Lionfish are amazing to look at, but they take a serious toll on the marine environment when present in areas where there are no predators to keep them under control. One of the most venomous of all fish species, these deadly beauties can be colorful, with long, separated dorsal spines and vivid stripes. Unfortunately, the lionfish problem is becoming worse in many places, as these fish harm others, leading to imbalance within the ecosystem.
Where Lionfish Come From
In some parts of the world, lionfish are welcome members of reef communities – it’s normally only when they are transplanted to areas where they’re non-native that problems arise. These fish are native to the Pacific Ocean, particularly from Western Australia and Malaysia east toward French Polynesia and the Pitcairn Islands. They are present from northern to southern Japan, and they are also present in southern Korea as well as portions of the southern area of Australia.
Since the 1990s, lionfish have been making their way all the way across oceans, often in ships’ ballast, which transports them across the sea and then spits them out. Invasive lionfish are found all along the east coast of the United States, from Rhode Island to Florida, and they’ve also been documented in Caribbean countries from Turks and Caicos to Cuba and beyond.
There are several different kinds of lionfish. The dwarf species grows to be just about the size of a tennis ball, while larger specimens can grow to be as long as 55 centimeters. In the Caribbean, where they are considered to be an invasive species, conditions are ideal for these fish to grow to even greater sizes, leading to even more problems for local fish. You’ll find these cousins to scorpionfish hiding in caves and caverns, and you’ll also find them in shallow areas along coral reefs.
What Lionfish Eat, and What Eats Lionfish
Lionfish are a lot like their land-based namesakes in that they are voracious eaters, consuming plenty of food and craving more. A single lionfish has the ability to consume 20 small fish within about half an hour, and is able to reduce the overall fish population in a specific area by about 80 percent in just about five weeks. These fish are not picky eaters; in fact, they’ll consume nearly any smaller fish they can fit into their cavernous mouths, catching their victims with their spiny fins and swallowing them whole. Lionfish hunt from late afternoon until early morning, and they’re not afraid to use their spines to protect themselves from predators.
As for which animals eat lionfish, the list is a woefully short one. There are few natural lionfish predators; and these are in short supply in many places, which only makes matters worse. Groupers and a few other fish have been discovered with lionfish remains in their stomachs, and some sharks are able to eat them, too. It is believed that other predators and perhaps even parasites present in the region where they’re natives help to keep populations in check.
There is one other animal which can eat lionfish – look in the mirror and you’ll see him or her! Lionfish are safe to eat, and their white flesh is tender and delicious. Lionfish hunts and cook-offs are becoming more and more popular in parts of the world where these fish are threatening native species, and unlike so many fish which aren’t an ecologically sound choice for catching and consuming, you’re doing the world a favor by preying on lionfish.
Containing the Lionfish Population
In an effort to put a stop to the spread of lionfish, the National Science Foundation has begun conducting extensive research, awarding grants to scientists at Oregon State University, Corvallis, the University of North Carolina, Chapel Hill, and the University of New Hampshire to study the fish and work toward finding a solution to the problems they are causing.
Researchers at Oregon State University are focusing on lionfish predators and diseases, hoping to discover how native pacific populations are kept in check in order to foster a similar solution in areas where the species has become invasive. They have also suggested that marine conservation organizations work to conserve groupers, as these fish will readily prey on lionfish; however, this solution could take time since groupers are overfished and it would take a significant amount of time to bring their numbers back to a healthy level in order to make a dent in the lionfish population.
Researchers note that a publicity campaign with the aim toward increasing human consumption of lionfish is an excellent way to help quell the fish’s growth. REEF has been able to collect information about lionfish, giving fisheries a green light to go after them, and also working with dive operators to help collect lionfish and report lionfish sightings. REEF is also inviting interested divers to join others on organized lionfish study and eradication projects.
Current and Long-Term Effects of Lionfish on the Marine Environment
Lionfish pose both short-term and long-term risks to environments in which they are non-native:
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Ecosystem Unbalance: When lionfish are present, native species can be completely wiped out, causing a complete disaster for the ecosystem, which depends on all its members for healthy balance.
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Damaging Fisheries and Other Related Businesses: Fisheries are important to the world economy, employing millions of people and feeding many who rely on fish as an important protein source. Though fisheries do contribute to problems in many areas, they can be part of a sustainable plan when well-operated. When lionfish prey on the species fisheries target legally, the risk of illegal fishing increases.
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Discouraging Diving and Related Tourism: Lionfish are dangerous, though not deadly; and when they decimate native fish populations, divers look for other sites to explore. This problem affects dive operators, hotels, resorts, restaurants, and all related businesses.
If you decide to help eradicate lionfish, use caution. These fish are not deadly to humans, but their stings are poisonous and painful. If stung, it is likely that you’ll suffer from a serious headache, along with vomiting and breathing difficulties.