Thao Huynh Van, Chuyen Bui Thi, Toan Pham Van, Nam Tran Sy, Cong Nguyen Van
College of Environment and Natural Resources, Can Tho University, Vietnam.
United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, Japan.
Environ Anal Health Toxicol. 2023 Dec;38(4):e2023027-0. doi: 10.5620/eaht.2023027. Epub 2023 Dec 28.
Fenobucarb is one of most common insecticides applied to rice crops in the Vietnamese Mekong Delta. Paddy fields are preferred habitats for snakehead fish (Channa striata). Therefore, the probability of exposure risks and growth effects is highly. This paper aimed to examine the effects of using fenobucarb based - Excel Basa 50EC on the brain cholinesterase (ChE) of snakehead fish. Two rice fields, in which a single dose of Excel Basa 50EC was applied to one field, whilst the other acted as a control. Each field was subdivided into three plots by earthen dikes. In each plot, one fish cage (1.2 m x 1.2 m x 1.2 m) was installed that was stocked with 20 snakehead fish. The Excel Basa 50EC was applied once at the indication dose. The results highlighted that the concentration of fenobucarb in water at 1 hr after application was 116.72 ppb ± 12.64, which decreased to 23.96 ± 6.61 ppb after d and then to below detection limits (0.02 ppb). For fish living in this field, no mortality was seen, but ChE was significantly inhibited for 31 % on the first day and recovery following 7 days of exposure. Residues of fenobucarb in soil and fish should also be investigated furthermore.
仲丁威是越南湄公河三角洲用于稻田的最常见杀虫剂之一。稻田是黑鱼（条纹鳢）的首选栖息地。因此，接触风险和生长影响的可能性很高。本文旨在研究使用基于仲丁威的Excel Basa 50EC对黑鱼脑胆碱酯酶（ChE）的影响。选取两块稻田，在其中一块稻田施用单剂量的Excel Basa 50EC，另一块作为对照。每块稻田通过土堤细分为三个地块。在每个地块中，安装一个鱼笼（1.2米×1.2米×1.2米），每个鱼笼放养20条黑鱼。Excel Basa 50EC按指示剂量施用一次。结果表明，施用后1小时水中仲丁威的浓度为116.72 ppb±12.64，4天后降至23.96±6.61 ppb，然后降至检测限以下（0.02 ppb）。对于生活在该稻田的鱼，未观察到死亡情况，但第一天ChE受到显著抑制，抑制率为31%，暴露7天后恢复。仲丁威在土壤和鱼中的残留情况还需要进一步研究。
