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Ans 18 ans 17 black lip pearl oyster pinctada

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Unformatted text preview: n shall be exported to Japan for marketing. Japan dominants the pearl industry up to the 1990’s ANS 18 ANS 16 • 1980s - Australian and French Polynesian culture industries begin marketing pearls. ANS 18 ANS 17 BLACK-LIP PEARL OYSTER Pinctada margaritifera ANS 18 ANS 18 Hatchery development Traditionally, pearl oysters were obtained by natural spatfall, however, hatchery production is becoming more widespread. Hatcheries now provide a large proportion of the P. fucata in Japan. Private and government hatchery work has begun with P. maxima and P. margaritifera. While details are largely proprietary, they are undoubtedly similar to those developed for the Pacific oyster. ANS 18 ANS 19 • Initial grow-out – Culture pearl oysters are typically grown in mesh rearing structures. Mesh is cleaned regularly (every 6 weeks or more often in the summer) and the density gradually reduced. Mature ( ~ 2 years old) oysters (P. fucata - > 50 mm; P. margaritifera - > 100 mm; and P. maxima - > 120 mm. ANS 18 ANS 20 • Preoperative phase - O...
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