It was believed that the only inducer of imposex was tributyltin (TBT),[1] which can be active in extremely low concentrations, but recent studies reported other substances as inducers, such as triphenyltin[2] and ethanol.[3] Tributyltin is an anti-fouling agent for boats which affects females of the species Nucella lapillus (dog whelk), Voluta ebraea (the Hebrew volute),[4] Olivancillaria vesica,[5] Stramonita haemastoma[6] (red-mouthed rock shell) and more than 200 other marine gastropods.