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| Registros recuperados: 60 | |
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| Gueguen, Yannick; Montagnani, Caroline; Joubert, Caroline; Marie, Benjamin; Belliard, Corinne; Tayale, Alexandre; Fievet, Julie; Levy, Peva; Piquemal, David; Marin, Frederic; Le Moullac, Gilles; Ky, Chin-long; Garen, Pierre; Lo, Cedrick; Saulnier, Denis. |
| Tahiti’s pearl farming industry plays a major socio-economic role in French Polynesia. In an increasingly competitive market where the production of high quality pearls becomes essential, research can help secure and ensure sustainable production. In that context, Ifremer, in close collaboration with the “direction des resources marines” (French Polynesian government agency) has developed research projects on the “sustainable development of pearl farming”. This program is organized along 3 axes: (1) understanding the animal physiology and initiating a genetically selective breeding program of donor oysters; (2) understanding pearl oyster larvae dispersal and recruitment; (3) understanding the molecular mechanisms underlying biomineralization processes... |
| Tipo: Text |
Palavras-chave: Pearl oyster; Biomineralization; Pinctada margaritifera. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00167/27840/26049.pdf |
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| Teaniniuraitemoana, Vaihiti; Huvet, Arnaud; Levy, Peva; Klopp, Christophe; Lhuillier, Emeline; Gaertner-mazouni, Nabila; Gueguen, Yannick; Le Moullac, Gilles. |
| Background Black pearl farming is based on culture of the blacklip pearl oyster Pinctada margaritifera (Mollusca, lophotrochozoa), a protandrous hermaphrodite species. At first maturation, all individuals are males. The female sex appears progressively from two years old, which represents a limitation for broodstock conditioning for aquaculture production. In marine mollusks displaying hermaphroditic features, data on sexual determinism and differentiation, including the molecular sex determining cascade, are scarce. To increase genomic resources and identify the molecular mechanisms whereby gene expression may act in the sexual dimorphism of P. margaritifera, we performed gonad transcriptome analysis. Results The gonad transcriptome of P. margaritifera... |
| Tipo: Text |
Palavras-chave: Pinctada margaritifera; Gametogenesis; Transcriptome; Differential expression; Sex determinism. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00201/31194/29593.pdf |
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| Ky, Chin-long; Leclerc, Nicolas; Broustal, Floriane; Nakasai, Seiji; Devaux, Dominique. |
| Aquaculture of nacreous gems, such as cultured pearls, mabé or keshi, is done mostly using different mollusc species grown in countries of the Indo-Pacific region. To date, no single species has been exploited for the simultaneous generation of more than one of these bioproducts, but all require animals with colourful shells. Historically, Pinctada species have mainly been used for nucleated pearl production, selecting the rarer colourful individuals to be used as graft donors. By contrast, colourful Pteria species have mostly been used for mabé production, as the grafting operation for pearl production is associated with low yield. In this study, we report the potential for cumulating cultured pearl and mabé (MP), or keshi and mabé (MK) production, using... |
| Tipo: Text |
Palavras-chave: Pearl oyster; Pinctada margaritifera; Mabe; Keshi; Pearls. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00482/59398/62168.pdf |
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| Tayale, Alexandre; Gueguen, Yannick; Treguier, Cathy; Le Grand, Jacqueline; Cochennec-laureau, Nathalie; Montagnani, Caroline; Ky, Chin-long. |
| Producing high quality cultured black pearls from Pinctada margaritifera is one of the major challenges for the "pearl oyster" industry in French Polynesia. In order to assess donor effect on cultured pearl quality, wild Pinctada margaritifera originating from the Tuamotu Archipelago were used in a duplicated grafting experiment. After 12 months of culture, nucleus retention was assessed and seven pearl quality traits recorded on the 454 cultured pearls harvested from the experiment. The traits scored were nacre thickness and pearl weight, surface defects, lustre, grade, and the colour components: 1) darkness of cultured pearl colour, and 2) visual perception of colour class (bodycolor and/or overtone). Our results demonstrate for the first time that... |
| Tipo: Text |
Palavras-chave: Cultured pearl oyster; Pearl quality; Nacre; Donor mollusc; Genetic selection; Pteriidae; Blacklip pearl oyster; Pinctada margaritifera; French Polynesia. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00116/22757/20541.pdf |
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| Auffret, Pauline; Le Luyer, Jeremy; Sham Koua, Manaarii; Quillien, Virgile; Ky, Chin-long. |
| Background Albino mutations are commonly observed in the animal kingdom, including in bivalves. In the black-lipped pearl oyster Pinctada margaritifera, albino specimens are characterized by total or partial absence of colouration resulting in typical white shell phenotype expression. The relationship of shell colour with resulting cultured pearl colour is of great economic interest in P. margaritifera, on which a pearl industry is based. Hence, the albino phenotype provides a useful way to examine the molecular mechanisms underlying pigmentation. Results Whole transcriptome RNA-sequencing analysis comparing albino and black wild-type phenotypes at three stages over the culture cycle of P. margaritifera revealed a total of 1606, 798 and 187 differentially... |
| Tipo: Text |
Palavras-chave: Pinctada margaritifera; Albinism; Pigmentation; RNA-seq; Notch signaling pathway; Tyrosinase; Biomineralization. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00652/76420/77477.pdf |
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| Ky, Chin-long; Demmer, Jonathan; Sham-koua, Manaarii; Cabral, Philippe. |
| Production of larger, rounder, high-quality cultured pearls with fewer circles is one of the main challenges of Pinctada margaritifera aquaculture faced by every pearl farm in French Polynesia. Although bigger pearl sizes can be achieved through surgreffe operations (implantation of a second nucleus following pearl harvest), control of the development of pearl circles and shapes still remains unclear, as illustrated by grafter’s empirical rules, where often the surgreffe process is only performed after production of uncircled and round pearl shapes. The present study was designed with a real pearl by pearl traceability to reveal for the first time the development of circles and shapes from graft and surgreffe, in relation to the size of the pearl sac. This... |
| Tipo: Text |
Palavras-chave: Pearl oyster; Pinctada margaritifera; Surgreffe; Circled pearls; Pearl shapes; Pearl sac. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00276/38690/37187.pdf |
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| Ky, Chin-long; Sham Koua, Manaarii; Le Moullac, Gilles. |
| Beaded cultured pearl farming is a lengthy aquaculture process, particularly when the pearl oysters are produced through a hatchery propagation system, and includes the key steps of artificial breeding, larval and spat rearing before graft operations can take place. Within its genus, Pinctada margaritifera has the ability to produce the widest range of pearl colours, thanks to the donor colour polymorphism of the inner shell, which is mainly responsible for colour transmission. As hatchery spat production in P. margaritifera leads to several colour phenotypes (at 3 months old), the aim of this study was to determine whether a relation exists between the colour of the donors as spat and the final pearl colour. In the experiment, which took place over a... |
| Tipo: Text |
Palavras-chave: Pinctada margaritifera; Phenotypes; Spat shell colour; Earlier selection; Pearl colour. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00418/52969/53895.pdf |
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| Cochennec, Nathalie; Haffner, Philippe; Levy, Peva; Saulnier, Denis; Fougerouse, A.; Langy, Sandra. |
| In French Polynesia, black pearl cultivation now takes place on about 30 of the 118 atolls or islands. This activity has largely replaced copra, coconut oil and fishing as a source of income. Around 1,000 pearl farms, generally small ones of less than 5 ha, are registered. The pearl farms are mainly owned by families. In 1998, about 7,000 persons were employed in theentire pearl industry, from production to retailing. In value, this activity represents the first exportation of French Polynesian products. From 1988 to date, exports increased exponentially before leveling. Starting with less than two kilograms in 1972, exports have now stabilized at Il tons of "black" pearls. |
| Tipo: Text |
Palavras-chave: Vibrio; Microbiology; Grafting process; Pinctada margaritifera. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-4928.PDF |
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| Cabral, P. |
| The black-lip pearl oyster Pinctada margaritifera lives and reproduces with high performance in most of Tuamotu Lagoons. Technics to collect spats, to culture juveniles and to operate oysters were quickly found and applicated. Nevertheless, the sudden rise of this activity has been correlated with an anarchic development. For instance, large occupation of areas in the lagoons, cultivation of numerous oysters in confined areas, lack of knowledge on the basis culture technics in many farms. In 1985, mass mortalities have appeared in some lagoons and 50 to 80% of cultured stock died. Some investigations have been done but no explanation was found. In 1988, the mortalities are still very high. An analysis of cooperative production results from 1979 to 1988... |
| Tipo: Text |
Palavras-chave: Pinctada margaritifera; Bivalvia; Spat; Juveniles; Oyster culture; Reproduction; Pearl culture; Pearl oysters; Mortality. |
| Ano: 1989 |
URL: http://archimer.ifremer.fr/doc/1989/acte-1484.pdf |
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| Comps, Marie-annick; Herbaut, Christian; Fougerouse, Angélique. |
| Whitish parasite-like bodies (PLBs), 0.5-2 mu m in size, were detected within the pearl bag of some grafted pearl oysters, Pinctada margaritifera, from Takapoto island (French Polynesia). Histological and ultrastructural investigations have revealed that these bodies consisted of lamellar organic material locally secreted by some epithelial cells of the pearl bag. The fine structure and the formation of these bodies are described. The causes of this abnormal secretion of organic mater, which actually corresponds to periostracum, are not presently known. No parasite nor infectious micro-organism was found associated with the PLBs. |
| Tipo: Text |
Palavras-chave: Periostracum; Pearl bag; Pinctada margaritifera. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/2000/publication-545.pdf |
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| Ky, Chin-long; Lau, Christophe; Sham Koua, Manaarii; Lo, Cedrik. |
| The black-lipped pearl oyster Pinctada margaritifera is of high economic importance in French Polynesia. Arecent decline in pearl value led to the initiation of several genetic breeding programs aiming to improve production traits, including oyster shell growth, which dictates the time of grafting, size of the implanted nuclei, and biomineralization capacities. We assessed shell diameters on hatchery-produced spat to analyze juvenile growth performance of four half-sib families derived from polyandry (one dam crossed with two sires) and polygyny (two dams crossed with one sire) using gametes obtained by thermal shock or gonad scarification. Spat growth was monitored over 3 mo, with shell diameter measured weekly. Results revealed that the spawning method... |
| Tipo: Text |
Palavras-chave: Pearl oysters; Pinctada margaritifera; Juvenile; Growth performance; Spawning procedure. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00310/42167/41470.pdf |
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| Arnaud, Sophie; Goyard, Emmanuel; Prou, Jean; Vonau, Vincent; Bonhomme, Francois; Boudry, Pierre. |
| Exploitation of the pearl oyster Pinetada margaritifera, which has developed in French Polynesia over the last twenty years, is based mainly on the collection of natural spat. Recruitment is highly variable in space and time and so spat is very often transferred by the farmers between atolls or even between archipelagos. In previous studies, anonymous nuclear markers demonstrated that This development has coincided with a genetic homogenisation of the wild stocks since the 1980s. This suggests a high level of reproductive success on farms, which is likely to be due to the high density of animaIs when compared to the density in the wild. We used the same markers to show that the level of genetic variability observed on farms is not significantly different... |
| Tipo: Text |
Palavras-chave: French Polynesia; Genetic diversity; Spat; Pinctada margaritifera; Pearl oyster; Polynésie française; Diversité génétique; Naissain; Pinctada margaritifera; Huître perlière. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/publication-3822.PDF |
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| Sangare, Nathanael; Lo-yat, Alain; Le Moullac, Gilles; Pecquerie, Laure; Thomas, Yoann; Beliaeff, Benoit; Andrefouet, Serge. |
| In French Polynesia black pearl farming represents one of the dominant business sectors. However, it still entirely relies on unpredictable Pinctada margaritifera spat collection success, which is itself conditioned by larval development completion. To assess the relationship between larval development and recruitment success, we studied under controlled conditions the effect of food concentration on development, growth, ingestion rate, survival and metabolic rate at the larval stage. Larvae were exposed to four different phytoplankton densities (2,5; 7,5; 15 and 30 cell.μL−1). Larvae survived equally all over the range of phytoplankton concentration with an average survival rate of 16% at the end of experiments. Food concentration significantly affected... |
| Tipo: Text |
Palavras-chave: Bivalve larvae; Pinctada margaritifera; Physiology; Energetics; Dynamic energy budget theory; Pearl farming; Aquaculture. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00476/58795/61446.pdf |
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| Ky, Chin-long; Broustal, Floriane; Potin, Dan; Lo, Cedrik. |
| In French Polynesia, the P. margaritifera pearl aquaculture industry is spread over a vast area, as large as Europe. All the oysters for this the highly economically important activity are supplied from just a few collection lagoons, but they are grown in numerous sites across three archipelagos (Gambier, Society and Tuamotu). Many oyster transfers thus indirectly bring about grafting combinations mixing different geographic origins and production sites. This study aims to examine the impact of such graft combinations on cultured pearl quality traits. For this, six homogeneous and standardised experimental graft combinations (N = 6197) were conducted at commercial scale in the two growing locations the most frequently used in French Polynesia: Arutua atoll... |
| Tipo: Text |
Palavras-chave: Pearl oyster; Pinctada margaritifera; Graft combinations; Pearl quality traits; Environment. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00477/58888/61444.pdf |
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| Registros recuperados: 60 | |
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