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Eastern oyster (Crassostrea virginica) shows physiological tolerance to polyester microfibers at environmental concentrations
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Laboratory experiments on Pacific oysters exposed to microplastics of varying sizes and concentrations found decreased survival rates, increased oxygen consumption, and histological damage to digestive and gill tissues, with effects scaling with concentration. Oysters are global seafood staples and efficient bioaccumulators, meaning physiological damage at environmentally relevant concentrations translates directly into concerns about both aquatic ecosystem health and the safety of oysters in the human diet.
Do Environmentally Relevant Concentrations of Microplastics Pose a Threat to the Eastern Oyster, Crassostrea Virginica?
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This study exposed eastern oysters to polyester microfibers at environmentally realistic concentrations for 45 days, finding that even low doses affected their physiology including feeding, growth, and energy use. The results suggest that ecologically relevant microplastic levels may pose a threat to commercially important filter-feeding shellfish.
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Researchers exposed the oyster Crassostrea gasar to environmentally sourced polyester microfibers at 0.5 mg/L and found accumulation in gill and digestive gland tissues, with evidence of clearance after a depuration period, raising concerns about microfiber effects on bivalve aquaculture.
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Researchers reviewed the ecotoxicological effects of nano- and microplastics on oysters, finding that while high concentrations cause measurable physiological and cellular harm, there is a critical lack of studies at environmentally realistic exposure levels needed to accurately predict ecological consequences.
The impacts of PVC microplastics on physiology and transcriptomic responses of pearl oyster Pinctada fucata martensii
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Pearl oysters (Pinctada fucata martensii) exposed to PVC microplastics for 10 days showed elevated superoxide dismutase activity and significant transcriptomic changes across multiple biological pathways, with oxidative stress partially reversing during a 6-day recovery period. The disruption of antioxidant defenses and broad gene expression changes in commercially farmed oysters at environmentally relevant PVC concentrations raises concerns about microplastic impacts on aquaculture productivity and the safety of shellfish consumed by humans.
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