Environmental risk assessment of fluorine insecticides in surface waters: occurrence and toxicity to mysid crustaceans, Americamysis bahia

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K05878
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 41050:Environmental agriculture-related
• Research Institution: Ariake National College of Technology
• Principal Investigator: Uchida Masaya 有明工業高等専門学校, 創造工学科, 准教授 (80575267)
• Co-Investigator(Kenkyū-buntansha): 石橋 弘志 愛媛大学, 農学研究科, 准教授 (90403857) ; 平野 将司 東海大学, 農学部, 特任准教授 (20554471) ; 水川 葉月 愛媛大学, 農学研究科, 准教授 (60612661)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 海産甲殻類 / アミ / フッ素系殺虫剤 / 生態毒性 / 化学分析

Outline of Final Research Achievements

In this study, we examined the occurrence and geographical distribution of fluorine insecticides in marine environments and evaluated their toxic effects on the mysid crustacean, Americamysis bahia. Throughout the study period, the occurrence, levels, and seasonal variations of fipronil (Fip) and its degradation products in rivers and estuaries in Fukuoka Prefecture were clarified. Furthermore, acute toxicity, growth, and fecundity tests were performed to evaluate the biological effects of fluorine insecticides on mysids. These studies have demonstrated that mysids are highly susceptible to fluorinated insecticides, which lead to impaired growth and maturation at concentrations comparable to those found in the environment. The molt-disrupting effects of Fip-Sf and its molecular mechanisms of action have been elucidated. These results provide insights into the environmental pollution caused by fluorine insecticide contamination of marine waters.

Free Research Field

生態毒性学

Academic Significance and Societal Importance of the Research Achievements

本研究の成果から、海域におけるフッ素系殺虫剤の汚染実態解明と環境リスクを評価することが出来た。また、フッ素系殺虫剤が海産甲殻類アミに影響を及ぼす濃度を把握し、脱皮かく乱などの作用とその作用メカニズムの一端を明らかにした。このことは海産生物を用いた試験法開発に重要な基礎情報を提示できたことに加え、農薬登録保留基準の設定やその用途から淡水生物での評価に限られていた農薬類の海産生物への影響評価にも大きく貢献することから、環境保全行政の観点からも社会的意義は大きい。