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Disruption of energy metabolism in the Pacific oyster (Crassostrea gigas) by co-exposure to aged microplastics and pathogenic Vibrio spp
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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.
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.
Disruption of energy metabolism in the Pacific oyster (Crassostrea gigas) by co-exposure to aged microplastics and pathogenic Vibrio spp.
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Scientists found that when oysters are exposed to both aging microplastics and harmful bacteria (Vibrio) commonly found in seawater, the plastic particles act like tiny rafts that carry extra bacteria into the oysters, causing more damage and stress than either problem alone. This double threat disrupted the oysters' energy use so much that they made fewer eggs and sperm, threatening their ability to reproduce and sustain populations. Since oysters and other shellfish are a major food source for people, this research is an early warning sign that combined pollution stressors could impact seafood supplies and the marine ecosystems we depend on.
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.
Molecular and cellular effects of nano- and microplastics on oysters: a review
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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.
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