Technology Helps Control Invasive Lionfish Population

As invasive lionfish reach uncontrollable depths in the Atlantic, conservationists turn towards technology to control the population.

The problem began in 1992 when Hurricane Andrew washed an aquarium tank out to sea, releasing six lionfish into Biscayne Bay. Since then, the invasive Atlantic population has grown exponentially, threatening the native marine ecosystem.

Lionfish lay on average 2 million eggs per year, which contain a repellent that wards off predators from the eggs. They also lack predators in non-native habitats and have voracious appetites, feeding on more than 50 native species of fish. Since their introduction to the Atlantic and Caribbean, they have decimated native fish populations and affected the ecosystems those species help to keep in balance.

A Lionfish calmly floating. Credit: Dave Scriven

Once lionfish are established in an area it is very difficult to get rid of them and they can quickly destroy much of a reef’s biodiversity. [They] can strip a reef of 90% of its juvenile fish species in as little as five weeks.”

Ocean Support Foundation

Researchers initially hoped that larger pelagic predators would control the population, but have since determined that to solve this dilemma, only one species can match their appetite—humans.

Once their 18 venomous spines are removed, cooked lionfish becomes a popular delicacy. Now that coastal restaurants and markets have placed it on their menu, the market for lionfish is seemingly endless, but they can’t be caught on lines so must be either spearfished or caught in nets. This has proven successful in shallower waters, but lionfish have been observed to reach depths past 1000 meters, plunging deeper than humans can reach.

The present solution, being developed independently by roboticists, is a remotely operated, underwater vehicle. Created by RSE, the founders of the Roomba robot vacuum, their latest prototype has been deemed the “Guardian LF1.”

 The Guardian LF1, a prototype robot that stuns and collects invasive lionfish. Credit: Robots in Service of the Environment (RSE)

The Guardian is a 20-pound submersible remotely operated vehicle equipped with cameras and lights – and two paddles that can deliver a 20-volt shock to a lionfish.”

Chris Lovenko, The Christian Science Monitor

Once stunned, the fish are sucked into a water-filled storage chamber that holds up to 20 fish. When the chamber is filled, the Guardian returns to the surface with its catch.

The Guardian is currently priced at $1000 which, considering their meat is sold for $5 per pound and a single machine can catch 20 per dive, professional divers and lionfish hunters would benefit greatly from this investment.

As our world faces the sixth mass extinction, investment in innovative tools is becoming a vital approach to conservation. While the “Lionfish Roomba” will not eliminate the threat to native fish, it will curb the population while scientists continue to study and develop additional tools and approaches.

Source: Christian Science Monitor
Featured photo: Invasive lionfish threaten marine biodiversity in the Atlantic. Credit: Robert Couse-Baker

About Nicholas Scott

Nick is an undergraduate Marine Biology student at the University of California, Santa Cruz. Having spent his life exploring the ocean on California’s coast, he developed a passion and respect for it, that demanded him to pursue his interest in conservation. Volunteering for the communications team allows him to further his interests and gain more insight as to how to resolve the state of the world around us. In his spare time, Nick enjoys surfing, swimming, and spending time with friends.

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