Marine ick is certainly not something anyone of us wants to have to deal with. It was originally thought that Marine Ick only occurred in closed systems and was not present in the wild, and if so it was not present to such a degree that Marine Biologists encountered it on a regular basis.

To give you a few references you can review for both a better understsanding of this parasite (obligate) and some suggested approaches to deal with it, below are a number of links you can use to read up some more on this pesky fish pest :

http://edis.ifas.ufl.edu/fa164      Cryptocaryon irritans
http://www.chucksaddiction.com/ich.html Ick
http://www.int-res.com/articles/dao/25/d025p159.pdf Crypto in the Wild

http://www.advancedaquarist.com/2003/11/mini Bartelme Ick Part I
http://www.advancedaquarist.com/2003/12/mini Bartelme Ick Part II
http://www.advancedaquarist.com/2004/1/mini Bartelme Ick part III
http://www.advancedaquarist.com/2004/2/mini Bartelme Ick Part IV
http://www.advancedaquarist.com/2004/3/mini Bartelme Ick Part V of V

Albert