<a href=showthread.php?s=&postid=14262245#post14262245 target=_blank>Originally posted</a> by Stuart60611
If this is true, one approach may simply be to keep the fish fed well, along with maintaining high water quality and wait things out. I know that this approach may not be popular with some, but it may be the only feasible option when one has a lot of fish and insufficient means of quarantining all of the fish.
You're referring to Burgess & Matthews' failed attempt to keep an active culture going for research.
However, that approach has a few major flaws.
Ich usually results in fatality by two methods.
One is infection of the open wounds left behind by the exiting parasite, and the other is by suffocation when the parasites infest the gills in too great a number.
One flaw is that your fish may not be lucky enough to avoid either of those situations for the 6-12 months to develop a "partial immunity" or degeneration of the Ich cell line.
Another flaw is that in Burgess & Matthews case, they were keeping 7 isolates in a controlled environment, basically quarantine tanks specifically for the breeding of Ich.
In that isolated environment the individual cell lines degenerated and became unviable after 11-12 months.
This is very different from the typical aquarium environment where new fish, corals, and inverts would be coming and going over that 11-12 months possibly bringing in new cell lines of Ich,
especially if there was no QT procedure in place for any of the new additions.
As for personal experience with how long they can survive, I have had systems that were treated with alternative "reefsafe" methods that appeared to work initially, but left a low-level infestation of Ich which survived for over two years before eventually flaring up and causing a problem again.
Of course, these were regular display systems and weren't completely isolated systems like Burgess & Matthews used in their research so I don't think it can be used to prove or disprove the theory.
In any case, keeping an empty hospital or quarantine tank stashed away for new arrivals or sick fish really isn't that expensive or difficult when you consider all that we go through and how much we have invested.
I would definitely advise anyone in the hobby to seriously consider an extra 20 to 55g tank (or even a rubbermaid tub) and a cheap sponge filter to setup and use as a QT when the need arises.