What should I do if my goldfish grows white?
White spots on goldfish are a common problem encountered by many fish keeping enthusiasts, usually caused by parasites or water quality issues. This article will introduce in detail the causes, symptoms, treatments and preventive measures of white spots on goldfish to help you quickly solve this problem.
1. Reasons why goldfish have white spots

The main cause of white spots on goldfish is a parasitic infection called "little melon worm", commonly known as "white spot disease". In addition, deterioration of water quality, sudden changes in temperature or reduced immunity of goldfish may also induce this disease.
| Reason | Description |
|---|---|
| Small melonworm infection | Parasites attach to fish and form white spots |
| water quality issues | High ammonia or nitrite levels |
| temperature change | Sudden drop in water temperature causes stress in goldfish |
| low immunity | Malnutrition or environmental discomfort |
2. Symptoms of white spots on goldfish
The symptoms of white spot disease are more obvious. They usually appear as small white spots on the surface of the fish. In severe cases, they may cover the whole body. Goldfish also exhibit the following abnormal behaviors:
| Symptoms | performance |
|---|---|
| white spots on body surface | White particles appear on the fins, gill covers or body |
| friction objects | Goldfish frequently rub against tank walls or decorations |
| Shortness of breath | Rapid opening and closing of gills |
| Loss of appetite | Refusing to eat or eating less |
3. Treatment methods for goldfish with white spots
Once you discover white spots on your goldfish, you need to take immediate treatment measures. The following are common treatments:
| method | Operation steps |
|---|---|
| Heating method | Slowly increase the water temperature to 28-30℃ and maintain it for 3-5 days |
| salt bath | Add 1-3 grams of salt per liter of water and soak for 10-15 minutes |
| drug treatment | Use white spot net or methylene blue according to the instructions. |
| water quality regulation | Change 1/3 of the water, strengthen filtration, and keep the water clean |
4. Measures to prevent goldfish from growing white spots
Prevention is better than cure, here are some effective ways to avoid white spot disease in your goldfish:
| measures | Specific operations |
|---|---|
| Stable water temperature | Avoid excessive temperature differences and use heating rods to keep the temperature constant |
| Change water regularly | Change 1/4 of the water every week to keep the water fresh |
| Reasonable feeding | Provide nutritionally balanced feed and avoid overfeeding |
| New fish quarantine | Isolate and observe newly purchased goldfish for 1 week |
5. Things to note
Here are some things to note when treating white spot disease in goldfish:
1. The temperature must be raised slowly, no more than 1°C per hour, to avoid stress to the goldfish.
2. Use non-iodized salt during salt bath to avoid damaging the gills of goldfish.
3. Turn off the ultraviolet germicidal lamp during drug treatment to avoid affecting the efficacy of the drug.
4. If the symptoms are not relieved after 3-5 days, you need to consult a professional veterinarian in time.
6. Summary
White spots on goldfish are a common but treatable condition. With timely detection, scientific treatment and effective prevention, your goldfish will surely recover. Remember, good water quality and a stable environment are key to preventing all fish diseases!
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