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An underwater view of the Morrison Springs state park floating dock with a large school of Blugill and Sunfish swimming under cover of the dock and within the overtaking field of Hydrilla plants. Hydrilla is naturalised and invasive in the United States following release in the 1960s from aquariums into waterways in Florida.Hydrilla (Esthwaite Waterweed or Hydrilla) is a genus of aquatic plant