Pearling, Testimony of an Island Economy

Toxic effects of leachates from plastic pearl-farming gear on embryo-larval development in the pearl oyster Pinctada margaritifera

Plastic pearl-farming gear releases hazardous chemicals that significantly impair the development and survival of pearl oysters (Pinctada margaritifera), a species vital to both ecosystems and economies. The study found that leachates from new plastic gear, containing high levels of phthalates and other contaminants, caused up to 86% mortality in embryos after just 48 hours of exposure, compared to 28% for aged gear. Chemical analysis identified 26 compounds, including polycyclic aromatic hydrocarbons (PAHs) and pesticides, which leach into seawater over time. These findings highlight the urgent need for better management of plastic waste in pearl-farming industries to protect lagoon ecosystems.