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Microplastic ingestion in important commercial fish in the southern Caspian Sea
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Researchers examined microplastics in the digestive systems of two commercial fish species (Chelon aurata and Rutilus kutum) responsible for over 50% of Caspian Sea catch, documenting the extent of contamination in fish destined for human consumption.
The ubiquitous distribution of microplastics (MPs) across marine habitats has led to an increased investigation of their potential impacts on the marine food chain and consequent human exposure. The two fish species Chelon aurata and Rutilus kutum that account for over 50% of the total catch in the Caspian Sea were assessed relative to the presence of MPs in their digestive system. Samples were collected from 6 stations in the southern Caspian Sea from February to March 2017. MPs were reported to be present in 67.56% of the 111 individuals analyzed, with an average concentration of 2.29 MP/Fish; the majority were fibers (≈50%) and fragments (≈30%). The baseline data have become more relevant since the population in the region has consumed the whole fish. The presence and prevalence of MP in the two commercially important fish in the Caspian Sea warranted a comprehensive assessment in the water column, marine sediments, and fish from the different trophic levels as over 130 rivers drain into the water body.
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This study found microplastics in the digestive tracts of commercial Kutum fish (Rutilus frisii kutum) from the Caspian Sea, with fibers being the most prevalent type, raising concerns for human exposure through seafood consumption.
Assessment of microplastic contamination in some commercial fishes of the southern Caspian Sea and its potential risks
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Researchers examined microplastic contamination in the digestive tracts of 384 fish from four species collected across 11 sites in the southern Caspian Sea. Evidence indicates that nearly 69% of fish contained microplastics, with fibers being the most common type, highlighting widespread plastic pollution in this important inland sea and potential risks to both aquatic life and human seafood consumers.
Microplastic contamination in the gastrointestinal tract of Caspian kutum (Rutilus kutum) from Miankaleh fishing grounds: Implications for ecosystem and human health
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Researchers examined microplastic contamination in Caspian kutum (Rutilus kutum) from three fishing grounds along Iran's Miankaleh coastline, finding MPs in 93.7% of fish — predominantly fibres from textiles and fishing gear — with contamination levels highest near the Gorganrud River, raising food safety concerns for a commercially important species.
Microplastic Pollution in the Gastrointestinal Tract and Gills of Some Teleost and Sturgeon Fish from the Caspian Sea, Northern Iran
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Researchers found microplastics in the gastrointestinal tracts and gills of three teleost fish species and one sturgeon from the Caspian Sea in northern Iran, with mean counts ranging from 1.0 to 2.8 microplastics per fish. This is the first report documenting microplastics in sturgeon from the Caspian Sea, highlighting contamination of commercially and ecologically important fish.
Microplastic fibers in the gut of highly consumed fish species from the southern Caspian Sea
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Researchers assessed microplastic contamination in the guts of three highly consumed fish species from the southern Caspian Sea. They found that fibers were the only shape of microplastics detected, with leaping mullet showing the highest frequency, and that black-colored polystyrene, polypropylene, and polyethylene terephthalate were the dominant polymer types across all species.
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