This Underwater Robot Shocks Fish To Death

An ocean research foundation thinks the key to saving ocean life could be electrocuting invasive fish

Photo Illustration: Vocativ
Aug 31, 2016 at 2:13 PM ET

A new non-profit organization that plans to solve environmental threats with robots is developing a machine that electrocutes invasive fish.

Lionfish is a venomous species indigenous to the Indo-Pacific region. Researchers believe the fish started populating the Atlantic — specifically the Gulf of Mexico, Caribbean, and southeastern coast of the United States — sometime in the 1980s, when people began discarding lionfish from their personal aquariums. The fish have very few predators and they’re especially ravenous, overeating so much that they often get liver disease. In their new home, they are decimating reefs and tropical fish populations and the U.S. National Ocean Service believes that the “invasive lionfish populations will continue to grow and cannot be eliminated using conventional methods.”

The Nekton Foundation, a deep-ocean research organization, has teamed up with the non-profit Robots In Service of the Environment (RISE) to develop an unconventional method of culling lionfish — a robot that catches the fish and shocks them to death. Nekton announced the partnership last week, as the England-based foundation made its first visit to the North Atlantic. A Nekton research vessel went to Bermuda, whose government has been trying to control the lionfish population with a task force that encourages spear fishers to hunt the fish. But since these fishers can only target fish in shallow waters, RISE is developing a terminator robot that can kill at greater depths.

So far, RISE has only done shock tests in aquariums and found that saltwater is so conductive that the shock paddles would only harm what is between them. The team tested paddle mechanisms in the Bermudian coasts and found, when operators put clamping paddles around lionfish, the fish rarely flinched — likely because they’re used to nothing coming close to them on account of their poisonous fins. “Lionfish are not naturally afraid of anything so they swam in and around [the robot],” RISE executive director John Rizzi said, in a statement.

Rizzi deemed the first test a success and plans to continue trials over the next nine months, then use the results to develop an underwater vehicle that is operated remotely with the help of a video feed. Eventually, the group wants to make thousands of long-term underwater drones that hunt fish autonomously, which sounds almost as terrifying as invasive species destroying an entire ecosystem.