Nami Resources Company, a Kentucky based Oil and Gas Company have pleaded guilty to charges that infringed both the Clean Water Act and Endangered species Act after it was found that a 2007 fracking waste water spill led to the deaths of several species of fish in the area.
They were fined $50,000 for the incident.
The fracking waste water originated from four of their fracking well sites into the Acorn Fork Creek in south-eastern Kentucky. Soon after, the majority of the fish in the area died, including those that belonged to two endangered species.
Researchers studied water samples and the bodies of the dead fish, and concluded that the fracking spillage had lead to an acidification of the water, and resulted in the fish genocide, with the deceased fish showing signs of gill lessons, liver and spleen damage.
The research into the incident formed the basis of the 2013 peer reviewed study here.