Abstract
In this study, we examined microplastic contamination in the gills and guts of two filter-feeding oyster species, Crassostrea gigas, and Crassostrea nippona, in Tokyo Bay, an area of high-level MP pollution, to determine the extent of contamination. The mean (± SD) concentration of MPs in C. gigas in spring was 29.1 ± 19.9 MPs g−1 WW in the gills and 181.0 ± 229.7 MPs g−1 WW in the guts. For C. nippona, MP concentration in the gills and guts during spring was 144.5 ± 77.1 MPs g−1 WW and 149.7 ± 123.4 MPs g−1 WW respectively. In summer, C. nippona had a mean (± SD) MP concentration of 193.3 ± 66.9 MPs g−1 WW in the gills and 302.8 ± 232.1 MPs g−1 WW in the guts. MP uptake was significantly higher (p < 0.05) in C. nippona than in C. gigas in spring. Fragment was the dominant shape with a size frequency of 40–60 µm. PE was the most abundant polymer except in the gills of C. gigas, where PA was dominant. MP Polymer composition in oysters corresponded to those in the seawater.
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