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Microplastics in the Gastrointestinal Tract of Red Swamp Crayfish
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Spatial distribution and characterization of microplastics in crayfish from inland waters of Türkiye
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Researchers analyzed 200 crayfish from eight Turkish lakes and detected microplastics in 62% of individuals, with significant spatial variation linked to land use and wastewater inputs, and polyethylene and PET fibers and fragments predominating. Freshwater crayfish prove effective bioindicators for mapping microplastic pollution across inland water bodies, revealing how human activity patterns drive contamination of food species consumed by local communities.
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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.
Microplastics in Snails from an Urbanized Creek
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Aquatic snails collected from an urbanized creek in Knoxville, Tennessee were found to contain an average of more than 12 microplastic particles each, with microfibers comprising 92% of the 212 total particles recovered from just 10 specimens. This study demonstrates that urban freshwater invertebrates are heavily exposed to microplastics, with clothing-derived microfibers as the dominant source, raising concerns about contamination moving up the food chain.
Microplastics in Freshwater Ecosystems
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Researchers reviewed the widespread presence of microplastics in freshwater environments — including remote lakes and rivers — finding that microfibers from textiles are the most commonly detected type. Since freshwater is a source of drinking water and food, its contamination with microplastics has direct implications for human health.
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