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Microplastics in fish gut, first records from the Tom River in West Siberia, Russia
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This preliminary study found an average of 204 microplastic particles per fish in the digestive tracts of 13 dace sampled from the Tom River in West Siberia, Russia — the first such record from this region. Most particles were irregular fragments, with sizes under 0.5mm, suggesting that microplastic contamination has reached remote Siberian river systems.
This preliminary study investigated the abundance of microplastic particles in gastrointestinal tracts of the dace (Leuciscus leuciscus L.) from the Tom River, a large tributary of the Ob River in West Siberia. A total of 13 dace specimens of 2+ to 4+ years of age were studied. Microplastic particles extracted from fish guts were counted and classified by shapes and sizes. In average 204 ± 28.7 items of microplastics were detected for one dace specimen. Microplastic particles were categorized as fragments of irregular shape (70%), spheres (16%), films (7%) and fibers (7%), with size ranging from <0.15 to 2.00 mm. The vast majority of detected microplastic particles (almost 80%) were less than 0.15 mm by their largest dimension. These data provide the first evidence of microplastics in fish from the Ob River system.
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Researchers analyzed microplastics in the gastrointestinal tracts of Siberian dace fish from the remote Nizhnyaya Tunguska River (a Yenisei tributary in Siberia) using micro-Raman spectroscopy. Sixty percent of sampled fish had ingested microplastics at an average of 1.55 items per individual, with fibers and particles in the 300-1000 micrometer size range predominating, and younger fish (age 2+ and 3+) showing a tendency for higher ingestion.
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Researchers conducted a preliminary survey of microplastic concentrations in surface water of the Ob and Tom Rivers in western Siberia, finding averages of 44.2-51.2 items per cubic meter with over 93% of particles smaller than 1 mm, establishing baseline data for Arctic-flowing Russian rivers that were previously unmapped for microplastic pollution.
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Researchers found microplastic concentrations of 1.20 to 4.53 items/m³ in surface water and up to 543 items/kg in bottom sediments of the Nizhnyaya Tunguska River, a remote Yenisei tributary in Siberia, with concentrations likely originating from local human activity and increasing downstream.
Microplastic Content in the Gastrointestinal Tract of Some Fish Species of Lake Kubenskoe (Vologda Oblast)
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Researchers quantified microplastic content in the gastrointestinal tracts of perch, roach, and bream from Lake Kubenskoe in the Vologda region of Russia, representing the first evidence of microplastic contamination in fish from Vologda Oblast water bodies. MPs were detected in 60% of bream and 43% of perch individuals but not in roach, with average loads of 1.6 particles per bream and 4.2 particles per perch, predominantly in fiber form.
Microplastic ingestion by fish with different feeding habits in the Ob and Yenisei Rivers
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Microplastic particles (0.15-5.0 mm) were found in 62% of 141 freshwater fish examined from the Ob and Yenisei rivers in Siberia, with prevalence ranging from 18.5% in Yenisei perch to 92.6% in Ob ruffe. Fibers accounted for up to 99.7% of all detected particles across the three fish species studied.
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