Here, from IPR. An excerpt:
Now there’s a new study that outlines three different options to build physical barriers primarily to block Asian Carp.
Those would be big public works projects with hefty costs of between three and ten billion dollars over the next fifty years.
But the study also shows that preventing even one invasive species from entering the Lakes could save hundreds of millions of dollars a year. That’s what is spent now to treat for sea lamprey or to deal with the effects of zebra and quagga mussels.
If Asian carp get loose in the lakes that could drastically change both sport and commercial fishing. And the lakes would take another economic hit says David Ullrich, director of the Great Lakes and St. Lawrence Cities Initiative, a group of mayors around the lakes. “So the prevention element is critical. And avoiding costs in the future is a great benefit,” Ullrich says.
Turtle Talk 