For what it's worth, the same thing happened at Herrington several years prior to them disappearing from Cumberland.

I think it was sometime back in the 80's.

It all happened in about the span of a year. A few whites were found floating here and there, but it was assumed that the majority of the die-off sank rather than floated up.

At any rate, they basically vanished.

they made a bit of a rebound and there are still some whites in Herrington, but nothing, not even close, like they were before die off.

SAM