Read the article. I hadn't heard this, but I've been out of the loop with OSU and ODNR for a few years so my knowledge is not updated.

Article said the bacteria killed "over 90%" of the zebra mussels. That sounds good but maybe not so good. The surviving mussels apparently have an immunity. It is possible all you'd manage to do is kill out the less hardy mussels from the population and that might eventually lead to the same population we have now but more resistant.

It is very hard to predict what an organism will do out in the open environment vs. a laboratory. Quite risky.

Besides, the mussels did not have some of the terrible consequences that were predicted. They have benefited the Lake in some ways, such as increasing the water clarity which has allowed aquatic vegetation to come back in many areas, which increases habitat. I think they are here to stay for the foreseeable future and their population dynamics will vary over time as all species do.