This is the commonest disease of pond fish. The spores of Achyla and Saprolegniaare in the water of your pond, but will not attack the fish if the protective mucus layer on the surface Is intact and the immune system of the fish Is working. This immunity breaks down when the skin has been damaged or the fish Is under stress due to rapid temperature change, spawning, etc. Fungus is easily recognised as cotton-wool like growths anywhere on the fish. If caught early it is quite easy to treat — you will find several fungicides on the shelves of your aquatic supplier for an in-tank treatment.

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