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Global Warming Potential and Waste Handling of Pearl Farming in Ago Bay, Mie Prefecture, Japan
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This life cycle assessment evaluated the carbon footprint and waste management practices of pearl farming in Japan's Ago Bay. While focused on aquaculture, the study addresses the use of plastic equipment in marine farming operations and the environmental cost of its disposal.
Pearl farming (PF) represents a significant portion of the world’s total aquaculture production and is a growing multibillion-dollar sector of mollusk aquaculture. However, PF in Mie Prefecture, Japan, has resulted in the deterioration of environmental conditions in Ago Bay, and its environmental impacts are yet to be evaluated using a life-cycle assessment (LCA). Thus, in this study, a cradle-to-gate LCA using 1 kg of pearl produced in Ago Bay was conducted. The key results showed that the global warming potential (GWP) was equivalent to 4.98 kg CO2, which is lower than the GWPs of metals, such as gold and silver, commonly used in jewelry production. Meanwhile, the waste handling of PF is progressing, with current efforts being focused on extracting calcium carbonate, exporting shell waste, and reducing plastic waste. These findings provide critical insights for achieving sustainable pearl production aquaculture.
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Assessment of plastic waste generated by the aquaculture industry: The case study of pearl farming in French Polynesia
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Pearl farming in French Polynesia, a major local industry, generates about 1,600 tons of plastic waste every year from the gear used to grow pearls, and researchers found that 75% of it isn't disposed of properly, with nearly half at risk of washing into the ocean. As that plastic breaks down in seawater, it can become microplastics that enter the marine food chain, meaning the pearls, fish, and seafood harvested from these waters could carry plastic contamination back to our dinner plates.
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.
Microplastics contamination in pearl-farming lagoons of French Polynesia
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Microplastic contamination was documented in pearl-farming lagoons of French Polynesia, establishing a pollution baseline for these economically important tropical ecosystems and identifying local aquaculture activities as a contributing source.
Pearl Farming Micro-nanoplastics Affect Oyster Physiology and Pearl Quality
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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.
Recherche D’especes Bioindicatrices De La Pollution Plastique Dans Un Contexte Perlicole En Polynesie Française
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Researchers investigated bioindicator species for plastic pollution in the context of pearl aquaculture in French Polynesia, where the shift from natural to plastic materials since the 1990s has introduced large quantities of plastics into lagoon environments with inadequate waste management. The study identified candidate organisms that accumulate or respond to plastic contamination in pearl farm settings, offering a biological monitoring tool for this economically significant and ecologically sensitive coastal industry.
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