ABS

Cybutryne, also known under its industry name Irgarol-1051 is applied to hulls of ships as an anti-fouling agent with generic antifouling benefit by inhibiting the electron transport in algae and plants. As an increasing number of studies have become available on the environmental and ecological impacts of cybutryne, together with an equally increasing number of environmental risk assessment evaluations, the toxicity and persistence of this substance has been determined, in some instances even more harmful than tributyltin (TBT). It has been shown to be highly persistent in the environment, accumulating in the sediment and causing long-term effects in the marine environment. This has been demonstrated to be especially true for non-target and non-fouling marine algae that are highly sensitive at extremely low concentrations of the substance. This is particularly critical, as algae are considered the pillar for the ecosystem structure and function as they provide the food base for most marine food chains.

https://ww2.eagle.org/content/dam/eagle/regulatory-news/2023/ABS%20Regulatory%20News%20-%20AFS%20Convention%20-%20Ban%20on%20Cybutryne%20in%20Hull%20Coatings.pdf