What effect could an uncontrolled grass carp population have on the energy pyramids of a lake environment?

Grass carp can grow n early 5 feet long, up to 80 pounds, and capable of eating nearly 150% of it's body weight Grass carp could drain the vegetation in an aquatic environment. This would remove a large portion if not all of the producers from the aquatic environment. Death through starvation would occur all the way up the energy pyramid