Velvet Disease (Oodinium)
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About this condition
A parasitic infection caused by Oodinium (a dinoflagellate) that attaches to the body surface, producing fine yellow-to-golden dust-like spots across the entire body. It progresses rapidly and is highly contagious, making early detection and prompt isolation essential.
Common symptoms
- Yellow to golden dust-like spots spreading across the body surface
- Fish rubbing against substrate or decorations
- Rapid or labored breathing with fast gill movement
- Loss of appetite and lethargy
- Excessive mucus production and scale loss in advanced cases
Common causes
- Oodinium (dinoflagellate parasite) infection
- Introduction from newly acquired fish without quarantine
- Sudden water temperature changes or stress causing weakened immunity
- Inadequate quarantine procedures
- Overcrowding leading to water quality deterioration
Prevention (husbandry & daily care)
Always quarantine new fish in a separate tank for 2–4 weeks, avoid sudden water temperature changes, and minimize stress. Maintaining stable water quality through proper filtration and regular water changes is equally important.
Related species guide
→ Browse the species guide for this animalWhen to see a vet
Consult a specialist store or experienced keeper promptlyWhat can a specialist store do?
A specialist aquarium store or experienced keeper will assess the stage of infection and advise on isolation, water quality management, and temperature stabilization. Because the disease spreads rapidly to other fish, early consultation upon noticing any abnormality is strongly recommended. Experienced keepers prioritize isolating affected fish and reviewing the overall tank environment as the first response.
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