Download e-book for kindle: The Pearl Oyster by Paul Southgate, John Lucas

By Paul Southgate, John Lucas

ISBN-10: 0444529764

ISBN-13: 9780444529763

ISBN-10: 1865843830

ISBN-13: 9781865843834

Opposite to a ordinarily held view that pearls are discovered unintentionally in oysters, just about all are actually made out of farms. This e-book is a finished therapy of all points of the biology of pearl oysters, their anatomy, replica, genetics, ailments, and so forth. It considers how they're farmed from spawning and culturing larvae in hatcheries to adults within the ocean; how numerous environmental elements, together with pollutants impact them; how sleek concepts are effectively generating huge numbers of cultured pearls. this can be the final word reference resource on pearl oysters and the tradition of pearls, written and edited through a few scientists who're global specialists of their fields. . entire therapy of pearl oyster biology and pearl tradition . Written by way of the head global professionals . hugely illustrated and figured . Of functional relevance to a vast readership, from expert biologists to these serious about the practicalities and perform of pearl construction.

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Recent phylogenetic analyses aimed at resolving higher-level relationships within the subclass Pteriomorphia or, more narrowly, within the superfamily Pterioidea based on molecular (Steiner and Hammer, 2000; Giribet and Distel, 2003; Matsumoto, 2003; Tëmkin, 2004) and morphological (Tëmkin, 2004, 2006a) data indicated that Pteriidae is not a natural (monophyletic) group. 4). 2. Generic descriptions The genera of Pteriidae have traditionally been defined by shell shape (Hertlein and Cox, 1969; Hayes, 1972; Habe, 1977; Oliver, 1992; Lamprell and Healy, 1998).

The first pearl boom was already over in 1543, due to reckless plundering, and fishing came to an end in the 17th century. The pearl grounds stretched over a length of 800 km from Paria Peninsula to Coro, including a number of small islands to the south of Margarita Island. After a break of nearly 200 years the pearl industry started again in 1823, when the Congress of Great Colombia granted the monopoly for pearl fishing to Bridge & Rundell, an English company. Soon the threat of overfishing arose once more and the government banned dredging.

Other significant areas are Hainan Island, Leizhou Peninsula in Guangdong Province and the Strait of Taiwan between Fujian and Taiwan Island (Fig. 11). Pearls are mentioned in old scripts dating from the third millennium bc. Until the 19th century, large pearls were used to decorate caps and dresses worn by mandarins. The pearls were drilled with two holes, like a button, so that they could be sewn on. The double drilling reduced the value of a pearl, at least from the point of view of the Western market.

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The Pearl Oyster by Paul Southgate, John Lucas

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