Pearl Oysters


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Pearl Oysters

 

the common name for marine and fresh-water bivalve mollusks in whose mantles pearls can form. Marine oysters of the genus Pinctada, with round shells, live in tropical waters and are harvested for their pearls. In Japan they are raised. Freshwater oysters of the species P. margaritifera, with kidney-shaped shells, live in temperate climates in rivers with pure, clear water. The insides of oyster shells are covered with a thick layer of mother-of-pearl, which is used to make buttons and other articles.

REFERENCE

Ivanov, A. V. Promvslovve vodnye bespozvonochnve. Moscow, 1955.
References in periodicals archive ?
Production of byssus in pearl oysters has been observed to be influenced by many factors including water temperature, pH (Welladsen et al.
The pearl oyster, Pinctada fucata, is a bivalve that is cultured for pearl production in Guangdong, Guangxi and Hainan of China.
Digital image analysis of lipid and protein histochemical markers for measuring oocyte development and quality in pearl oyster Pinctada mazatlanica (Hanley, 1856).
Most of the pearls you see are cultivated or come from pearl oysters.
South Sea cultured pearls come from one of the world's largest pearl oyster (Pinctada maxima), which produces cultured pearls 15 mm and larger.
The new patch of shaped china substrate is located on the thin part of the tear-drop shaped seabed summit or mound that is also bound to the northwest by a large crop of sea grass from which tiny Gulf Pearl oysters are starting out in life.
Because there is not a culture method designed for pearl oysters in Santa Catarina State, Brazil, the usual methodology for the culture of juveniles of the Japanese oyster, Crassotrea gigas, was utilized.
The spiral shape of the shell makes it virtually impossible to reach the gonad, one of the pearl-forming portions in pearl oysters, without endangering the animal's life.
The teams are still exploring the best way to culture the sponges, but the main methods are to either thread the sponge pieces (like donuts) on a rope, which is then suspended in the water, of to place them in mesh pearl panels, normally used to culture pearl oysters.
Jean-Marie Domard hired Japanese grafters to implant nuclei into 5,000 pinctada magaretifira, or black pearl oysters.
According to local legend, the pearl oysters would swim to the surface when it rained and open up wide to catch a raindrop; once inside, the droplet would metamorphose into the coveted gem.
The Spanish subsequently organized harvesting programs for pearl oysters in Venezuela and Colombia and began to ship huge quantities of pearls to Spain and other European countries for ladies adornment.