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L144 Baby is to whiten then to wither and die. what is the illness? and treatment?

This is going to need more information if we're to be able to help. There are a number of parasitic and bacterial infections which will cause fish to fade and become weak or frail. Most are fairly easy to treat, but often difficult to ID on plecos due to their general anatomy.

Larry

Hi,
This is quite normal in my opinion.
About 5% of a spawn of bristlenose will die.
For the yellow / gold variety the ones that are "not going to make it" always go pale first.
Some can get to a few months old, but the ones that go pale / white will never survive.
The pale ones just are not as strong as the good coloured ones.
They never cause more of the healthy ones to die, and if a healthy one eats the corpse of a white one then the healthy one does not get sick, from eating the white one.
It is just "natural selection" as far as I can tell.
I also notice that the long fin variety appear to have a higher death rate for babies, but I have not kept any sort of data on this, just an observation based on the number of surviving babies.

Cheers