Quality Trait Signature at Archipelago Scale of the Cultured Pearls Produced by the Black-Lipped Pearl Oyster (Pinctada margaritifera Var. cumingi) in French Polynesia

Type Article
Date 2016-12
Language English
Author(s) Ky Chin-Long1, Okura Retsu2, Nakasai Seiji3, Devaux Dominique2, 3
Affiliation(s) 1 : IFREMER, UMR 241, EIO, Labex Corail,Ctr Pacifique, BP 7004, F-98719 Tahiti, Polynesie Franc, France.
2 : Grp Interet Econ Poe O Rikitea, BP 176, F-98755 Gambier, Polynesie Franc, France.
3 : SCA Regahiga Pearls, BP 48, F-98755 Gambier, Polynesie Franc, France.
Source Journal Of Shellfish Research (0730-8000) (Natl Shellfisheries Assoc), 2016-12 , Vol. 35 , N. 4 , P. 827-835
DOI 10.2983/035.035.0410
WOS© Times Cited 10
Keyword(s) pearl oyster, Pinctada margaritifera, large-scale geographic effects, pearl color, pearl grade, pearl shape, pearl size
Abstract In French Polynesia, the aquaculture of Pinctada margaritifera (Linnaeus, 1758) covers a large maritime exploitation area, spread over nearly 20 degrees latitude and longitude, with numerous pearl farms located in three archipelagos (Gambier, Society, and Tuamotu). As these archipelagos have specific seasonal temperature patterns each year, pearl oysters are subject to disparate and contrasting environmental regimes. This study aimed to examine the specificity of commercial pearl quality traits (n ¼ 2,236 samples) at the archipelago scale, in such a way as to provide preliminary data to design the most appropriate strategy for the distribution of hatchery-produced phenotypes. A large and standardized grafting experiment using the same donor phenotype was designed and carried out over six grow-out locations, covering the three archipelagos. Results revealed significant differences in commercial pearl quality traits among archipelagos, giving these groups of growing sites distinctive ‘‘signatures’’: (1) more color, less circles, and higher overall pearl grade in Gambier; (2) larger size with paler pearls in Tuamotu; and (3) darker pearls with intermediate size in Society. Characteristic differences in the environment and seasonal temperature ranges among the three archipelagos, corresponding to their distinct environmental conditions, can explain the specific variations between pearl quality traits among the sites. The strong disparities at archipelago scale should be taken into account in selective breeding programs for P. margaritifera so as to choose the most appropriate pearl oyster donor phenotype for use in each environment and thus enhance site-specific qualities for pearl production.
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Ky Chin-Long, Okura Retsu, Nakasai Seiji, Devaux Dominique (2016). Quality Trait Signature at Archipelago Scale of the Cultured Pearls Produced by the Black-Lipped Pearl Oyster (Pinctada margaritifera Var. cumingi) in French Polynesia. Journal Of Shellfish Research, 35(4), 827-835. Publisher's official version : https://doi.org/10.2983/035.035.0410 , Open Access version : https://archimer.ifremer.fr/doc/00357/46798/