Sackets Harbor, NY, Aug 16, 2010 — A thick cake of zebra mussels nearly shut down a water treatment plant in Sackets Harbor last week. The invasive species has been wreaking havoc in Lake Ontario for more than 20 years now. New regulations on the ocean-going freighters that first brought zebra mussels to these shores--and other measures--have led some to believe the invader has been contained. But, as Jonathan Brown reports, officials in Sackets Harbor now fear the species is rebounding.