It doesn't take much to start a zebra mussel population. You can't see the small mussels in the water that can be in the bottom of your boat from being in a body of water that has them.
They can stay there for weeks and when you move to another body of water, "Presto" a new mussel population.
It's a real nasty thing. Not much you can do once you have them.
Please be careful.

Dave