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Microplastic pollution in clam (Meretrix Lyrata Sowerby, 1851) at Mekong Delta river, Vietnam
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Researchers found microplastics in clam tissue samples from four aquaculture sites in the Mekong Delta, Vietnam, with concentrations varying by location and month. The findings raise concerns about microplastic exposure for Vietnamese consumers who eat these widely farmed shellfish.
The problem of microplastic pollution (<5 mm) is becoming one of the biggest challenges facing countries. One of the problems is the export value of seafood products. Therefore, to assess the microplastic accumulation in clam (Meretrix lyrata), this study investigated the concentration of microplastics (MPs) in clam and their habitat in four clam culture beds (Tan Thanh, Ba Tri, Ganh Hao, and Ba Dong) in three consecutive months (from January to March 2020). The samples were analyzed by the method of oxidation of organic compounds and MPs flotation solution. The result showed that the concentrations of MPs in all three types of samples (seawater, surface sediment, and clam tissues respectively 36,66 ± 11.94 items 1 L- of seawater; 169.34 ± 42.01 items 1 kg- of soil; 13.79 ± 1.06 items individual- 10 g-, w.w) were markedly different between the four clam culture beds in three months (p-value <α = 0.05). Among which, the natural clam culture at Ganh Hao beach had the lowest concentration of MPs compared to Tan Thanh, Ba Dong, and Ba Tri cultured beds by households. Furthermore, the concentration of MPs in March was also the lowest compared to January and February. Hard plastic fibers were found the most (> 50%) compared to other types of plastic. The conclusion that microplastics have appeared everywhere in the environment and were found in the organism of clam, affecting the life of aquatic organisms.
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Researchers conducted the first study of microplastic contamination in the freshwater clam Corbicula baudoni from the Mekong River Delta in Vietnam. They monitored both small and large clams monthly and found microplastics present in the organisms. The findings raise concerns about microplastic transfer through freshwater food chains and potential human exposure through shellfish consumption in the region.
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Microplastics are abundant in mangrove sediments in Vietnam, with particles averaging 0.35 per gram of tissue in hard clams (Meretrix lyrata). Since clams are widely eaten, this finding raises concerns about human ingestion of microplastics through seafood from coastal ecosystems.
Assessment of Microplastics Contamination in Commericial Clams in the Coastal Zone of Vietnam
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Microplastic contamination was assessed in commercially harvested clams from aquaculture farms in coastal Vietnam, a country where microplastic impacts on aquaculture are poorly understood. Both vertebrates and invertebrates in coastal areas were found to ingest microplastics, raising concerns about food safety in Vietnamese seafood.
Abundance of Microplastics in Two Venus Clams (Meretrix lyrata and Paratapes undulatus) from Estuaries in Central Vietnam
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Microplastics were found at 2.17-5.36 items per gram in two edible bivalve species from Da Nang estuaries in Vietnam, with fibres dominant at 300-1500 microns, and estimated consumer intake from clam consumption of approximately 2489 microplastic items per person per year.
Microplastic contamination in Bivalves: An assessment of potential health risks to humans and bivalves in the Tam Giang Lagoon
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Researchers analysed microplastic contamination in three bivalve species from Tam Giang Lagoon in Vietnam, finding 291 MP particles across 36 specimens, with clams showing the highest burden (67% of total MPs). The findings indicate significant human dietary MP exposure from lagoon bivalves and call for monitoring of this food source.
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