Consulta: creatorFacets:"Nakasai, Seiji"
Registros recuperados: 6
Data/hora: 11/06/2024 11:42:27

Potential combinations of mabé, keshi and cultured pearl production from colourful hatchery-produced Pinctada margaritifera
Provedor de dados: 5
Autores: 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

Influence of grafter skill and season on cultured pearl shape, circles and rejects in Pinctada margaritifera aquaculture in Mangareva lagoon
Provedor de dados: 5
Autores: Ky, Chin-long; Nakasai, Seiji; Molinari, Nicolas; Devaux, Dominique.
Cultured pearls quality produced by the mollusc Pinctada margaritifera var. cumingi is determined by a panel of criteria, of which shape is one of the most relevant. Cultured pearls with round and semi-round (RS) shapes are the most valuable. Decreasing the proportion of other pearl shapes (OT: baroque, button, drop, oval), and especially the circled pearls (CL) and rejects (rebuts: RT), is an important challenge for the pearl industry. The present study examined the effect of grafter skill and season of graft on the variation in proportions of CL, RS, OT and RT cultured pearl shape categories in a mono-site culture (Mangareva island lagoon). Six large-scale grafting experiments, carried out in the same way as commercial grafting sessions, were made by...
Tipo: Text
Palavras-chave: Pinctada margaritifera; Cultured pearl; Grafter skill; Pearl shapes; Circled pearls; Grafting season.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00216/32745/31150.pdf

Is pearl colour produced from Pinctada margaritifera predictable through shell phenotypes and rearing environments selections?
Provedor de dados: 5
Autores: Ky, Chin-long; Le Pabic, Lore; Koua, Manaarii Sham; Molinari, Nicolas; Nakasai, Seiji; Devaux, Dominique.
The black-lipped pearl oyster, Pinctada margaritifera is the most important farmed mollusc species in French Polynesia. Donor oyster selection among wild P. margaritifera individuals, chosen according to their inner shell colour, makes it possible to obtain the broadest range of cultured pearl colours of any species. This study demonstrates the relative influence of using black [B] or red [R] outer shell phenotypes, combined with green [G] or yellow [Y] inner shell phenotypes, on pearl darkness level, colour categories and lustre. A large scale grafting experiment was designed and carried out over five grow-out locations, covering three archipelagos: Tuamotus, Society and Gambier. Results revealed that the [B + G] phenotypes may be used as donors to...
Tipo: Text
Palavras-chave: Pearl oyster; Pinctada margaritifera; Shell colour phenotype; Pearl colour; Environment.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00285/39637/38129.pdf

Variation in cultured pearl quality traits in relation to position of saibo cutting on the mantle of black-lipped pearl oyster Pinctada margaritifera
Provedor de dados: 5
Autores: Ky, Chin-long; Nakasai, Seiji; Parrad, Sophie; Broustal, Floriane; Devaux, Dominique; Louis, Patricia.
Cultured pearl production from Pinctada margaritifera uses the biomineralization capacities of the mantle graft, the saibo, which is usually obtained from only the middle mantle section of the donor oyster. To evaluate the potential for using other parts of the mantle, this study explores and describes the cultured pearl quality traits, pearl size, shape, surface defects and colour parameters obtained with saibo from the entire length of the mantle, comprising the four following sections: 1) posterior, 2) connection with the gills, 3) middle, (the section usually used commercially), and 4) anterior. Rates of nucleus retention and oyster mortality were also recorded and compared between sections. For this, two experimental grafts were designed and conducted...
Tipo: Text
Palavras-chave: Pinctada margaritifera; Pearl oyster; Pearl quality traits; Saibo position; Mantle tissue; Phenotype.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00439/55030/56461.pdf

Quality Trait Signature at Archipelago Scale of the Cultured Pearls Produced by the Black-Lipped Pearl Oyster (Pinctada margaritifera Var. cumingi) in French Polynesia
Provedor de dados: 5
Autores: Ky, Chin-long; Okura, Retsu; Nakasai, Seiji; Devaux, Dominique.
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...
Tipo: Text
Palavras-chave: Pearl oyster; Pinctada margaritifera; Large-scale geographic effects; Pearl color; Pearl grade; Pearl shape; Pearl size.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00357/46798/46665.pdf

Culture site dependence on pearl size realization in Pinctada margaritifera in relation to recipient oyster growth and mantle graft biomineralization gene expression using the same donor phenotype
Provedor de dados: 5
Autores: Le Pabic, Lore; Parrad, Sophie; Sham Koua, Manaarii; Nakasai, Seiji; Saulnier, Denis; Devaux, Dominique; Ky, Chin-long.
Size is the most important and valuable quality of the cultured black-lip pearl, Pinctada margaritifera. As this pearl aquaculture is carried out at numerous grow-out sites, this study analyzes the environmental influence on pearl size parameters (nacre weight and thickness) in relation to the recipient oyster biometric parameters (shell thickness, height, width, and oyster weight) at harvest time. Toward this end, an experimental graft was designed by using a homogeneous donor oyster phenotype. The recipient oysters were randomly and equally transferred and reared in five commercial and contrasting grow-out locations. Overall inter-site comparisons revealed that the cultured pearl size (N=2168) and the biometric parameters of the recipient oysters were...
Tipo: Text
Palavras-chave: Pinctada margaritifera; Cultured pearl size; Donor oysters; Recipient oysters; Gene expression; Environmental influences.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00321/43191/42738.pdf