the most disturbed river. The universal gill contamination across species demonstrates that freshwater fish in human-impacted watersheds serve as a direct route for microplastic entry into aquatic food webs and ultimately human diets.
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Researchers analyzed microplastic contamination in six coral reef fish species from Saint Martin's Island in the Bay of Bengal, finding 100% occurrence rates, with 4-10 microplastics per gastrointestinal tract dominated by polypropylene and polyethylene fibers, and polymer hazard index scores classifying all species in the high-risk 'Danger' category.
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