November 10, 2011
“There was a time, not long ago, when environmentalists could arouse fears of invasive Asian carp by highlighting videos of four-foot-long fish leaping out of downstate rivers or the discovery of carp DNA samples a stone’s throw from Lake Michigan.
But a recent event in Chicago suggested that sparking public panic about Asian carp these days requires more pizazz. …
Two Asian carp species, silver and bighead carp, imported from China in the 1970s, escaped from their pens at fish farms in Arkansas and Kentucky. Disrupting ecosystems thanks to their voracious appetite for plankton and algae that other species need to survive, the carp swam up the Mississippi River, crowded the Illinois River and other regional waterways, and zeroed in on Chicago and the Great Lakes.
To combat these and other invasive species, which could threaten the Great Lakes ecosystem and its $7 billion fishing industries, the resources defense council has proposed physical barriers to separate Chicago waterways and Lake Michigan from the Mississippi. Ms. Gang’s book, Reverse Effect: Renewing Chicago’s Waterways, sees the barriers as an opportunity to remake the city’s riverfront.
The barrier proposal, Mr. Henderson said, ‘is just a step toward advancing the broader discourse.’”