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Microplastics in oysters (Crassostrea gigas) and water at the Bahía Blanca Estuary (Southwestern Atlantic): An emerging issue of global concern
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Microplastics Uptake and Egestion Dynamics in Pacific Oysters, Magallana Gigas (Thunberg, 1793), Under Controlled Conditions
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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.
Physiological impacts of microplastics on the Pacific oyster Crassostrea gigas: The role of particle size and concentration
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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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Researchers quantified microplastics in blue mussels and eastern oysters at 13 locations across Nova Scotia, Canada, finding average concentrations of roughly 4 particles per gram of tissue, with higher contamination near Halifax and aquaculture areas. Because mussels and oysters are widely consumed whole, these findings confirm meaningful human dietary microplastic exposure from commercially farmed and wild shellfish at concentrations associated with oxidative stress and metabolic disruption in laboratory studies.
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