Cryptocaryon Irritans This is probably the most common of the saltwater fish diseases that a hobbyist' s fish can have the displeasure of experiencing. Once the aquarist has learned to quickly recognize and correctly treat for this parasite, its bark can be worse than its bite. Cryptocaryon irritans infections usually progress much slower than Amyloodinium . If the fish are carefully observed on a daily basis, the telltale white, salt-size spots should be apparent before the infection gets out of control. Usually, some of the fish appear unaffected at the onset. Common names include the following: White Spot Disease and Saltwater Ich.
Some symptoms to look for are as follow:
White spots about the size of a printed period or pin head. The parasite is
usually noticed on the skin and fins first, and later the eyes.
Usually only some, but not all, of the fish are affected until the disease has
progressed for at least a few days.
Spots seem to be gone but come back again after a few days.
Some fish scratch but not as often or violently as seen with Amyloodinium
infections.
Shuddering or twitching
Hyperactivity in early stages
Increased breathing rate, except in early stages
Increased mucus production
Faded colors
Cloudy eyes associated with secondary bacterial infections
Staying near the surface or in areas of high water flow
Lack of appetite in advanced stages
Hiding
Fin rot or other secondary bacterial infection in late stages
Multi-focal, de-pigmented skin erosions
Dehydration and rapid weight loss in late stages
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