Symptoms
Initially, infected fish are known to "flash," or sporadically dart from one end of an aquarium to another, scratching against objects in order to relieve their discomfort. They will also "clamp" their fins very close to their body, and exhibit lethargy. If untreated, a 'dusting' of particles (which are in fact the parasites) will be seen all over the infected fish, ranging in color from brown to gold to green. In the most advanced stages, fish will have difficulty respirating, will often refuse food, and will eventually die of hypoxia due to necrosis of their gill tissue.
Read more about this topic: Velvet (fish Disease)
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