Category Archives: Invasive Species

The Epic Battle Against Invasive Lionfish

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First reported near Florida in the 1980s, lionfish have since spread throughout southeastern U.S. waters, the Gulf of Mexico, and the Caribbean Sea, taking over coasts from New York to Brazil. These brightly-striped ornamental fish, native to the Indo-Pacific, were believed to have been let loose in U.S. waters by the aquarium trade.The problem: with insatiable appetites (they’ve been found to eat over 70 fish/invertebrate species) these invasive creatures have since wreaked havoc on coral reefs and fisheries, eating both other species’ prey and grazers that clean algae from reefs. Plus, no predators have stepped in to gobble up the strange species, allowing the fish to reproduce relatively unchecked.

Still, scientists and environmentally-minded entrepreneurs alike have been taking action against ballooning lionfish populations, creating and testing everything from underwater robots to fish traps loaded with special recognition software, all designed to drastically lower the lionfish headcount. “It’s the inverse of every fisheries management plan you’ve ever heard of,” says marine biologist Corey Eddy, who focuses on lionfish near Bermuda. “Usually we’re trying to minimize the pressure on fish populations so they can rebound. Now we’re saying, let’s start wiping them out.”

Though strategies like hosting spearfishing tournaments and giving out special lionfish culling permits can help individuals nab hundreds of lionfish in a day, this is nothing compared with the two million eggs a female lionfish could spawn every year. Add that to the fact that they can lurk below 130 feet, too deep for average divers, and scientists have speculated that robots may be better than humans at controlling lionfish populations.

Colin Angle, cofounder of iRobot, had this same thought while diving in Bermuda, only natural since his company has created robots from the Roomba to radioactive nuclear waste cleaners. Inspired by the idea to employ robots in lionsih control, Angle and his wife, biochemist Erika Ebbel, began nonprofit Robots in Service of the Environment (RISE), with the goal of creating an affordable autonomous underwater robot that lethally shocks lionfish by early next year. RISE members feel that lionfish could ultimately become the next popular delicacy, a demand that would vastly help limit lionfish populations. “Ultimately the way this becomes a success is by creating a market and the interest of consumers in eating lionfish,” says John Rizzi, executive director of RISE. “The best way to challenge the sustainability of a species is for humans to eat it. Whether that’s good or bad, in this case that will benefit the environment.”

Similarly, recreational divers Bryan and Anna Clark were inspired to start a nonprofit environmental group called Coast Watch Alliance, which works to simultaneously protect reefs and battle lionfish. Bryan Clark is working on a prototype to suck up the fish with a vacuum-like gulp. He’s also developing a “hunting ROV” (remote-operated vehicle) with a camera to seek out the fish before diving down. He feels that both technology and financial motives will help decimate the lionfish. “Some people are going to harvest lionfish because it’s great for the environment, others will do it because it’s fun to do while they’re diving. But a lot of people are going to do it because they’re going to make some money taking lionfish to the market,” he says.

It just so happens that lionfish have already unwittingly stepped into the spiny lobster fishery commercial market, as 20 percent of lobster traps end up catching lionfish as well. “lf the lionfish are showing up in those traps, uninvited and unintended, then why not get them to show up intentionally?” notes diver Bob Hickerson, who’s putting his contractor skills to good use by designing a better lionfish trap. The “Frapper Trap” (from the French word meaning “to strike down”) will implement a pattern recognition program to seize lionfish, and let other species free. Along with his wife, Maria, his father-in-law, and volunteers from Team Frapper, he hopes to have a trap ready to test in the next six months. “We can’t stand back and watch our reefs being taken over by lionfish,” he says.

Nevertheless, even with such a broad range of arsenals being developed, experts believe that total destruction of lionfish is impossible, though creating a strong commercial market for selling the species to diners could prevent them from devastating entire ecosystems.

“I think commercial incentive will be a big part of the solution, supplemented by spearfishing in shallow water and some of these other things,” says Stephen Gittings, science coordinator at National Oceanic and Atmospheric Administration Office of National Marine Sanctuaries. “Some of these might sound like crazy ideas, but you never know until you try.”

Source: Gaworecki, Mike. “The lionfish invasion: a call to arms?” Mongabay. 14 December 2016.

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