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Microplastics of Biodeposition by Cultured Oysters are Greatly Underestimated: A Neglected Source of Microplastics in Offshore Sediments
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Researchers studied how Pacific oysters (Magallana gigas) ingest and egest microplastics under controlled conditions, finding that ingestion rates were rapid and dose-dependent while egestion was slower, resulting in temporary accumulation that increases the oysters' exposure to adsorbed pollutants and pathogens during the retention period.
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Researchers found that oysters exposed to microplastic concentrations above 5 mg/L showed significantly reduced feeding and filtration rates, with higher concentrations causing greater disruption, suggesting that microplastic pollution could impair the health and ecosystem function of commercially and ecologically important shellfish.
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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.
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