Neochetina eichhorniae
The mottled water hyacinth weevil , Neochetina eichhorniae , is a beetle that has been introduced as a biological pest control herbivore agent to waterways and lakes in countries worldwide to control the spread of the invasive noxious weed species "Eichhornia crassipes" , the water hyacinth , an aquatic plant native to the Amazon basin . 
<triplet> waterway <subj> lake <obj> location