Colorful underwater world

Autonomous Underwater Robot Hunter Will Take on the Invasive Lionfish

Twenty-five years ago, lionfish started invading coastal waters in the Americas, and the species is now causing damage to the local ecosystems from Venezuela, through the Caribbean, and up the East Coast of the United States. Since most of these fish are genetically similar, the theory goes that a few private fish collectors dumped their fish in the water, and now we have a problem: these fish can lay 30,000 eggs every five days, local prey aren’t scared of them because they still don’t recognize them as predators, and lionfish have no natural predators in these foreign waters.

But humans could become their main predators because these fish are tasty—and they sell for up to $20 a pound at upscale restaurants, when scuba divers can get to them. However, there aren’t enough scuba divers fishing for them, and these fish hideout in spots much deeper than humans can go. Enter stage right: an untethered, autonomous, underwater robot powered by machine learning aims to hunt these fish. Students from Worcester Polytechnic Institute are training the robot to use computer vision to recognize what a lionfish is and then to run it through with a spear.