International Convention on the Control of Harmful Anti-fouling Systems on Ships

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The International Convention on the Control of Harmful Anti-fouling Systems in Ships (AFS Convention) is a 2001

organotin tributyltin is prohibited, since leaching of that chemical from the hulls of ships has been shown to cause deformations in oysters and sex changes in whelks
.

The convention was concluded in

United Nations member states plus the Cook Islands and Niue. A ratifying state agrees to enforce the prohibitions of the convention on all ships flying its flag
and on any ship that enters a port, shipyard, or offshore terminal of the state. The 81 ratifying states represent approximately 94 per cent of the gross tonnage of the world's merchant fleets.

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