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Pearl farming micro-nanoplastics affect both oyster physiology and pearl quality
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Microplastics shed from pearl farming equipment accumulate in lagoon waters and, even at low concentrations, disrupt the energy metabolism, immune function, and reproductive biology of pearl oysters over a 5-month production cycle. Pearl quality was measurably degraded, meaning plastic pollution from aquaculture gear creates a feedback loop that harms the very industry generating it. This highlights a practical economic incentive — beyond ecological concern — for reducing plastic use in mariculture.
Abstract Pearl farming is the second most important economic resources of French Polynesia. However, rearing structures are an important source of plastic waste and the widespread contamination of pearl farming lagoons by microplastics has led to questions about risks for the pearl industry. The aim of this study was to test the effects of micro-nanoplastics (MNPs) on the pearl oyster ( Pinctada margaritifera ) over a 5-month pearl production cycle by closely mimics environmental scenarios. MNPs were produced from plastic pearl farming gear and used at concentrations (0.025 and 1 µg L–1) that oysters may encounter in lagoons to decipher biological and functional responses using integrative approaches. MNP exposure led to the alteration of energy metabolism, mostly driven by a lower assimilation efficiency of microalgae, with modulation of gene expression patterns. A module gene expression was strongly correlated with physiological parameters impaired by MNP conditions. Expression of key genes was suggested to be highly conserved in pearl oyster tissues (mantle, hemocytes and pearl sac) and may be used as potential environmental proxies to assess nutritional-MNP stress conditions of cultured oysters. Pearl biomineralization was also impacted by thinner aragonite crystals, with harvest marked by the presence of abnormal biomineral concretions, called keshi pearls. These experimental results demonstrated that MNPs threaten oyster physiology, with potential detrimental effects on pearl quality. Ecological approaches are now required to test the holistic impact of MNPs on population maintenance and sustainability in the Polynesian pearl industry in the context of the exposome and global climate change.
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Pearl farming micro-nanoplastics affect both oyster physiology and pearl quality
AI summary Read the abstract
Researchers exposed pearl oysters in French Polynesian lagoons to micro- and nanoplastics shed from pearl farming equipment itself, and found that even environmentally realistic concentrations disrupted energy metabolism and reduced how efficiently the oysters absorbed food from algae. After five months of exposure, both oyster health markers and pearl quality were measurably degraded. This shows that plastic pollution in aquaculture settings can undermine the very industry it contaminates, linking environmental and economic harm.
Pearl Farming Micro-nanoplastics Affect Oyster Physiology and Pearl Quality
AI summary Read the abstract
Pearl oysters (Pinctada margaritifera) exposed to micro-nanoplastics shed from plastic pearl farming equipment showed disrupted energy metabolism, reduced assimilation of microalgae food, and impaired pearl quality over a five-month production cycle. The study is notable because it tested environmentally realistic plastic concentrations, linking the industry's own plastic infrastructure to measurable biological harm in the farmed animals.
Pearl farming micro-nanoplastics affect both oyster physiology and pearl quality
AI summary Read the abstract
Pearl oysters (Pinctada margaritifera) in French Polynesia were exposed to micro-nanoplastics derived from actual farming equipment over a five-month production cycle, and the plastics disrupted the oysters' energy metabolism and altered the crystal structure of growing pearls. The study demonstrates that microplastic contamination in lagoons poses a real economic threat to the pearl industry alongside its ecological impacts.
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Researchers studied how micro- and nanoplastics from weathered pearl farming equipment affect oyster health and pearl quality in French Polynesia. Even at very low concentrations, the plastic particles reduced the oysters' ability to absorb nutrients and altered gene expression related to shell formation. The findings raise concerns that plastic pollution from farming equipment could threaten pearl quality and the long-term viability of the pearl industry.
Pearl Farming Micro-Nanoplastics Affect Oyster Physiology and Pearl Quality
AI summary Read the abstract
Pearl farming plastic gear was found to generate micro-nanoplastics (0.4-200 um) that affect pearl oyster (Pinctada margaritifera) physiology and pearl quality over a 5-month production cycle. The study closely mimicked real ecological conditions to assess risks to the pearl farming industry in French Polynesia.
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