Microplastic contamination in tropical fishes: An assessment of different feeding habits

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.

Microplastic ingestion by fish from beaches with different characteristics in a tropical bay

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Researchers studying fish in a tropical bay found that 1 in 5 fish had microplastics in their stomachs, and this happened across all species, sizes, and locations, including areas far from big cities. Even fish-eating predators (which many humans also eat) showed contamination, suggesting plastic pollution is now baked into the food web from top to bottom. Since some of these fish end up on dinner plates, this study is a reminder that microplastic exposure through seafood may be more widespread than we think, and more research is needed to understand what that means for our health.

Ecological and Seasonal Patterns of Microplastic Ingestion in Fish Near a Port Region in the Brazilian Amazon

Microplastics Ingestion by Fish Species in Thailand’s Aquatic Ecosystems

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Researchers synthesized data from 175 assessments of plastic ingestion by fish species across Thailand's aquatic habitats, revealing widespread microplastic occurrence and raising significant concerns about ecosystem health and the potential transfer of plastic contaminants to humans through seafood consumption.

Ingestion of Microplastic by Fish of Different Feeding Habits in Urbanized and Non-urbanized Streams in Southern Brazil

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Researchers found that fish in urbanized streams in southern Brazil were significantly more likely to have ingested microplastic fibers than fish in non-urbanized streams, and that omnivorous species faced the highest exposure risk. This highlights how urban development drives microplastic contamination into freshwater food chains long before particles reach the ocean.