12, 2015 7:06 am
Generally speaking, a mutation does not weaken an animal, but in order to show, the mutation should in most cases be homozygous, that is, inbreeding will help showing it
Inbreeding is what makes animals weak
If one were inclined to produce strong albinos or blue fishes (which I'm certainly not, I prefer the real fishes) one could cross a mutated fish with a normal, strong fish. The offspring will look normal, but carry the mutation. these fish are heterozygous for this mutation
Were one to do this several times, with unrelated normal fishes, the heterozygous pools could be interbred, resulting in 1 out of 4 mutated fish, which could be just as healthy as the others.
But this would take at least 2 pairs of mixed parents, and in order to have a really healthy strain, one would like to have it even broader.
I don't think any hobbyist would take the effort. And commercially? Commercially it is, sadly, more profitable to produce unhealthy fish which die sooner.