In regard to your story on quagga mussels, I thought to send a picture of zebra mussels I saw in the Colorado River last year. A little different in appearance, but just as harmful.  Strangely enough, I read a few years ago that these mussels, while bad for human endeavours, and most likely harmful to our aquatic environs,  are putting the cleanup of the Great Lakes waters decades ahead of projections, due to their method of filter feeding.  Go figure.

Earlier on ODN

These invasive European mussels could easily be transported here from infested areas in the United States or the Great Lakes region of Canada. They were introduced to North America in the late 1980s.

There are no mandatory check point stations in BC, unlike western US states such as Idaho where you cannot launch a boat unless you have been inspected.  A new campaign launched this summer will educate recreational boaters about the dangers of invasive mussels and what they can do to prevent their spread.

Zebra and Quagga Mussels are thumbnail sized, freshwater mollusks that rapidly colonize hard surfaces and can clog water-intake structures, impact recreation and devastate local fisheries. In the Okanagan-Similkameen, the effects of their invasion would be felt at the commercial activity level, throughout the tourism sector and at the ecological level.