The Pearl Oyster by Paul Southgate, John Lucas
By Paul Southgate, John Lucas
Opposite to a as a rule held view that pearls are came across accidentally in oysters, just about all are actually made out of farms. This ebook is a complete remedy of all facets of the biology of pearl oysters, their anatomy, replica, genetics, illnesses, and so on. It considers how they're farmed from spawning and culturing larvae in hatcheries to adults within the ocean; how quite a few environmental components, together with pollutants have an effect on them; how glossy recommendations are effectively generating huge numbers of cultured pearls. this is often the last word reference resource on pearl oysters and the tradition of pearls, written and edited by means of a couple of scientists who're international specialists of their fields. . complete therapy of pearl oyster biology and pearl tradition . Written by way of the pinnacle international specialists . hugely illustrated and figured . Of useful relevance to a vast readership, from expert biologists to these eager about the practicalities and perform of pearl construction.
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Additional resources for The Pearl Oyster
The exterior shell surface sculpture consists of commarginal periostracal and, in some species, calcitic scales that typically abrade with age. The hinge teeth are represented by an anterior subumbonal tooth in the left valve and a posterior submarginal oblique ridge in the right valve with complementary sockets in respective opposite valves. The adductor muscle is oval-shaped with the distal extremities of the posterior pedo-byssal retractor muscle adjacent or proximal to its anterior border. The byssus is composed of fused byssal threads that emerge from the base of the byssal groove ventral to the short foot.
Pearls still came regularly on the market during the 19th century, and the European MOP industry discovered shells from Panama around 1850. Soon several hundred divers worked in the Gulf of Panama, ﬁshing for the rather thick shells with their dark rim. The “Panama Shell” or “Bullock Shell” were less valuable than Australian shells. 34 Introduction Pearls, at ﬁrst rather a by-product of the ﬁsheries, became fashionable on the European market around 1900, due to the popularity of Paciﬁc pearls that they resembled.
They also did not know how to drill them. When black pearls came into fashion in the second half of the 19th century, middlemen and agents of well-known Paris companies resided permanently in Papeete so that they could make an immediate offer once a spectacular pearl had been found. The pearl grounds of New Caledonia were already overﬁshed by 1910. Many Paciﬁc islands suffered a similar fate, especially Hawaii. ) Pearl divers on an island in the Tuamoto Archipelago, around 1900. 7. Central America 31 for a short period on Pearl and Hermes Reef between 1927 and 1930 for factories in New York and San Francisco.