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Freshwater Fish Siberian Dace Ingest Microplastics in the Remote Yenisei Tributary
Summary
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.
This study analyzed microplastics in the gastrointestinal tract of Siberian dace (Leuciscus leuciscus subsp. baicalensis (Dybowski, 1874)) in the remote Yenisei tributary of the Nizhnyaya (Lower) Tunguska River (Siberia, Russia). µRaman analysis showed that 60% of the fish from two different sites had ingested plastic microparticles (on average, 1.55 ± 1.95 items per individual). The most common type of microplastic were fibers, and the most abundant size category was 300 to 1000 µm. In the studied population, no significant differences in the MP content between the two sites or between males and females were found (p > 0.05). The tendency for higher MP ingestion by Siberian dace at earlier ages (2+ and 3+) compared to later (4+ and 5+) was observed, which may be connected to the features of the fish biology and ecology.