That surely can have an influence, but I also beleive that ich can have different force or strength with different strain of the parasites. It is said that after about 10 generations the ich exhaust itself and disapear unless some new strain is re-introduced. It might be that some strain of ich are more nasty than others.
It's the same with bacterial infection, some fish might fight it and some might not, but when a very virulent strain of bacteria is on the loose very little can escape because it multiply too fast and get to a plague proportion.
It hapened to me with discus and discus plague. Had to treat all my fish for many days with permaganate potassium to save them but usually fish can fight off bacterias, unless you introduce a strain that is very nasty.
I guess it can be like the flesh eating bacteria. It is a bacteria often found in the environment and usualy does not cause trouble, until a strain of it start to attack people's flesh.
Just a theory
Or just like some strain of flukes have now developed a resistance to prazipro and are nearly impossible to kill whereas some strain of flukes (same specie) are killed easily.
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Originally Posted by MarkoD
and you're not willing to admit that the the scale of the infestation is determined by whether the fish are stressed or not?
I've put new fish into my tank that get covered in ich, sometimes they live, sometimes they dont. but i've never put in a new fish with ich and have it spread to the existing fish in my tank.
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