Spring:
1) Observe fish carefully in early spring. After a long severe winter, this is when your fish are at there weakest. Parasites and pathogenic bacteria will affect a weak fish much easier than a strong healthier one.
2) Treat pond with a course of parasite treatment as the water reaches 12°C / 54F. A malachite and formalin or general anti-parasite treatment will reduce the risk of parasite infestation on already weakened fish.

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Ask in store for advice and dosages.

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Autumn:
1) To stop parasites killing your fish, as the weather gets colder. An Autumn parasite treatment can help reduce the risk of fish loses and keep your
fish healthy throughout winter.
2) Treat pond with a course of parasite treatment before pond temperatures get to below 10 degrees, so the treatment works effectively. A malachite and formalin or general anti-parasite treatment will reduce the risk of parasite infestation on fish.

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Ask in store for advice and dosages.