(IL) Treehugger An emergency operation to stop invasive Asian carp from reaching the Great Lakes used more than 2,000 gallons of rotenone to poison six miles of a canal near Chicago this week. Tens of thousands of fish were killed.
Just one Asian carp, the target of the poisoning, was found. An estimated 100 tons of dead fish will be taken to a landfill. Studies have shown that Asian carp tend to sink to the bottom when they die.