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Microplastics in Different Tissues of Five Common Fishes from Yuehai Lake: Accumulation, Characterization, and Contamination Assessment
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Researchers examined microplastic contamination in the gills and digestive tracts of five fish species from a Chinese lake, finding that fish eating a wider variety of foods accumulated more particles. Different plastic polymer types dominated in different tissues, confirming that microplastics move through freshwater food webs and reach fish that humans consume.
Microplastic (MP) pollution in freshwater ecosystems poses growing threats to biodiversity and human health.This study employed laser direct infrared imaging (LDIR) to analyze MP contamination in gills and gastrointestinal tracts (GIT) of five fish species (n=100) from Yuehai Lake, China.Results revealed significantly higher MP loads in omnivorous species compared to carnivorous counterparts, with GIT containing greater MP abundance than gills.MP characteristics exhibited tissue-specific patterns: fibers dominated gill samples (64.32%) while fragments prevailed in GIT (50.50%).Size distribution analysis showed >80% of MPs measured 20-100 m.Polymer composition differed markedly between tissues, with fluoroelastomer (FKM, 17.87%) and polyvinyl chloride (PVC, 17.79%) predominant in gills, versus polyethylene terephthalate (PET, 18.74%) and chlorinated polyethylene (CPE, 17.63%) in GIT.Pollution indices (11) confirmed significant ecological contamination.These findings provide crucial evidence of MP pollution pathways in freshwater food webs and highlight potential risks to ecosystem integrity and public health.
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Researchers examined microplastics in the digestive tracts of four fish species from Dianshan Lake, China. Microplastics, mostly fibers, were found at low levels in all species, with no link between contamination and the fish's diet level, though fish with more varied diets had more types of plastic and generally poorer body condition.
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Researchers systematically characterized microplastics in 19 fish species from the Yellow Sea coast of China, finding plastic retention in 34% of individual fish sampled, with fibers dominating and significant variation in microplastic load by species and habitat.
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This first-ever biomonitoring study of the Chishui River in China found microplastics in all 31 fish species examined, with an average of about 240 particles per gram in both gills and intestines. Bottom-dwelling fish accumulated significantly more microplastics than those swimming near the surface, and the fish contained twice as many plastic polymer types as were found in the surrounding water and sediment. The widespread contamination of freshwater fish with microplastics raises concerns about human exposure through fish consumption.
Accumulation of microplastics in fish guts and gills from a large natural lake: Selective or non-selective?
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Researchers studied microplastic accumulation in the guts and gills of 11 fish species from Lake Chao in China to determine whether fish selectively take up certain types of plastic particles. The study found that fish guts showed selective accumulation patterns influenced by feeding behavior, while gills accumulated microplastics more randomly through water filtration. This suggests that fish gills could serve as useful indicators of real-time microplastic pollution levels in freshwater environments.
Occurrence and accumulation of microplastics in commercial fish in the coastal waters of the Lvsi fishing ground in China
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Researchers examined microplastics in the gills and guts of 11 commercial fish species from a Chinese coastal fishing ground, finding that over 85% of fish contained microplastics in these tissues at levels of roughly 2–3 pieces per fish. PET fibers with a blue color were most common, and microplastic abundance did not increase with trophic level, suggesting limited biomagnification in this food web. Because many of these fish species are consumed by humans, understanding their microplastic loads is directly relevant to assessing human dietary exposure.
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