Nucella lapillus imposex has been monitored in Ria de Aveiro (Portugal) in order to understand the evolution of organotin (OT) pollution after the EU ban on OT-based antifouling systems (OT-AFS). A rapid decrease of imposex occurred, but a countercurrent tendency upsurged recently (2018–2019) with a slight increase of imposex at some sites, instead of a continuous decline towards a complete recovery. In 2018 the vas deferens sequence index ranged between 0.6 and 1.0 across stations and the percentage of females with imposex varied from 63 to 100%. In 2019 these parameters varied between 0.4 and 1.0 and 37–100%, while the concentration of butyltins (TBT, DBT, MBT) in the dogwhelk tissues were < 1 ng Sn g-1 dw. Although N. lapillus imposex levels are low they are indicative of OT pollution. The full recovery of N. lapillus imposex in the future is uncertain and a cause for concern.

为了了解欧盟禁止使用基于OT的防污系统（OT-AFS）之后，在西班牙的Ria de Aveiro（葡萄牙）对Nucella lapillus imposex进行了监测，以了解有机锡（OT）污染的演变。爆发力迅速下降，但最近（2018-2019年）逆流趋势有所上升，某些地点的爆发力略有增加，而不是朝着完全恢复的方向持续下降。在2018年，各个站点的输精管序列指数范围在0.6到1.0之间，有感染的女性百分比从63％到100％不等。在2019年，这些参数在0.4到1.0到37-100％之间变化，而在w状组织中丁基锡（TBT，DBT，MBT）的浓度小于1 ng Sn g-1 dw。尽管尼古拉杆菌皮疹的水平低，表明OT污染。未来能否完全治愈天疱疮奈瑟氏球菌尚不确定，值得关注。