| Lionfish | |
|---|---|
 | |
| Pterois volitans | |
Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Perciformes |
| Family: | Scorpaenidae |
| Tribe: | Pteroini |
| Genus: | Pterois Oken, 1817[1] |
| Type species | |
| Scorpaena volitans | |
| Synonyms[1] | |
Pterois is agenus ofvenomous marine fish, commonly known as thelionfish, native to theIndo-Pacific. It is characterized by conspicuouswarning coloration with red or black bands and ostentatious dorsal fins tipped with venomousspines.[3][4]Pterois radiata,Pterois volitans, andPterois miles are the most commonly studied species in the genus.Pterois species are popular aquarium fish.[3]P. volitans andP. miles are recent and significantinvasive species in the west Atlantic,Caribbean Sea, andMediterranean Sea.[5][6][7]
Pterois was described as a genus in 1817 by Germannaturalist,botanist,biologist, andornithologistLorenz Oken. In 1856, French naturalistEugène Anselme Sébastien Léon Desmarest designatedScorpaena volitans, which had been named byBloch in 1787 and which was the same as Linnaeus's 1758Gasterosteus volitans, as thetype species of the genus.[1][8][2] This genus is classified within thetribePteroini of thesubfamilyScorpaeninae within the family Scorpaenidae.[9] The genus namePterois is based onGeorges Cuvier's 1816French name, "Les Pterois", meaning "fins", which is an allusion to the high dorsal and long pectoral fins.[10]
Currently, 12 recognized species are in this genus:
| Image | Scientific name | Common name | Distribution |
|---|---|---|---|
 | Pterois andover(G. R. Allen &Erdmann, 2008) | Andover lionfish | Indonesia and Papua New Guinea and ranges as far as Sabah, Malaysia, and the Philippines |
 | Pterois antennata(Bloch, 1787) | Spot-fin lionfish | Tropical Indian and Western Pacific Oceans |
 | Pterois brevipectoralis(Mandritsa, 2002) | Western Indian Ocean | |
 | Pterois cincta(Rüppell, 1838) | Red Sea lionfish[11] | Jeddah, Saudi Arabia, Red Sea |
 | Pterois lunulata(Temminck &Schlegel, 1843) | Luna lionfish | Western Pacific Ocean |
.JPG) | Pterois miles(J. W. Bennett, 1828) | Devil firefish | Indian Ocean, from the Red Sea, to South Africa, and to Indonesia |
%2c_islas_Ad_Dimaniyat%2c_Om%25C3%25A1n%2c_2024-08-13%2c_DD_40.jpg) | Pterois mombasae(J. L. B. Smith, 1957) | African lionfish, frill-fin turkeyfish | tropical Indian Ocean and the Western Pacific |
 | Pterois paucispinula(Matsunuma &Motomura, 2014)[12] | India to northern Australia (Timor Sea); north to southern Japan; eastward to Wallis and Futuna Islands | |
.JPG) | Pterois radiata(G. Cuvier, 1829) | Clear-fin lionfish[11] | Red Sea to Sodwana Bay, South Africa and to the Society Islands, north to the Ryukyu Islands, south to New Caledonia |
 | Pterois russelii(E. T. Bennett, 1831) | Plaintail turkeyfish, soldier lionfish, or Russell's lionfish | Persian Gulf and East Africa to New Guinea, south to Western Australia |
 | Pterois sphex(D. S. Jordan &Evermann, 1903) | Hawaiian turkeyfish | Hawaii |
 | Pterois volitans(Linnaeus,1758) | Red lionfish | Indo-Pacific region, Western Atlantic Ocean, Caribbean Sea |
Molecular studies and morphological data have indicated thatP. lunulata is ajunior synonym ofP. russelii, and thatP. volitans may be ahybrid betweenP. miles andP. russeliisensu lato.[13]
According to the National Oceanic and Atmospheric Administration, "lionfish have distinctive brown or maroon, and white stripes or bands covering the head and body. They have fleshy tentacles above their eyes and below the mouth; fan-like pectoral fins; long, separated dorsal spines; 13 dorsal spines; 10–11 dorsal soft rays; three anal spines; and six or seven anal soft rays. An adult lionfish can grow as large as 18 inches."[14]
Juvenile lionfish have a uniquetentacle located above their eye sockets that varies inphenotype between species.[15] The evolution of this tentacle is suggested to serve to continually attract new prey; studies also suggest it plays a role insexual selection.[15]
Pterois species can live from 5 to 15 years and have complex courtship and mating behaviors.[16] Females frequently release two mucus-filled egg clusters, which can contain as many as 15,000 eggs. In total, they can lay up about 2 million eggs per year.[14][17]
All species areaposematic; they have conspicuous coloration with boldly contrasting stripes and wide fans of projecting spines, advertising their ability to defend themselves.[18]
Pterois prey mostly on small fish, invertebrates, and mollusks, with up to six different species of prey found in the gastrointestinal tracts of some specimens. Lionfish feed most actively in the morning.[19] Lionfish are skilled hunters, using specializedswim bladder muscles to provide precise control of their location in the water column, allowing them to alter their center of gravity the better to attack prey.[19] They blow jets of water while approaching prey, which serves to confuse them[20] and alter the orientation of the prey so that the smaller fish is facing the lionfish. This results in a higher degree of predatory efficiency as head-first capture is easier for the lionfish.[21] The lionfish then spreads its largepectoral fins and swallows its prey in a single motion.[16]
Moray eels,[22][23]bluespotted cornetfish,barracuda and largegroupers[24] have been observed preying on lionfish.[25][26][27][28] Sharks are also believed to be capable of preying on lionfish with no ill effects from their spines.[28][29]
Park officials of theRoatan Marine Park in Honduras have attempted to train sharks to feed on lionfish to control the invasive populations in the Caribbean.[30] TheBobbit worm, an ambush predator, has been filmed preying upon lionfish in Indonesia.[31] Predators of larvae and juvenile lionfish remain unknown, but may prove to be the primary limiting factor of lionfish populations in their native range.[23] InTexas andFlorida where lionfish are regarded as aninvasive species,scuba divers andbreath-hold divers are encouraged to capture lionfish for sport and food.[28][32]
Parasites of lionfish have rarely been observed, and are assumed to be infrequent. They includeisopods andleeches.[33]
Lionfish are known for theirvenomous fin rays, which makes them hazardous to other marine animals, as well as humans.[4]Pterois venom produced negativeinotropic andchronotropic effects when tested in both frog and clam hearts[34] and has a depressive effect on rabbit blood pressure.[35] These results are thought to be due tonitric oxide release.[36] In humans,Pterois venom can cause systemic effects such as pain, nausea, vomiting, fever, headache, numbness, paresthesia, diarrhea, sweating, temporary paralysis of the limbs, respiratory insufficiency, heart failure, convulsions, and can be fatal. Fatalities are more common in very young children, the elderly, or those who are allergic to the venom. The venom is rarely fatal to healthy adults, but some species have enough venom to produce extreme discomfort for a period of several days. Moreover,Pterois venom poses a danger to allergic victims as they may experienceanaphylaxis, a serious and often life-threatening condition that requires immediate emergency medical treatment. Severe allergic reactions toPterois venom include chest pain, severe breathing difficulties, a drop in blood pressure, swelling of the tongue, sweating, or slurred speech. Such reactions can be fatal if not treated.
Lionfishare edible if prepared correctly.[32][37][38]
The lionfish is native to the Indian Ocean and Western Pacific Ocean. They can be found around the seaward edge of shallow coral reefs, lagoons, rocky substrates, and on mesophotic reefs, and can live in areas of varying salinity, temperature, and depth.[39] They are also frequently found in turbid inshore areas and harbors,[40] and have a generally hostile attitude and are territorial toward otherreef fish.[41] They are commonly found from shallow waters down to past 100 m (330 ft) depth,[42] and have in several locations been recorded to 300 m depth.[43] Many universities in the Indo-Pacific have documented reports ofPterois aggression toward divers and researchers.[41]P. volitans andP. miles are native to subtropical and tropical regions from southernJapan and southernKorea to the east coast ofAustralia,Indonesia,Micronesia,French Polynesia, and the South Pacific Ocean.[40]P. miles is also found in the Indian Ocean, fromSumatra toSri Lanka and theRed Sea.[44]
Two of the 12 species ofPterois, the red lionfish (P. volitans) and the common lionfish (P. miles), have established themselves as significantinvasive species off the East Coast of the United States and in theCaribbean. About 93% of the invasive population in the Western Atlantic isP. volitans.[45]
The red lionfish is found off the East Coast and Gulf Coast of the United States and in the Caribbean Sea, and was likely first introduced off the Florida coast by the early to mid-1980s.[46] This introduction may have occurred in 1992 whenHurricane Andrew destroyed an aquarium in southern Florida, releasing six lionfish intoBiscayne Bay.[47] A lionfish was discovered off the coast ofDania Beach, south Florida, as early as 1985, before Hurricane Andrew.[19][48][49] The lionfish resemble those of the Philippines, implicating the aquarium trade,[50] suggesting individuals may have been purposely discarded by dissatisfied aquarium enthusiasts.[50] This is in part because lionfish require an experienced aquarist, but are often sold to novices who find their care too difficult. In 2001, theNational Oceanic and Atmospheric Administration (NOAA) documented several sightings of lionfish off the coast of Florida, Georgia, South Carolina, North Carolina,Bermuda, and Delaware. In August 2014, when theGulf Stream was discharging into the mouth of theDelaware Bay, two lionfish were caught by a surf fisherman off the ocean side shore ofCape Henlopen State Park: a red lionfish that weighed 1 pound4+1⁄2 ounces (580 g) and a common lionfish that weighed 1 pound 2 ounces (510 g). Three days later, a 1-pound-3-ounce (540 g) red lionfish was caught off the shore ofBroadkill Beach which is in the Delaware Bay approximately 15 miles (24 km) north of Cape Henlopen State Park. Lionfish were first detected in theBahamas in 2004.[51] In June 2013 lionfish were discovered as far east asBarbados,[52] and as far south as theLos Roques Archipelago and manyVenezuelan continental beaches.[53] Lionfish were first sighted in Brazilian waters in late 2014.[54]Genetic testing on a single captured individual revealed that it was related to the populations found in the Caribbean, suggesting larval dispersal rather than an intentional release.[citation needed]
Adult lionfish specimens are now found along the United States East Coast fromCape Hatteras, North Carolina, to Florida, and along the Gulf Coast to Texas.[55] They are also found off Bermuda, the Bahamas, and throughout the Caribbean, including theTurks and Caicos,Haiti,Cuba,the Dominican Republic, theCayman Islands,Aruba,Curacao,Trinidad and Tobago,Bonaire,Puerto Rico,St. Croix,Belize,Honduras,Colombia andMexico.[4] Population densities continue to increase in the invaded areas, resulting in a population boom of up to 700% in some areas between 2004 and 2008.[4][56]
Pterois species are known for devouring many other aquarium fishes,[50] unusual in that they are among the few fish species to successfully establish populations in open marine systems.[57]
Pelagic larval dispersion is assumed to occur throughoceanic currents, including theGulf Stream and theCaribbean Current.Ballast water can also contribute to the dispersal.[4]
Extreme temperatures present geographical constraints in the distribution of aquatic species,[58] indicating temperature tolerance plays a role in the lionfish's survival, reproduction, and range of distribution.[51] The abrupt differences in water temperatures north and south of Cape Hatteras directly correlate with the abundance and distribution ofPterois.[58]Pterois expanded along thesoutheastern coast of the United States and occupied thermal-appropriate zones within 10 years,[58] and the shoreward expansion of this thermally appropriate habitat is expected in coming decades as winter water temperatures warm in response to anthropogenic climate change.[59] Although the timeline of observations points to the east coast of Florida as the initial source of the western Atlantic invasion, the relationship of the United States East Coast and Bahamian lionfish invasion is uncertain.[60] Lionfish can tolerate a minimum salinity of 5 ppt (0.5%) and even withstand pulses of fresh water, which means they can also be found in estuaries of freshwater rivers.[61]
The lionfish invasion is considered to be one of the most serious recent threats to Caribbean and Florida coral reef ecosystems. To help address the pervasive problem, in 2015, the NOAA partnered with the Gulf and Caribbean Fisheries Institute to set up a lionfish portal to provide scientifically accurate information on the invasion and its impacts.[62] The lionfish web portal[63] is aimed at all those involved and affected, including coastal managers, educators, and the public, and the portal was designed as a source of training videos, fact sheets, examples of management plans, and guidelines for monitoring. The web portal draws on the expertise of NOAA's own scientists, as well as that of other scientists and policy makers from academia or NGOs, and managers.[citation needed]
Lionfish have also established themselves in parts of theMediterranean - with records down to 110 m depth.[42] Lionfish have been found inMaltese waters[64][42] and waters of other Mediterranean countries, as well as Croatia.[65] Warming sea temperatures may be allowing lionfish to further expand their range in the Mediterranean.[66][67]
Lionfish have successfully pioneered the coastal waters of the Atlantic in less than a decade, and pose a major threat to reef ecological systems in these areas. A study comparing their abundance from Florida to North Carolina with several species of groupers found they were second only to the nativescamp grouper and equally abundant to thegraysby,gag, androck hind.[4] This could be due to a surplus of resource availability resulting from theoverfishing of lionfish predators like grouper.[68] Although the lionfish has not expanded to a population size currently causing major ecological problems, their invasion in the United States coastal waters could lead to serious problems in the future. One likely ecological impact caused byPterois could be their impact on prey population numbers by directly affectingfood web relationships. This could ultimately lead to reef deterioration and could negatively influence Atlantictrophic cascade.[16] Lionfish have already been shown to overpopulate reef areas and display aggressive tendencies, forcing native species to move to waters where conditions might be less than favorable.[4]
Lionfish could be reducing Atlantic reef diversity by up to 80%.[41] In July 2011, lionfish were reported for the first time in theFlower Garden Banks National Marine Sanctuary off the coast of Louisiana.[69] Sanctuary officials said they believe the species will be a permanent fixture, but hope to monitor and possibly limit their presence.[citation needed]
Since lionfish thrive so well in the Atlantic and the Caribbean due to nutrient-rich waters and lack of predators, the species has spread tremendously. A single lionfish, located on a reef, reduced young juvenile reef fish populations by 79%.[70]
Red lionfish are an invasive species, yet relatively little is known about them. NOAA research foci include investigating biotechnical solutions for control of the population, and understanding how the larvae are dispersed.[71] Another important area of study is what controls the population in its native area. Researchers hope to discover what moderates lionfish populations in the Indo-Pacific and apply this information to control the invasive populations, without introducing additional invasive species.[citation needed]
Two new trap designs have been introduced to help with deep-water control of the lionfish. The traps are low and vertical and remain open the entire time of deployment. The vertical relief of the trap attracts lionfish, which makes catching them easier. These new traps are good for catching lionfish without affecting the native species that are ecologically, recreationally, and commercially important to the surrounding areas. These traps are more beneficial than older traps because they limit the potential of catching noninvasive creatures, they have bait that is only appealing to lionfish, they guarantee a catch, and they are easy to transport.[72]
Remotely Operated Vehicles (ROVs) are being developed to help hunt the lionfish. The Reefsweeper ROV uses a harpoon gun to snag its target. The vehicle is able to hunt fish that may not otherwise be obtainable through human intervention alone.[73]
Rigorous and repeated removal of lionfish from invaded waters could potentially control the exponential expansion of the lionfish in invaded waters.[4] A 2010 study showed effective maintenance would require the monthly harvest of at least 27% of the adult population. Because lionfish are able to reproduce monthly, this effort must be maintained throughout the entire year.[74]
To accomplish even these numbers seems unlikely, but as populations of lionfish continue to grow throughout the Caribbean and Western Atlantic, actions are being taken to attempt to control the quickly growing numbers. In November 2010, for the first time theFlorida Keys National Marine Sanctuary began licensing divers to kill lionfish inside the sanctuary in an attempt to eradicate the fish.[75]
Conservation groups and community organizations in the Eastern United States have organized hunting expeditions forPterois such as the Environment Education Foundation's 'lionfish derby' held annually in Florida.[56] Divemasters from Cozumel to the Honduran Bay Islands and at Reef Conservation International which operates in theSapodilla Cayes Marine Reserve off Punta Gorda, Belize, now routinely spear them during dives.[citation needed] While diver culling removes lionfish from shallow reefs reducing their densities,[76] lionfish have widely been reported on mesophotic coral ecosystems (reefs from 30 to 150 m) in the western Atlantic[77] and even in deep-sea habitats (greater than 200 m depth).[43] Recent studies have suggested that the effects of culling are likely to be depth-specific, and so have limited impacts on these deeper reef populations.[78] Therefore, other approaches such as trapping are advocated for removing lionfish from deeper reef habitats.[43][77][78][79]
Long-term culling has also been recorded to cause behavior changes in lionfish populations. For example, in the Bahamas, lionfish on heavily culled reefs have become more wary of divers and hide more within the reef structure during the day when culling occurs.[80] Similar lionfish responses to divers have been observed when comparing culled sites and sites without culling in Honduras, including altered lionfish behaviour on reefs too deep for regular culling, but adjacent to heavily culled sites potentially implying movement of individuals between depths.[78]
While culling by marine protection agencies and volunteer divers is an important element of control efforts, development of market-based approaches, which create commercial incentives for removals, has been seen as a means to sustain control efforts. The foremost of these market approaches is the promotion of lionfish as a food item.[81][82] Another is the use of lionfish spines, fins, and tails for jewelry and other decorative items. Lionfish jewelry production initiatives are underway in Belize, the Bahamas,[83] St. Vincent, and the Grenadines.
In 2014 atJardines de la Reina National Marine Park in Cuba, a diver experimented with spearing and feeding lionfish to sharks in an effort to teach them to seek out the fish as prey.[84] By 2016, Cuba was finding it more effective to fish for lionfish as food.[85]
In 2010, NOAA (which also encourages people to report lionfish sightings, to help track lionfish population dispersal)[86] began a campaign to encourage the consumption of the fish.[56] The "Lionfish as Food" campaign encourages human hunting of the fish as the only form of control known to date. Increasing the catch of lionfish could not only help maintain a reasonable population density, but also provide an alternative fishing source to overfished populations, such asgrouper andsnapper. The taste is described as "buttery and tender".[87][88] To promote the campaign, theRoman Catholic Church inColombia agreed to have their clergy's sermons suggest to their parishioners (84% of the population) eating lionfish on Fridays,Lent, andEaster, which proved highly successful in decreasing the invasive fish problem.[89]
When properly filleted, the naturally venomous fish is safe to eat. Some concern exists about the risk ofciguatera food poisoning (CFP) from the consumption of lionfish, and the FDA included lionfish on the list of species at risk for CFP when lionfish are harvested in some areas tested positive for ciguatera. No cases of CFP from the consumption of lionfish have been verified, and published research has found that the toxins in lionfish venom may be causing false positives in tests for the presence of ciguatera.[90][91] The Reef Environmental Education Foundation provides advice to restaurant chefs on how they can incorporate the fish into their menus. The NOAA calls the lionfish a "delicious, delicately flavored fish" similar in texture to grouper.[56] Cooking techniques and preparations for lionfish include deep-frying,ceviche,jerky, grilling, andsashimi.
Another initiative is centered around the production of leather from lionfish hides. It seeks to establish a production chain and market for high-quality leather produced from the hides. The goal is to control invasive lionfish populations while providing economic benefits to local fishing communities.[92]
It's a sweet, white flaky fish with a taste similar to a parrotfish or a snapper", John says. "It's super healthy, very delicate and tender, and it's easy to cook it just about any way you can think of.
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