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.

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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.


A veterinary medicine alternative to malachite green called “Pyceze” has now been developed in the UK with the assistance of funding from the salmon and trout industries and the department of the environment, food and rural affairs (Defra).


The active ingredient of this new product, “bronopol,” was permitted by the EU for use in the treatment of fish for the first time last year. The Veterinary Medicines Directorate has granted a provisional marketing authorisation for Pyceze and they are currently assessing the suitability of the product for full marketing authorisation. In the meantime Pyceze is available for the treatment of fish and their ova under veterinary prescription.


The EC is being kept fully informed of the arrangements for withdrawing use of malachite green in the UK. The EC is also considering the situation in other member states and in countries exporting farmed fish into the EU.

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