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A collective term used for that group of compounds (coatings or paints), often containing metals, which are applied to structures and equipment to prevent attachment of fouling organisms; examples include tributyl tin TBT which is commonly used in shipping. Though these compounds have been used in many aquatic situations, their use in aquaculture is now regulated because of detrimental effects on molluscs as well as their accumulation in finfish, when used to treat cage netting. Other anti-foulants, using alternative chemical agents are commercially available. The latest developments include Teflon and multi-layer coatings which peel off or are self-polishing, thus allowing the removal of settled organisms without toxic action. Some of these new materials are partly bio-degradable and thus more environmentally acceptable.