Amyloodinium ocellatum

Amyloodinium ocellatum

Amyloodinium ocellatum or Marine Velvet is a unique specimen. It is a single celled parasitic dinoflagellate that exhibits characteristics of both algae and protozoans.

Marine Velvet is a mobile free swimming ,fast-moving, highly fatal parasitic disease.

Marine Velvet must be dealt with upon arrival in a quarantine tank and or in the receiving process and needs to be done.

Below is the format overview we follow and how we present the information.

UPDATED: September 27, 2026

Identification

Rapid or labored breathing and gasping at the surface Scratching or "flashing" on objects and decorations(br> Fine, dusty, gold-to-white velvety coating on the skin, usually starts at the front
Damage done to the gills is usually the first signs
Lesions and disintegrating skin and flesh

CLASS

Protozoa

Reproduction

Cell division, multiplication at an incredible rate
Feeds on the bacteria from rotting flesh and gills
Saltwater Exclusive

Causes

Stress
Malnutrition
Poor Water Conditions

Treatments

Cooper most effective
Chloroquine / Hydroxychloroquine is effective
Acriflavine works but takes time
Fallow system for many months, doesn't always work

Observations, Notes, Remarks

This critter can photosynthesis in its free-swimming stages
Highly contagious and very rapid growth, can wipe out a tank in 2-3 days