Quagga/Zebra Mussels

[Actionmat]

I've got loads of these little blighters on my hull. I reached under the boat while in the water and scrubbing the sides and to my horror discovered what appears to be Zebra or Quagga mussels.
I'm dreading checking the props tomorrow. Has anyone else had a problem with these things on the Thames? The only advice I've read on getting rid of them, is to wash and dry the hull after each use. Which is fine for trailered boats but no use to me whatsoever!
I'm overdue an anti foul. Are there any that keep these things at bay?
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[Alpha22]

I found some a few years ago under my boat and in the weed filters. We are on the Gt Ouse in Cambridgeshire.
After slipping, washing down and 2 coats of the usual dirt cheap antifoul from Beaulieu I have not seen any again.

 

[Actionmat]

Thanks. That sounds encouraging:encouragement:

 

[CJL]

If it's a quagga mussel you should report it: http://www.nonnativespecies.org/alerts/index.cfm?id=5