* Ichthyophthirius multifiliis: This is a parasitic infection commonly known as "Ich". It is caused by a protozoan that attacks the skin and fins of fish. Ich can cause white spots to appear on the body and fins of goldfish.
* Columnaris: This is a bacterial infection that can affect goldfish. Columnaris can cause white patches to appear on the body and fins of goldfish.
* Lymphocystis: This is a viral infection that can affect goldfish. Lymphocystis can cause white wart-like growths to appear on the body and fins of goldfish.
* Nutritional deficiencies: A lack of certain nutrients, such as vitamin C, can cause goldfish to turn white.
* Stress: Stress can also cause goldfish to turn white. Stress can be caused by a variety of factors, such as overcrowding, poor water quality, or a change in environment.
If you notice that your goldfish is turning white, it is important to take action to identify and treat the cause. If you are not sure what is causing the problem, you should take your goldfish to a veterinarian for diagnosis and treatment.