17:15 〜 19:15
[HCG19-P04] Assessment of the environmental residues of microplastics and plastic additives on fish
キーワード：魚、生態毒性、リスク評価
Plastic pollution is currently one of the most serious environmental problems. Microplastic (MP) contamination has been repeatedly identified in marine and freshwater environments worldwide. To date, various field and laboratory studies have examined the influence of MP on fishes. In the laboratory, MP ingestion and uptake into the gastrointestinal tract has been observed in goldfish (Carassius auratus), zebrafish (Danio rerio), mummichog (Fundulus heteroclitus), and red seabream. In addition, MP has been identified in wild fish captured, indicating that MP ingestion by fishes is widespread.
Along with plastic pollution, the pollution caused by plasticizers is also serious, and the latter is broadly classified into phthalate and non-phthalate plasticizers. Plasticizers are additives used to enhance the flexibility of plastics and rubber, and are generally classified into phthalate and non-phthalate types based on their chemical structures. Phthalate plasticizers act as endocrine disruptors, raising health concerns, particularly in developing children. Owing to these potential impacts on human health and the environment, restrictions on their use have been implemented, especially in the European Union, United States, and Japan. Non-phthalate plasticizers are generally exhibit lower endocrine-disrupting activity, leading to increased use in fields where safety is essential, such as food packaging, medical devices, toys, and cosmetics. However, recently, certain non-phthalate plasticizers also exhibit thyroid hormone-disrupting effects in Oryzias latipes (Japanese medaka). Thus, the experimental data obtained in the laboratory suggest that MPs and plastic additives may be harmful to fish.
On the other hand, clarifying the extent to which Ms and plastic additives remaining in the environment are harmful to fish is critically important from an ecosystem conservation perspective. To evaluate their toxicity, data on environmental residual concentrations, retention time in fish, and ecotoxicological toxicity values are necessary. In this presentation, I report the findings on the environmental residual concentrations, retention times, and ecotoxicological toxicity values of MPs or plastic additives. In particular, I introduce data on environmental residual concentrations in Osaka Bay and its inflowing rivers in Japan.
Along with plastic pollution, the pollution caused by plasticizers is also serious, and the latter is broadly classified into phthalate and non-phthalate plasticizers. Plasticizers are additives used to enhance the flexibility of plastics and rubber, and are generally classified into phthalate and non-phthalate types based on their chemical structures. Phthalate plasticizers act as endocrine disruptors, raising health concerns, particularly in developing children. Owing to these potential impacts on human health and the environment, restrictions on their use have been implemented, especially in the European Union, United States, and Japan. Non-phthalate plasticizers are generally exhibit lower endocrine-disrupting activity, leading to increased use in fields where safety is essential, such as food packaging, medical devices, toys, and cosmetics. However, recently, certain non-phthalate plasticizers also exhibit thyroid hormone-disrupting effects in Oryzias latipes (Japanese medaka). Thus, the experimental data obtained in the laboratory suggest that MPs and plastic additives may be harmful to fish.
On the other hand, clarifying the extent to which Ms and plastic additives remaining in the environment are harmful to fish is critically important from an ecosystem conservation perspective. To evaluate their toxicity, data on environmental residual concentrations, retention time in fish, and ecotoxicological toxicity values are necessary. In this presentation, I report the findings on the environmental residual concentrations, retention times, and ecotoxicological toxicity values of MPs or plastic additives. In particular, I introduce data on environmental residual concentrations in Osaka Bay and its inflowing rivers in Japan.