Saltwater Freshwater Pearls
January 19, 2012 by staff
Saltwter Freshwater Pearls, Pearl oysters are saltwter clams, marine bivalve molluscs of the genus Pinctada in the family Pteriidae. They 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 Margaritiferidae.
Pinctada maxima pearl oysters are the only oyster that produces South Sea pearls. Currently cultured primarily in Australia and Tahiti.
All species within the genus share the phycological properties that can lead to them making large pearls of commercial value. Attempts have been made to harvest pearls commercially from many Pinctada species. However, the only species that are currently of significant commercial interest are:
Gulf pearl oyster, Pinctada radiata; Persian Gulf, Red Sea, Mediterranean Sea and throughout the Indo-Pacific as far as Japan and Australia.
Black-lip oyster, Pinctada margaritifera; Persian Gulf and southwestern part of Indian Ocean; Fiji; Tahiti; Myanmar; Baja California; Gulf of Mexico
Gold-lip oyster, Pinctada maxima; Australia; Fiji; Tahiti;
White-lip oyster, Pinctada maxima; Australia; Fiji; Tahiti; Myanmar;
Akoya pearl oyster or Akoya pearl oyster, Pinctada fucata (also called P. imbricata), Red Sea; Sri Lanka; Persian Gulf; Indian Ocean; Western Pacific Ocean; Australia; China;
Shark Bay pearl oyster Pinctada albina; Australia
Pearl oysters waiting to be opened
Opening and extracting pearls from farmed pearl oysters
Cultivated pearl oyster (from Japan Shima, Mie)
The species of Pinctada produce different maximum sizes and colors of pearls, depending on the size of the species and the natural color of the nacre inside the shell. Black South Sea pearls, or Tahitian pearls come from the black-lip oyster; white and golden South Sea pearls from the white-lip and golden-lip oysters; and Akoya cultured pearls from Pinctada fucata martensii, the Akoya pearl oyster.
Pearls are also obtained in commercial quantities from some species of the closely related winged oyster genus Pteria.
Pearls are also produced from freshwater mussel species unrelated to pearl oysters. These freshwater species include Hyriopsis cumingii, Hyriopsis schlegelii, and a hybrid of the two species.
At danger from the large demand for pearls, the typical lifespan of a pearl oyster is usually around 3 years to 14 years. Pinctada maxima are seeded at about 2 years of age and take 2 years to fully develop a pearl. They can be reseeded up to 3 or 4 times. Akoya pearls are harvested after about 9 to 16 months
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