Pearl hunting is the activity of recovering pearls from wild mollusks, usually oysters or mussels, in the sea or fresh water. Pearl hunting used to be prevalent in the Persian Gulf region and Japan, but also occurred in other regions. In most cases the pearl-bearing mulluscs live at depths where they are not manually accessible from the surface, and diving or the use of some form of tool is needed to reach them. Historically the mulluscs were retrieved by freediving, a technique where the diver descends to the bottom, collects what they can, and surfaces on a single breath. The diving mask improved the ability of the diver to see while underwater. When the surface-supplied diving helmet became available for underwater work, it was also applied to the task of pearl hunting, and the associated activity of collecting pearl shell as a raw material for the manufacture of buttons, inlays and other decorative work. The surface supplied diving helmet greatly extended the time the diver could stay at depth, and introduced the previously unfamiliar hazards of barotrauma of ascent and decompression sickness.
A pearl is a hard, glistening object produced within the soft tissue of a living shelled mollusk or another animal, such as a conulariid. Just like the shell of a mollusk, a pearl is composed of calcium carbonate in minute crystalline form, which has been deposited in concentric layers. The ideal pearl is perfectly round and smooth, but many other shapes, known as baroque pearl can occur. The finest quality of natural pearls have been highly valued as gemstones and objects of beauty for many centuries. Because of this, pearl has become a metaphor for something rare, fine, admirable and valuable.
Oyster is the common name for a number of different families of salt-water bivalve molluscs that live in marine or brackish habitats. In some species the valves are highly calcified, and many are somewhat irregular in shape. Many, but not all, oysters are in the superfamily Ostreoidea.
The Persian Gulf is a mediterranean sea in Western Asia. The body of water is an extension of the Indian Ocean through the Strait of Hormuz and lies between Iran to the northeast and the Arabian Peninsula to the southwest. The Shatt al-Arab river delta forms the northwest shoreline.
Before the beginning of the 20th century, the only means of obtaining pearls was by manually gathering very large numbers of pearl oysters or mussels from the ocean floor or lake or river bottom. The bivalves were then brought to the surface, opened, and the tissues searched. More than a ton were searched in order to find at least 3-4 quality beds.[ citation needed ]
In order to find enough pearl oysters, free-divers were often forced to descend to depths of over 100 feet on a single breath, exposing them to the dangers of hostile creatures, waves, eye damage, and drowning, often as a result of shallow water blackout on resurfacing. [ which? ] was forced to strictly regulate the harvest to prevent the oysters from becoming extinct,[ citation needed ] and the Mexican government banned all pearl harvesting from 1942 to 1963.Because of the difficulty of diving and the unpredictable nature of natural pearl growth in pearl oysters, pearls of the time were extremely rare and of varying quality. The Great Depression in the United States made it hard to get good prices for pearl shell. The natural pearls found from harvested oysters were a rare bonus for the divers. Many fabulous specimens were found over the years. By the 1930s, overharvesting had severely depleted the oyster beds. The government
Drowning is defined as respiratory impairment as a result of being in or under a liquid. Drowning typically occurs silently, with only a few people able to wave their hands or call for help. Symptoms following rescue may include breathing problems, vomiting, confusion, or unconsciousness. Occasionally symptoms may not appear until up to six hours afterwards. Drowning may be complicated by low body temperature, aspiration of vomit, or acute respiratory distress syndrome.
The Great Depression was a severe worldwide economic depression that took place mostly during the 1930s, beginning in the United States. The timing of the Great Depression varied across nations; in most countries, it started in 1929 and lasted until the late 1930s. It was the longest, deepest, and most widespread depression of the 20th century. In the 21st century, the Great Depression is commonly used as an example of how intensely the world's economy can decline.
In Asia, some pearl oysters could be found on shoals at a depth of 5–7 feet (1.325–2 meters) from the surface, but more often divers had to go 40 feet (12 meters) or even up to 125 feet (40 meters) deep to find enough pearl oysters, and these deep dives were extremely hazardous to the divers. In the 19th century, divers in Asia had only very basic forms of technology to aid their survival at such depths. For example, in some areas they greased their bodies to conserve heat, put greased cotton in their ears, wore a tortoise-shell clip to close their nostrils, gripped a large object like a rock to descend without the wasteful effort of swimming down, and had a wide-mouthed basket or net to hold the oysters.
For thousands of years, most seawater pearls were retrieved by divers working in the Indian Ocean, in areas such as the Persian Gulf, the Red Sea, and in the Gulf of Mannar (between Sri Lanka and India).A fragment of Isidore of Charax's Parthian itinerary was preserved in Athenaeus's 3rd-century Sophists at Dinner , recording freediving for pearls around an island in the Persian Gulf.
The Red Sea is a seawater inlet of the Indian Ocean, lying between Africa and Asia. The connection to the ocean is in the south through the Bab el Mandeb strait and the Gulf of Aden. To the north lie the Sinai Peninsula, the Gulf of Aqaba, and the Gulf of Suez. The Red Sea is a Global 200 ecoregion. The sea is underlain by the Red Sea Rift which is part of the Great Rift Valley.
The Gulf of Mannar is a large shallow bay forming part of the Laccadive Sea in the Indian Ocean. It lies between the west coast of Sri Lanka and the southeastern tip of India, in the Coromandel Coast region. The chain of low islands and reefs known as Ramsethu, also called Adam's Bridge, which includes Mannar Island, separates the Gulf of Mannar from Palk Bay, which lies to the north between Sri Lanka and India. The Malvathu Oya of Sri Lanka and the estuaries of Thamirabarani River and Vaipar River of South India drain into the Gulf. The dugong is found here.
Sri Lanka, officially the Democratic Socialist Republic of Sri Lanka, is an island country in South Asia, located in the Indian Ocean to the southwest of the Bay of Bengal and to the southeast of the Arabian Sea. The island is geographically separated from the Indian subcontinent by the Gulf of Mannar and the Palk Strait. The legislative capital, Sri Jayawardenepura Kotte, is a suburb of the commercial capital and largest city, Colombo.
Pearl divers near the Philippines were also successful at harvesting large pearls, especially in the Sulu Archipelago. In fact, pearls from the Sulu Archipelago were considered the "finest of the world" which were found in "high bred" shells in deep, clear, and rapid tidal waters. At times, the largest pearls belonged by law to the sultan, and selling them could result in the death penalty for the seller. Nonetheless many pearls made it out of the archipelago by stealth, ending up in the possession of the wealthiest families in Europe.Pearling was popular in Qatar, Bahrain, Kuwait, Japan, India and some areas in Persian Gulf countries. The Gulf of Mexico was particularly famous for pearling, which was originally found by the Spanish explorers.
The Philippines, officially the Republic of the Philippines, is an archipelagic country in Southeast Asia. Situated in the western Pacific Ocean, it consists of about 7,641 islands that are categorized broadly under three main geographical divisions from north to south: Luzon, Visayas and Mindanao. The capital city of the Philippines is Manila and the most populous city is Quezon City, both part of Metro Manila. Bounded by the South China Sea on the west, the Philippine Sea on the east and the Celebes Sea on the southwest, the Philippines shares maritime borders with Taiwan to the north, Japan to the northeast, Vietnam to the west, Palau to the east, and Malaysia and Indonesia to the south.
The Sulu Archipelago is a chain of islands in the Pacific Ocean, in the southwestern Philippines. The archipelago forms the northern limit of the Celebes Sea and southern limit of the Sulu Sea. The Sulu Archipelago islands are within the Mindanao island group, consisting of the provinces of Basilan, Sulu, and Tawi-Tawi.
In a similar manner as in Asia, Native Americans harvested freshwater pearls from lakes and rivers like the Ohio, Tennessee, and Mississippi, while others successfully retrieved marine pearls from the Caribbean and waters along the coasts of Central and South America.
In the time of colonial slavery in northern South America (off the northern coasts of modern Colombia and Venezuela), a unique occupation amongst slaves was that of a pearl diver. A diver's career was often short-lived because the waters being searched were known to be shark-infested, resulting in frequent attacks on divers. However, a slave who discovered a great pearl could sometimes purchase his freedom.
During the first half of the sixteenth century, Spaniards discovered the extensive pearl oyster beds that existed on the Caribbean coast of Venezuela, particularly in the vicinity of Margarita Island. Indigenous slavery was easy to establish in this area because it had not yet been outlawed; therefore, indigenous peoples were captured and often forced to work as pearl divers. Since violence could not protect the efficiency of the slave trade, coastal chieftains established a ransoming system known as the "rescate" system.
As this system continued to grow, more and more oyster beds were discovered along the Latin American coast, including near Riohacha on Colombia's Guijara Peninsula. However, due to over-exploitation of both indigenous labor and the oyster beds, the Spanish pearl economy soon plummeted. By 1540, previous Spanish settlements along the coast had been abandoned as the Spanish looked elsewhere for more labor and newer markets. The pearl industry was partially revived in the late sixteenth century when Spaniards replaced indigenous labor with African slave labor.
Oyster harvesting methods remained much the same along the coast and varied depending on the divers' conditions,[ clarification needed ] the region's topography, and a Spanish master's work demands.
On Margarita Island, small zones were inspected in advance by the divers, who relied on breath-hold endurance to dive and resurface. Once those small zones had been depleted of their oysters, the men on the boat - which usually included a dozen divers, a Spanish navigator, a diving chief, an oarsmen, and a foreman - moved on to the next oyster bed. To retrieve the pearls, the divers carried a small net that had one end tied to the boat and the other end tied to the fishing net.[ clarification needed ] The shells that they extracted were usually placed in this basket, but for dives of greater depth, the divers also had to wear stones tied to their bodies as they submerged into the ocean. The stones acted as a ballast until they resurfaced, where the divers then untied the stones from their bodies.[ clarification needed ] The divers would receive a slight break to eat and rest and continue this work until sundown, where they all presented their catch to the foreman, return to the ranchería to have some dinner, and then open the oyster shells.
The divers were locked in their quarters at night by the Spaniards, who believed that if the divers (who were mostly male) compromised their chastity, they would not be able to submerge but rather float on the water. The divers who either had a small catch or rebelled were beaten with whips and tied in shackles. The working day lasted from dawn till dusk and being underwater, along with bruises, could affect the health of some divers. Furthermore, it is well known that the coastal waters were often infested with sharks, so shark attacks were quite frequent as well. As the fisheries continued to diminish, slaves hid some of the valuable pearls and exchanged them for clothing with their bosses.
On Cubagua, another Venezuelan island, the Spaniards used natives as slave labor in their initial attempts to establish a thriving pearl market in this area. Indians, especially those from Lucayo in the Bahamas, were taken as slaves to Cubagua since their diving skills and swimming capabilities were known to be superb. Likewise, the Spaniards began to import African slaves as the indigenous populations died off from disease and over-exploitation and Africans became so preferred by the Spanish over indigenous labor that a royal decree of 1558 decreed that only Africans (and no natives) should be used for pearl diving. Like other pearl diving groups controlled by the Spanish, the pearl divers could be treated harshly based on their daily pearl retrieval. Unlike the other pearl diving groups, however, the divers on Cubagua were marked by a hot iron on their face and arms with the letter "C," which some scholars argue stood for Cubagua.
The pearl diving process in Cubagua varied slightly from other Spanish pearl diving practices. Here, there were six divers per boat and divers worked together in pairs to collect the pearls. These pearl divers used small pouches tied to their necks to collect the oysters from the sea bottom. Some scholars have reported that because of the climate in Cubagua, the heat would cause the oysters to open themselves, making the pearl extraction process a bit simpler. Natives, unlike Africans, were given less rest time and could potentially be thrown off the boat or whipped to commence work sooner. Similar to slaves on Margarita Island, all pearl diving slaves were chained at night to prevent escape; in addition, deaths not only resulted from shark attacks, but also from hemorrhaging caused by rapid surfacing from the water[ clarification needed ] and intestinal issues induced by constant reentry into cold water.
Diver groups in the Panamanian fisheries were larger than those on Margarita Island, usually comprising 18 - 20 divers. Instead of net bags, these divers surfaced with oysters under their armpits or even in their mouths, placing their catch in a cloth bag on board the ship. Each diver would continue to submerge until he was out of breath or extremely tired, but also after they had met their fixed quota for the day. Once the bags were full, the divers caught another breath and immediately began pearl extraction aboard the vessel, handing the pearls to the foreman who accounted for both imperfect and perfect pearls. Excess pearls were given to the divers who could sell them to the vessel owner at a just price; in contrast, if the divers did not meet their daily quota, they would either use their reserve pearls to fulfill the quota for the next day or write that amount of pearls into a debt account. Like the Venezuelan divers, the Panamanian divers also faced the danger of shark attacks, although they usually carried knives to defend themselves.
Today, pearl diving has largely been supplanted by cultured pearl farms, which use a process widely popularized and promoted by Japanese entrepreneur Kōkichi Mikimoto. Particles implanted in the oyster encourage the formation of pearls, and allow for more predictable production. Today's pearl industry produces billions of pearls every year.[ citation needed ] Ama divers still work, primarily now for the tourist industry.
Pearl diving in the Ohio and Tennessee rivers of the United States still exists today.[ citation needed ] Pearling in Highland rivers in Scotland was prohibited in 1995 after the mussel population was driven to near extinction, see Pearl#British_Isles.
Freediving, free-diving, free diving, breath-hold diving, or skin diving is a form of underwater diving that relies on breath-holding until resurfacing rather than the use of breathing apparatus such as scuba gear.
The eastern oyster —also called Wellfleet oyster, Atlantic oyster, Virginia oyster, or American oyster—is a species of true oyster native to the eastern seaboard and Gulf of Mexico coast of North America. It is also farmed in Puget Sound, Washington, where it is known as the Totten Inlet Virginica. Eastern oysters are and have been very popular commercially. Today, less than 1% of the original 17th-century population is thought to remain in the Chesapeake Bay and its tributaries, although population estimates from any era are uncertain. The eastern oyster is the state shellfish of Connecticut, its shell is the state shell of Virginia and Mississippi, and its shell in cabochon form is the state gem of Louisiana.
Standard diving dress is a type of diving suit that was formerly used for all underwater work that required more than breath-hold duration, which included marine salvage, civil engineering, pearl shell diving and other commercial diving work, and similar naval diving applications. Standard diving dress has largely been superseded by lighter and more comfortable equipment.
Ama, uminchu or kaito are Japanese divers, famous for collecting pearls. The majority of ama are women.
Rangiroa or Te Kokōta is the largest atoll in the Tuamotus and one of the largest in the world.
Solo diving is the practice of underwater diving without a "dive buddy", particularly with reference to scuba diving, but the term is also applied to freediving. Surface supplied diving and atmospheric suit diving are single diver underwater activities but are accompanied by an on-surface support team dedicated to the safety of the diver, and not considered solo diving in its truest sense.
Haenyeo are female divers in the Korean province of Jeju. Known for their independent spirit, iron will and determination, the haenyeo are representative of the semi-matriarchal family structure of Jeju.
Shark cage diving is underwater diving or snorkeling where the observer remains inside a protective cage designed to prevent sharks from making contact with the divers. Shark cage diving is used for scientific observation, underwater cinematography, and as a tourist activity. Sharks may be attracted to the vicinity of the cage by the use of bait, in a procedure known as chumming, which has attracted some controversy as it is claimed to potentially alter the natural behaviour of sharks in the vicinity of swimmers.
Underwater diving, as a human activity, is the practice of descending below the water's surface to interact with the environment. Immersion in water and exposure to high ambient pressure have physiological effects that limit the depths and duration possible in ambient pressure diving. Humans are not physiologically and anatomically well adapted to the environmental conditions of diving, and various equipment has been developed to extend the depth and duration of human dives, and allow different types of work to be done.
Freediving blackout, breath-hold blackout or apnea blackout is a class of hypoxic blackout, a loss of consciousness caused by cerebral hypoxia towards the end of a breath-hold dive, when the swimmer does not necessarily experience an urgent need to breathe and has no other obvious medical condition that might have caused it. It can be provoked by hyperventilating just before a dive, or as a consequence of the pressure reduction on ascent, or a combination of these. Victims are often established practitioners of breath-hold diving, are fit, strong swimmers and have not experienced problems before. Blackout may also be referred to as a syncope or fainting.
Pearling in Western Australia existed well before European settlement. Coastal dwelling Aboriginal people had collected and traded pearl shell as well as trepang and tortoise with fisherman from Sulawesi for possibly hundreds of years. After settlement the Aborigines were used as slave labour in the emerging commercial industry. Pearling centred first around Nickol Bay and Exmouth Gulf and then around Broome to become the largest in the world by 1910. The farming of cultured pearls remains an important part of the Kimberley economy, worth $67 million in 2014 and is the second largest fisheries industry in WA after rock lobster.
Cubagua or Isla de Cubagua is the smallest and least populated of the three islands constituting the Venezuelan state of Nueva Esparta, after Isla Margarita and Coche. It is located 16 kilometres (10 mi) north of Araya Peninsula, the closest mainland area.
In underwater diving, ascending and descending is done using strict protocols to avoid problems caused by the changes in ambient pressure and the hazards of obstacles near the surface or collision with vessels. Diver certification and accreditation organisations place importance on these protocols early in their diver training programmes.
Diego Caballero was a Spanish merchant and minor Conquistador in the Caribbean area and in the islands off the coast of Venezuela. He organised raids on natives, whom he then used as slaves in pearl fishing and other enterprises. He amassed enormous wealth in America, which he invested in further enterprises throughout the Spanish Empire. He thus became enormously wealthy, perhaps the most important Spanish merchant of his day. He held, or purchased, several official posts, in the service of the King, Charles V and in Seville.
Nueva Cádiz is an archaeological site and former port town on Cubagua, off the coast of Venezuela. First established in 1500 as a seasonal settlement, by 1515 it had become a year-round permanent town. it was one of the first settlements in the Americas. The settlement was given the name Nueva Cádiz when it was incorporated as a city in 1528.
An emergency ascent is an ascent to the surface by a diver in an emergency. More specifically it refers to any of several procedures for reaching the surface in the event of an out-of-air emergency, generally while scuba diving.
Pteria sterna, commonly known as the rainbow-lipped pearl oyster or the Pacific wing-oyster, is a species of marine bivalve mollusk in the family Pteriidae, the pearl oysters. This oyster can be found in shallow water along the tropical and subtropical Pacific coast of America, its range including Baja California, Mexico and northern Peru.
Pinctada mazatlanica is a species of tropical marine bivalve mollusc in the family Pteriidae, the pearl oysters. It is native to shallow waters on the Pacific coast of Central America where its range includes both northern and southern Mexico and Panama.
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