The use of a common fungal treatment in fish farming is to end following discussions between the UK and the European Commission (EC). Fish farmers are cooperating fully with the government to stop the use of the product with immediate effect. Malachite green has been used extensively by the aquaculture industries in Europe and throughout the world for many years in the absence of any authorised veterinary medicine alternative. It is reported to have proved particularly effective at protecting the welfare of farmed fish. The UK government has taken scientific advice from independent advisory committees over the past eight years on the use of this product to ensure that the interests and health of consumers are protected. However, there are continuing concerns about its potential effect on human health.