Lionfish in the Atlantic and Caribbean

By the MASNA Board and Volunteers. Published January 29, 2016, Updated October 2019.

2016 PDF Available Here


An adult lionfish (Pterois volitans). Public Domain, WikiMedia []

An adult lionfish (Pterois volitans). Public Domain, WikiMedia []

Two species of lionfish, Pterois volitans and Pterois miles, are invasive fishes in the Western Atlantic Ocean, specifically the east coast of North America, The Gulf of Mexico, the Bahamas, and the Caribbean (Schofield 2010; Guzman-Mendez et al., 2017). Both the populations and range of these fishes have expanded rapidly since they were first documented in coastal waters off of south Florida in 1985, and have since spread as far south as Brazil (Ferreira et al., 2015). It is most likely that the introduction of these fishes was made either accidentally or intentionally by individual(s) involved with the aquarium trade (Kimball et al., 2004).

The lionfish’s highly successful invasion of the Atlantic and Caribbean ecosystems, along with a lack of natural predators, makes it extremely unlikely that the populations will be eradicated. This article examines issues related to lionfish and other invasive aquatic species that have been introduced into waters around North America. It is important that marine aquarium hobbyists be aware of the potential consequences of releasing livestock into the wild.

What Are Lionfish?


Order:             Scorpaeniformes
Suborder:       Scorpaenoidei
Family:            Scorpaenidae, the scorpionfishes and the rockfishes.
Subfamily:      Pteroinae, the lionfishes.
Genera:          Brachypterois

Lionfishes are easily recognizable by their bars (vertical lines), tall dorsal fin spines, and enormous pectoral fins. Lionfishes belong to the family (biological classification) Scorpaenidae, a well-known family consisting of the scorpionfishes and the rockfishes. Collectively, the lionfishes (or firefishes) consist of five genera (singular: genus) and are all allocated to the subfamily Pteroinae (one of ten subfamilies in Scorpaenidae).

A Lionfish (Pterois volitans). Public Domain, WikiMedia []

A juvenile lionfish (Pterois volitans). Public Domain, WikiMedia []

The most well-known genera in the marine aquarium hobby are Pterois and Dendrochirus, although Parapterois does enter the hobby on occasion (Rhyne et al., 2015; Lyons et al. 2019). The bulk of the trade consists of two species: the red lionfish (Pterois volitans) and Devil firefish (Pterois miles). These two species are also the two species that are now invasive in the Atlantic and Caribbean.

There are 12 known species in the genus Pterois and eight in the genus Dendrochirus. Studies using DNA have shown that the genera Pterois and Dendrochirus are very closely related (Kochzius et al., 2003), and that some taxonomic corrections are necessary (the authors of the paper suggest that moving species of Dendrochirus to Pterois may be warranted).

In addition to their striking coloration and behaviors using their pectoral fins, lionfishes are revered for their venomous spines. Lionfishes come in a range of sizes, from the small (~4 inch) twospot turkeyfish (fu man chu, Dendrochirus biocellatus) to the larger red lionfish at about 1 foot. The record red lionfish (Pterois volitans) caught measured 18.5 inches total length. In addition to their value for the ornamental hobby, lionfishes are popular as food in some parts of the world. Their popularity as a food item in the Americas is increasing rapidly. Lionfish can now be found served from small beachside shacks to high-end, luxurious restaurants.

Origin of the Problem

Lionfish collected by Florida Fish and Wildlife. Photo credit to Florida Fish and Wildlife (

Lionfish collected by Florida Fish and Wildlife. Photo credit to Florida Fish and Wildlife (

Lionfish populations were first reported off the coast of Florida near Dania Beach in 1985 (FFWCC, 2015). It is not clear whether the introduction was accidental or intentional, but nevertheless the first breeding specimens most likely came from the aquarium trade. It is highly probable that hobbyists released aquarium lionfish into the ocean because they were shutting down tanks, the lionfish became too large for the aquarium, the lionfish were eating other tank inhabitants, or the owner simply lost interest in keeping the fish.

A commonly cited source of the introduction is from a tank on a seawall in Biscayne Bay, FL, that was smashed by Hurricane Andrew in 1992 (Courtenay, 1995). However, this information came “second hand” to the author, where informants thought that “six to eight” lionfish specimens observed in the bay in 1992 came from that tank (Morell, 2010). Dr. Courtenay maintains that if in 1992 lionfish did escape from that tank [which he doubts], then they are not the source of the current invasion, as other sightings have been reported prior to this event. Although, if lionfish did escape in 1992, they may have contributed to the already present small population.

Two filleted lionfishes showing very large ovaries. Image © Byron G. Boekhoudt, M.Sc., Officer in charge of Fisheries at the Department of Agriculture, Husbandry and Fisheries, Aruba. Image modified with permission.

Two filleted lionfishes showing very large ovaries. Image © Byron G. Boekhoudt, M.Sc., Officer in charge of Fisheries at the Department of Agriculture, Husbandry and Fisheries, Aruba. Image modified with permission.

Finally, invasive species have been transported great distances in freighter ballast tanks (Briski et al., 2012). Although it is highly improbable, it is possible that lionfish eggs or larvae could have been taken in with ballast water, survived a lengthy transoceanic voyage, and released in Atlantic waters only to grow into adult fish capable of reproducing (Semmens et al., 2004).

Most genetic studies have revealed very low genetic diversity of lionfish in the Western Atlantic, compared to their native range (Betancur-R et al., 2011; Butterfield et al., 2015, Freshwater et al., 2009). The low genetic diversity supports that only a few individuals founded the Western Atlantic populations of lionfish, and supports the hypothesis that the lionfish originated from the aquarium trade.

Dispersal and Current Range

The natural range of the Mile’s firefish (in blue) and red lionfish (in green) are the Indian and Pacific Oceans, respectively. The non-native range of these species include the Americas and the Mediterranean (in red). The American invasion started in Southern Florida and the red lionfish (P. volitans) is well established across the entire caribbean and western mid-Atlantic. Mile’s firefish, on the other hand, did not spread as quickly as the red lionfish, and is mostly restricted to the Bahamas and eastern coast of the United States. Recently, a single specimen of P. volitans genetically linked to the Caribbean invaders was caught in Rio de Janeiro, Brazil (Ferreira et al. 2015), however there is no established population south of Venezuela.

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Graphs and Link provided in the “Dispersal and Current Range” sections are credited to: the U.S. Geological Survey, Department of the Interior/USGS

From 1985 to 1999 sightings were restricted to Southern Florida. By 1999, the Florida population had grown large enough to reproduce substantially, resulting in their larvae being carried north with the Gulf Stream. The following year, in 2000, the first sightings outside of Florida were reported in South Carolina, North Carolina, and Bermuda. Between 2000 and 2004, populations established themselves along the east coast of the U.S., and the first sighting in the Bahamas occurred in 2004. Between 2004 and 2006, the lionfish spread southward in the Bahamas and in 2006 the first sighting in the Gulf of Mexico was reported in Florida (in Tampa).

In 2007, the invasion reached the Caribbean. Lionfish likely invaded the Caribbean through the Windward Passage, the waterway between the islands Cuba and Hispaniola. From that point on, lionfish spread both westward towards Central America and eastward towards the Lesser Antilles. Having reached Central America in 2008, larvae now likely rode the Gulfstream and colonized the Florida Keys, and became more prominent in the Gulf of Mexico. By 2012, the lionfish were well established across the Eastern Seaboard, the Bahamas, the Gulf of Mexico, and the entirety of the Caribbean. Lastly in 2014, a single specimen was caught in Rio de Janeiro, Brazil, suggesting that the Amazon River, which forms a freshwater barrier for many marine species, may not impede the southerly expansion of the lionfish.

Follow this link for an interactive map of the lionfish invasion.
Credit: U.S. Geological Survey
Department of the Interior/USGS

Lionfish Behavior

A trio Miles firefish (P. miles) hunting at night in Red Sea, Egypt. Notice how the pectoral fins are spread to corral the prey, and the inclined position of the (upper left) individual ready to strike. The small prey fish can be seen right under the shadow of the upper left lionfish. Image © Derek Keats.

A trio of Miles firefish (P. miles) hunting at night in Red Sea, Egypt. Notice how the pectoral fins are spread to corral the prey, and the inclined position of the (upper left) individual ready to strike. The small prey fish can be seen right under the shadow of the upper left lionfish. Image © Derek Keats.

Lionfish are slow moving fish that rely on stalking prey, usually at night. However, Atlantic lionfish that have been caught late in the daytime have often been found with freshly eaten fish in their stomachs, indicating they are successful daytime hunters (Cure et al., 2012). Their bright coloring and venomous spines warn would-be predators, while their large pectoral fins are used to corral prey.

They find their home in mangroves, on reefs, on hard bottoms, and around manmade features, such as, piers and shipwrecks (Cure et al., 2014). As long as an appropriate food supply is present, they are able to make a living in just about any warm water marine environment.

One report indicates that lionfish adapt their behavior to avoid being caught in areas where they are culled in an effort to reduce their population (Côté, 2014). It seems that they hide deeper in the reef, and are more likely to avoid divers in areas where lionfish are removed. This phenomenon makes eradication even more challenging.

Adaptation to Living in the Atlantic

The waters of the Caribbean Sea, Gulf of Mexico, and Atlantic Coast of the southern U.S. offer water conditions similar to the native range of these fish (Dabruzzi et al., 2017; Lyons et al., 2017). The north–flowing Gulf Stream delivers warm water to mid-Atlantic and New England coasts, allowing lionfish to exist as far north as Narragansett Bay in Rhode Island during the warmer months (Kimball et al., 2004). Although they commonly inhabit reefs and shallow areas, lionfish have been sighted at depths up to 1,000 feet. With an abundant food supply, oceanographic features similar to their natural range and few predators, lionfish have established themselves as permanent inhabitants of the Western Atlantic.

Effect on Native Species

Researchers are working to understand the long-term effect lionfish will have on native fish and invertebrate populations in the Atlantic. Invasive animals always change ecosystems, sometimes causing massive changes in both native and other invasive species populations. Comparisons between the Bahamas (mostly P. volitans) and reefs in Kenya (P. miles) have shown that in the Bahamas, the lionfish occur both in greater densities and also grow larger (Darling et al., 2011). However, when they accounted for four other species of lionfish in Kenya, the densities between the Bahamas and Kenya were similar (Darling et al., 2011), suggesting that competition between different lionfish species may be a factor in controlling the densities of any given lionfish species.

Various images of the gut contents of lionfish. The prey items are often too digested for positive identification. But in these images we can see a freshly eaten bicolor damselfish (upper left), a newly recruited yellowhead jawfish (upper right), silversides (bottom left), and a squirrelfish (bottom right). Images © Byron G. Boekhoudt, M.Sc., Officer in charge of Fisheries at the Department of Agriculture, Husbandry and Fisheries, Aruba. Image modified with permission.

Various images of the gut contents of lionfish. The prey items are often too digested for positive identification. But in these images we can see a freshly eaten bicolor damselfish (upper left), a newly recruited yellowhead jawfish (upper right), silversides (bottom left), and a squirrelfish (bottom right). Images © Byron G. Boekhoudt, M.Sc., Officer in charge of Fisheries at the Department of Agriculture, Husbandry and Fisheries, Aruba. Image modified with permission.

It has been suggested that groupers may act as a biological control for lionfish, and eye-witness accounts have indeed documented isolated instances of native predators consuming lionfishes in their invaded range (Maljković et al., 2008). Researchers have found some evidence supporting this. In well protected marine reserves, with high densities of groupers, lionfish numbers tend to be lower (Mumby et al., 2011). However, grouper populations have been severely reduced as a result of overexploitation by humans. The numbers of grouper are so low that they will not effectively function as biological controls at their current densities (Mumby et al., 2011), and large scale studies across the Western Atlantic have found no evidence of native predators having any influence on lionfish densities (Hackerott et al., 2013; Bejarano et al., 2014).

2016 Winter Lionfish Derby, March 12, Islamorada, FL.

2016 Winter Lionfish Derby, March 12, Islamorada, FL.

In the Bahamas researchers determined that lionfish tend to favor crustaceans when they are smaller, and switch almost exclusively to fish prey as adults. On average, as adults, their prey consisted of mainly fishes (78%) and crustaceans (14%). The top family of native fishes that they preyed upon were gobies, wrasses, grammas, cardinalfishes, angelfishes, basses, blennies, silversides, mullets, and filefishes (Morris and Akins, 2009). In another study (Green et al. 2012) in the Bahamas, researchers found that between 2004 and 2010, the lionfish densities increased to a point where lionfish constituted almost 40% of the predators on a reef in terms of mass (weight).

Considering that most reef predators in the Caribbean are large (groupers, sharks, etc), for lionfish to makeup 40%, indicates how many of them are actually present. Furthermore, over the same period, a 65% decline in biomass (weight of fish present) was observed for the prey species of lionfish (Green et al. 2012). Lionfish also target new recruits to reefs (fishes just settling from the plankton, and starting to live on the reef). In controlled studies on a reef, it was shown that reefs that had lionfish present had reductions, on average, of ~80% in new recruits (Albins and Hixon, 2008). With their abundance and with 4 out of 5 settling fish being eaten, it is not hard to imagine the great effects that lionfish are having in the Western Atlantic.

Lionfish Removal and Awareness Day Festival, May 2016, Pensacola Florida

Lionfish Removal and Awareness Day Festival, May 2016, Pensacola, Florida

Lionfish derbies and culling by people have been shown to be effective means of controlling lionfish populations, and their undesired negative effects. In the Cayman Islands, it was shown that regular culling reduced not only the overall abundance, but also the mean size of lionfish (Frazier et al., 2012). Furthermore, it has been shown that culling can halt reductions in native prey declines, and even reverse some of the declines (Green et al. 2014).

What You Can Do to Help

Speared Lionfish. Credit to CameliaTWU (

Speared Lionfish. Credit to CameliaTWU (

As a marine aquarium hobbyist it’s critical that you never release any livestock into the ocean. Lionfish are not the first (and likely won’t be the last) kind of fish that aquarium hobbyists have introduced to non-native waters. Luckily, many of them did not get established, or become invasive. Nevertheless, the first line of defense is to never create the potential for problems by releasing non-native fishes. Only a well-equipped and experienced diver should attempt to capture a lionfish due to the hazard of being impaled by their sharp, venomous spines. However, if you are fishing in an area where lionfish are present and you catch one, there are three steps you can take to help the situation.

  1. Report the presence of the fish to the United States Geological Survey by visiting the Non-indigenous Aquatic Species web page at Data collected by the USGS is used to help determine the range and population of invasive lionfish. It’s a good idea to visit the site in advance of a possible fishing trip so you know what sort of information the USGS would like to collect about each fish.
  2. Do not release the fish back into the ocean. Every reproductive female that’s removed from the ocean reduces the number of potential future fish. Every lionfish of either sex reduces predation pressures on native species.
  3. Eat it. Lionfish are reported to be delicious and a number of cookbooks exist to help you clean and prepare it (Thornburgh, 2011). Due to zoonotic and other concerns, only eat wild collected Lionfish.

Effect on Aquarium Trade

On August 1st, 2014 the Florida Fish and Wildlife Conservation Commission approved new rules that forbid the import of lionfish (any species of the genus Pterois) into the state of Florida, Florida Rule Nr 68B-5.006 Lionfish. Accordingly, 10 of the 12 species of Pterois that are traded (Rhyne et al., 2015), are unavailable to the hobbyists in Florida. Furthermore, revisions that went into effect December 1st, 2014 also forbid the breeding of lionfish in Florida, and the possession of eggs or larvae in captivity for any purpose other than destruction. However, one can apply for a “Conditional/Prohibited/Nonnative species permit” to possess eggs and larvae. Lionfish caught in Florida can still be legally traded within the state, and also exported to other states. Lastly, if scientists decide that the genus Dendrochirus is indeed invalid, and all species of Dendrochirus get moved into the genus Pterois, all those species will also become illegal for import into Florida.

Other Invasive Species

The aquarium trade is responsible for approximately one third of all aquatic invasive species in fresh and marine environments (Oskin, 2013). Hobbyists have released a wide variety of plants, fish and invertebrates into coastal waters causing ecosystem damage. As another notable example of the powerful effect of an invasive species, the release of the macroalgae Caulerpa taxifolia has had a profound impacts in areas of coastal California and in the Mediterranean Sea, overtaking native seagrass and kelp beds by crowding out these important native plants (Meinesz et al., 2001; Woodfield, 2008). The release of Caulerpa was most certainly related to the aquarium trade.

Update on the Lionfish Invasion (October 2019)

The lionfish invasion continues to affect native fauna throughout the southwestern Atlantic Ocean, the Gulf of Mexico, and the Greater Caribbean Sea. One modelling study predicts the continued impacts of lionfish on important commercial fisheries throughout its invaded range (Johnston et al., 2017). New research has identified some potential pitfalls of human control efforts which primarily use spearfishing as a means of manual removal.

Graphical representation of ontogenetic shift in habitat use exhibited by lionfish in the Caribbean. Figure from Andradi-Brown et al. 2017.

Some evidence suggests that while manual removals of lionfish by spearfishing may temporarily reduce population density, they are ineffective at preventing rapid re-colonization (Dahl et al., 2017). Additionally, scientists have discovered that as lionfish age, larger individuals move onto deeper mesophotic reefs that are out of the reach of recreational diving limits, further reducing fishing pressure on the oldest individuals (Lesser and Slattery, 2011; Andradi-Brown et al., 2017). In Bermuda, large individuals have been reported from over 300 meters in depth (Gress et al., 2017). The reproductive output of female lionfish increases as they grow in size, and these large individuals contribute the greatest number of offspring to population growth. However, the National Oceanographic and Atmospheric Administration (NOAA) has recently developed deployable traps that attract lionfish with artificial structure. By further refining their design and effectiveness, NOAA hopes to provide recreational and commercial fishermen to target lionfish populations that are currently out of the reach of spearfishing. For more information on these developments, see HERE.

Mediterranean invasion of Pterois miles from 1991 (introduction) to 2016. Figure from Azzurro et al. 2011.

Recently, a second population of P. miles has migrated through the Suez Canal and has established in the Mediterranean Sea (Bariche et al., 2013; Kletou et al., 2016). This invasive population is spreading rapidly throughout the coastal waters of Italy, Greece, and Turkey, and has the potential to negatively affect commercial fisheries throughout the region (Azzurro et al., 2017; Özbek et al., 2017). A locally focused research project in Cypress has made some progress in tracking and attempting to mitigate this invasion (Kleitou, 2019). However, the European Union has provided limited support in developing a multi-country management plan. Considering the ecological damages of lionfish in the Caribbean as an indicator for potential impacts in the Mediterranean, early action from a broad range of stakeholder groups will be necessary to curb damages.

Our understanding of lionfish diversity is becoming clear as researchers continue to draw lines between where one species ends and another begins. Recent taxonomic revisions have resulted in the identification of several new species of both Pterois and Dendrochirus (Matsunuma and Motomura 2013, 2015, 2016; Matsunuma et al., 2017). These species distinctions may have important implications for the potential risks associated with future introductions, and may impact the way lionfish trade is managed in the United States.


Florida Fish and Wildlife Conservation Commission: Resource for fishing, cleaning and cooking lionfish Lionfish Research Program:

USGS Non-indigenous Aquatic Species page:


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