Indeed the success of this activity remained highly variable in space and time (Andréfouët et al. 2006). After the PGRN, researches were not anymore necessarily coordinated within a single program. Instead, the Service de la Perliculture (Pearl Aquaculture Service) managed since PCI-32765 mw 2002 individual actions with the various research organisms involved in the activities. Numerous programs were launched in the past five years, using a variety of source of funding. In 2008 and 2009, the PERDUR project aimed

for a better resource sustainability and farmers profits (Hui et al., 2011, Thomas et al., 2011a and Yaroshewski, 2011). The ADEQUA research consortium was launched in 2008 to coordinate during 4 years the activities related to the understanding of the quality of the pearl (e.g., Joubert et al., 2010, Linard et al., 2011 and Montagnani et al., 2011). Meantime,

the project REGENPERL specifically looked at physiologic (Le Moullac et al., 2011) and genetic aspects (Lemer and Planes, 2012) and a network dedicated to the monitoring of sanitary conditions was developed. Larval dispersal in Ahe atoll was studied, and the larval ecology of P. margaritifera was characterized leading to the development of a bioenergetic growth model ( Thomas et al., 2011b). Finally, late 2007, a European Community funded project was launched under the auspices of the Service de la Perliculture to investigate in Ahe Atoll HDAC inhibitor and Takaroa Atoll the trophic regime of oysters and the hydrodynamic forcing on spat collection. The compilation of papers published in this special issue and summarized below present the main finding of this project for Ahe Atoll. Ahe Atoll was selected by a European Fund for Development project for its major position in the hierarchy of pearl and spat producers. Ahe atoll is located in the North-western part of the Tuamotu Archipelago, 500 km North-East of Tahiti. Its lagoon covers 145 km2 with a mean depth to close to 40 m and a maximum depth of around 70 m. One active pass is located in the

western part of the lagoon and several reef-flat spillways (hoa, less than 50 cm depth) are distributed along the reef rim, mainly in the south and west part sectors (Dumas et al., 2012). The overall aperture is low, and Ahe can be defined as a semi-closed atoll. In May 2012, 77 farms were registered. They covered 1188 hectares of lagoonal space (Fig. 1). In December 2007, these numbers were respectively 83 farms and 1320 hectares, illustrating the continuous decrease of the activity. The number of authorized collecting stations was 1050 in May 2012, each about 200 m long. The total number of cultivated oysters could represent up to 15 millions oysters. The bulk of the Ahe project was accomplished between 2008 and 2010, with field work occurring from mid-2008 to end of 2009. Three different activities took place.