Pond Boss Forums STOCKING A NEW POND Raising Forage and Bait Ich...

Raptor - Sunil is right. This parasite pops up often in an aquarium because fish are more likely to be stressed there. Crowding, water quality (like build-up of nitrogen products), etc., all cause the fish in tanks to be more likely to become infected.

http://freshaquarium.about.com/cs/disease/p/ich.htm

It is a natural parasite, and exists naturally in the wild. More information is available from the Southern Regional Aquaculture Center. Go to their web page below, and click on their publication number 476 (white spot disease).

http://srac.tamu.edu/fulllist.cfm