Halfordian Golfer wrote:

The crux of the problem is that the zebra mussel has no
natural predators in the Great Lakes, that is to say nothing
can eat the damn things.

What you call "clarify" is what biologists call removing all
the nutrients from the very bottom of the food chain. That
wouldn't be a problem if something ate the zebra mussel and
then was itself eaten by something which was eaten by something
else and so on and so on up the chain.

HTH

--
Ken Fortenberry