IFREMER, Centre du Pacifique, BP 7004, 98719 Taravao, Tahiti, French Polynesia.
Mar Pollut Bull. 2012;65(10-12):463-70. doi: 10.1016/j.marpolbul.2012.03.027. Epub 2012 May 2.
Pearl culture industry represents one of the dominant business sector of French Polynesia. However, it still entirely relies on unpredictable spat collection success. Our aim was to assess the influence of natural plankton concentration fluctuations on maturation and spawning of the black lip pearl oyster Pinctada margaritifera, during a 4 months survey conducted in Ahe atoll lagoon. Plankton concentration was assessed by chlorophyll a extraction and by microscope counts while gonadic index, gonado-visceral dry weights and histology were used to measure pearl oysters reproduction activity. We found that (i) plankton concentration fluctuations were mainly related to wind regime, (ii) gametogenesis rate was mainly related to plankton concentration, (iii) spawning occurred when maximal gonad storage was reached, (iv) plankton concentration was the main spawning synchronizing factor. These results contribute explaining P. margaritifera spat collection variability in French Polynesian atoll lagoon.
珍珠养殖业是法属波利尼西亚的主要产业之一。然而，它仍然完全依赖于不可预测的育珠成功。我们的目的是评估在阿赫环礁泻湖进行的为期 4 个月的调查中，浮游生物浓度的自然波动对黑唇珍珠贝 Pinctada margaritifera 成熟和产卵的影响。通过叶绿素 a 提取和显微镜计数来评估浮游生物浓度，而性腺指数、性腺内脏干重和组织学用于测量珍珠贝的繁殖活动。我们发现：（i）浮游生物浓度的波动主要与风况有关；（ii）配子发生速度主要与浮游生物浓度有关；（iii）当达到最大性腺储存量时发生产卵；（iv）浮游生物浓度是主要的产卵同步因素。这些结果有助于解释法属波利尼西亚环礁泻湖中 P. margaritifera 幼体采集的可变性。
