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Pinctada is a genus of saltwater oysters, marine bivalve mollusks in the family Pteriidae. These pearl oysters have a strong inner shell layer composed of nacre, also known as "mother of pearl". Pearl oysters are not closely related to either the edible oysters of family Ostreidae or the freshwater pearl mussels of the families Unionidae and ...
The largest pearl-bearing oyster is the marine Pinctada maxima, which is roughly the size of a dinner plate. Not all individual oysters produce pearls. In nature, pearl oysters produce pearls by covering a minute invasive object with nacre. Over the years, the irritating object is covered with enough layers of nacre to become a pearl.
The Hong Kong oyster (Magallana hongkongensis), is a species of true oyster found in Hong Kong and the mouth of Pearl River in China. The species was uniquely identified by comparing the genetic distances of mitochondrial DNA sequences. [1] The species has a long cultivation history for over 700 years. It is a sister taxon of Magallana nippona.
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 ...
Pinctada maxima is a species of pearl oyster, a marine bivalve mollusk in the family Pteriidae, the pearl oysters. There are two different color varieties: the Gold-lipped oyster and the Silver-lipped oyster. These bivalves are the largest pearl oysters in the world.
Divers manually pulled oysters from ocean floors and river bottoms and checked them individually for pearls. Not all mussels and oysters produce pearls. In a haul of three tons, only three or four oysters will produce perfect pearls. [citation needed]
The project will clean up to 1.2 million gallons of water a day from the river in the first year. ... up to 24,000 oysters will be working 24/7 to filter out algae and remove nutrients from the ...
This oyster along with the Pacific wing-oyster (Pteria sterna) was the subject of a pearl fishery in the Gulf of California since before the arrival of Hernando Cortez in 1535. The Spaniards quickly appreciated the value of the harvest and in 1586 declared the gathering of oysters to be a right of the Spanish crown . [ 10 ]