To answer a couple of your questions. Per Jay Rowan DFG there has been 2 boats that have had adult size quagga's stopped at Tahoe. I know its hardly anything. but hey you asked. I am unsure of any beyond that and haven't asked.

Yes this is a knee jerk reaction by CA, it is Ca after all. That's what we do.

On another note: The more the topic keeps coming up the better. Its all about awareness and I believe its helping to slow the inevitable. I just wish the wake, ski and PWC discussion boards talked more about it.

I have never seen that map before. Kinda cool