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Microplastic Consumption in Sympatric Black Bass Species in the Headwaters of the Mississippi River Drainage
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First assessment of microplastic consumption in sympatric black bass species in a temperate river system.
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Researchers quantified microplastic ingestion across three sympatric black bass species in the Monongahela River, finding plastics in every fish sampled and using Bayesian regression to show that consumption rates differ significantly by species, location, and season — highlighting that even closely related species in the same watershed accumulate microplastics very differently.
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.
Microplastic Ingestion by Fish in a Neotropical Reservoir: Effects of Reservoir Dynamics and Fish Traits
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Researchers examined microplastic ingestion by fish communities across different zones of a Neotropical reservoir in Brazil, finding that fish in calmer, lake-like zones and bottom-dwelling insect-eating species were most likely to ingest plastic particles. The study suggests that both reservoir design and fish ecology shape how microplastics move through freshwater food webs.
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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