The Florida Reef (also known as the Great Florida Reef, Florida reefs, Florida Reef Tract and Florida Keys Reef Tract) is the only living coral barrier reef in the continental United States.
 It is the third largest coral barrier reef system in the world (after the Great Barrier Reef and Belize Barrier Reef).
 It lies a few miles seaward of the Florida Keys, is about 4 miles (6 to 7 km) wide and extends (along the 20 meter depth contour) 270 km from Fowey Rocks just east of Soldier Key to just south of the Marquesas Keys.
 The barrier reef tract forms a great arc, concentric with the Florida Keys, with the northern end, in Biscayne National Park, oriented north-south and the western end, south of the Marquesas Keys, oriented east-west.
 The rest of the reef outside Biscayne National Park lies within John Pennekamp Coral Reef State Park and the Florida Keys National Marine Sanctuary.
 Isolated coral patch reefs occur northward from Biscayne National Park as far as Stuart, in Martin County.
 Coral reefs are also found in Dry Tortugas National Park west of the Marquesas Keys.
 There are more than 6,000 individual reefs in the system.
 The reefs are 5,000 to 7,000 years old, having developed since sea levels rose following the Wisconsinan glaciation.
Enneapterygius atrogulare is a species of triplefin blenny in the genus "Enneapterygius".
 Although it is known as the blackthroat triplefin in the United Kingdom, it is also known as the ring-scale triplefin, black triplefin, eastern white-barred threefin, ringed triplefin, eastern Australian blackhead triplefin or the saddled triplefin in Australia.
 It is a subtropical, non-migratory blenny found in coral reefs in the western Pacific Ocean, around Australia and Tonga.
 Blackthroat triplefins swim at a depth range of 0-5 metres, and both juveniles and adults feed primarily on benthic algae, weeds, and invertebrates.
 Male "E. atrogulare" can reach a maximum length of 5 centimetres.
The resilience of coral reefs is the biological ability of coral reefs to recover from natural disturbances such as storms and bleaching episodes.
 Resilience refers to the ability of biological or social systems to overcome pressures and stresses by maintaining key functions through resisting or adapting to change.
 Reef resistance measures how well coral reefs tolerate changes in ocean chemistry, sea level, and sea surface temperature.
 Reef resistance and resilience are important factors in coral reef recovery from the effects of ocean acidification.
 Natural reef resilience can be used as a recovery model for coral reefs and an opportunity for management in marine protected areas (MPAs).
The Structure and Distribution of Coral Reefs, Being the first part of the geology of the voyage of the Beagle, under the command of Capt. Fitzroy, R.N. during the years 1832 to 1836, was published in 1842 as Charles Darwin's first monograph, and set out his theory of the formation of coral reefs and atolls.
 He conceived of the idea during the voyage of the "Beagle" while still in South America, before he had seen a coral island, and wrote it out as HMS "Beagle" crossed the Pacific Ocean, completing his draft by November 1835.
 At the time there was great scientific interest in the way that coral reefs formed, and Captain Robert FitzRoy's orders from the Admiralty included the investigation of an atoll as an important scientific aim of the voyage.
 FitzRoy chose to survey the Keeling Islands in the Indian Ocean.
 The results supported Darwin's theory that the various types of coral reefs and atolls could be explained by uplift and subsidence of vast areas of the Earth's crust under the oceans.
Human impact on coral reefs is significant.
 Coral reefs are dying around the world.
 Damaging activities include coral mining, pollution (organic and non-organic), overfishing, blast fishing, the digging of canals and access into islands and bays.
 Other dangers include disease, destructive fishing practices and warming oceans.
 Factors that affect coral reefs include the ocean's role as a carbon dioxide sink, atmospheric changes, ultraviolet light, ocean acidification, viruses, impacts of dust storms carrying agents to far-flung reefs, pollutants, algal blooms and others.
 Reefs are threatened well beyond coastal areas.
 Warming causes coral bleaching, which if severe kills the coral.
Coral reefs are diverse underwater ecosystems held together by calcium carbonate structures secreted by corals. Coral reefs are built by colonies of tiny animals found in marine water that contain few nutrients.
 Most coral reefs are built from stony corals, which in turn consist of polyps that cluster in groups.
 The polyps belong to a group of animals known as Cnidaria, which also includes sea anemones and jellyfish.
 Unlike sea anemones, corals secrete hard carbonate exoskeletons which support and protect the coral polyps.
 Most reefs grow best in warm, shallow, clear, sunny and agitated water.
Midway Atoll ( ; also called Midway Island and Midway Islands; Hawaiian: "Pihemanu Kauihelani") is a 2.4 sqmi atoll in the North Pacific Ocean at .
 As its name suggests, Midway is roughly equidistant between North America and Asia.
 Midway Atoll is an unorganized, unincorporated territory of the United States.
 Midway continues to be the only island in the Hawaiian archipelago that is not part of the state of Hawaii.
 Unlike the other Hawaiian islands, Midway observes Samoa Time (, i.e., eleven hours behind Coordinated Universal Time), which is one hour behind the time in the state of Hawaii.
 For statistical purposes, Midway is grouped as one of the United States Minor Outlying Islands.
 The Midway Atoll National Wildlife Refuge, encompassing 590991.50 acre of land and water (mostly water) in the surrounding area, is administered by the United States Fish and Wildlife Service (FWS).
 The refuge and most of its surrounding area are part of the larger Papahānaumokuākea Marine National Monument.
The Halfblack triplefin (Enneapterygius hemimelas), also known as the Half-black triplefin, Blackbelly triplefin, or the Green-tail threefin, is a species of triplefin blenny in the genus "Enneapterygius".
 It was originally described by R. Kner and F. Steindachner in 1867.
 It is a non-migratory tropical blenny known from coral reefs in the western Pacific Ocean, and has been described from the Ryukyu Islands to eastern Australia.
 It has been recorded swimming at a depth range of 0-30 metres (0-98.4 feet).
Southeast Asian coral reefs have the highest levels of biodiversity for the world's marine ecosystems.
 They serve many functions, such as forming the livelihood for subsistence fishermen and even function as jewelry and construction materials.
 Coral reefs are developed by the carbonate-based skeletons of a variety of animals and algae.
 Slowly and overtime, the reefs build up to the surface in oceans.
 Coral reefs are found in shallow, warm salt water.
 The sunlight filters through clear water and allows microscopic organisms to live and reproduce.
 The Indian Ocean holds 60% of the world's coastal reefs, 25% are in the Pacific and 15% are in the western Atlantic.
 There are coral reefs in the Persian Gulf, Madagascar, the Philippines, Hawaiian Islands and off Southeast Asia.
 Coral reefs have been preserved and identified in rocks over 400 million years old.
 Coral reefs are actually composed of tiny, fragile animals known as coral polyps.
 Coral reefs are significantly important because of the biodiversity.
 Although the number of fish are decreasing, the remaining coral reefs contain more unique sea creatures.
 The variety of species living on a coral reef is greater than anywhere else in the world.
 An estimation of 70-90% of fish caught are dependent on coral reefs in Southeast Asia and reefs support over 25% of all known marine species.
 However, those sensitive coral reefs are facing detrimental effects on them due to variety of factors: overfishing, sedimentation and pollution, bleaching, and even tourist-related damage.
The Hawaiian blackhead triplefin (Enneapterygius atriceps), also known as the Hawaiian triplefin in Hawaii, is a species of triplefin blenny in the genus "Enneapterygius".
 It is a tropical blenny found in coral reefs in the Pacific Ocean, from the Hawaiian Islands, French Frigate Shoals, Laysan Island, and Midway Atoll.
 Blennies in this species swim at a depth range of 1-23 metres, and inhabit dead coral and rock.

Question: The Hawaiian blackhead triplefin found in coral reefs from an unorganized, unincorporated territory of what nation?
Answer: United States