Marine Velvet / Amyloodiniosis

About this condition

Caused by the parasitic dinoflagellate Amyloodinium ocellatum, this disease presents as a fine golden-brown to gray dusting on the fish's skin, resembling sprinkled pepper. It progresses faster than marine ich and can be fatal if not addressed promptly.

Common symptoms

• Fine golden-brown to gray pepper-like dusting on the skin
• Vigorous flashing behavior (rubbing body against objects)
• Gill swelling and respiratory distress (rapid mouth movement)
• Rapid deterioration and loss of appetite

Common causes

• Infestation by Amyloodinium ocellatum (marine velvet parasite)
• Introduction of new fish without quarantine treatment
• Stress from water quality deterioration or temperature fluctuations
• Spread from existing infection sources within the tank

Prevention (husbandry & daily care)

Always quarantine new fish for 2-4 weeks before introduction. Maintain stable water temperature, quality, and salinity, and avoid overcrowding to reduce stress.

Related species guide

When to see a vet

What can a specialist store do?

Since veterinary clinics with marine fish experience are limited, prompt consultation with a specialist marine aquarium store or experienced aquarist is recommended. Guidance on isolation protocols, treatment options, and main tank management procedures can be obtained.

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Other conditions in this animal

The same condition in other animals