Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 15
Primeira ... 1 ... Última
Imagem não selecionada

Imprime registro no formato completo
Calcein staining of calcified structures in pearl oyster Pinctada margaritifera and the effect of food resource level on shell growth ArchiMer
Linard, Clementine; Gueguen, Yannick; Moriceau, Jacques; Soyez, Claude; Hui, Belinda; Raoux, Aurore; Cuif, Jean Pierre; Cochard, Jean-claude; Le Pennec, Marcel; Le Moullac, Gilles.
Marine mollusc shell growth has been widely measured using fluorochrome marking. In order to test the efficiency and reliability of calcein staining on P. margaritifera shells and pearls, the present study examined two administration methods, different concentrations and several immersion times.Immersion in a 150 mg.L-1 calcein solution for 12 h to 24 h appeared to be the best method for marking P. margaritifera shells. For pearl marking, injection of a 200 mg.L-1 calcein solution into the pearl pouch was the optimal method. Calcein marking was then used to measure the influence of food resource levels on the shell growth. Groups of 23-month-old P. margaritifera were fed at three trophic levels for two months. The two highest food levels tested (6 000...
Tipo: Text Palavras-chave: Bivalvia; Pearl; Shell; Growth; Scanning electron microscope.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00028/13907/11195.pdf
Imagem não selecionada

Imprime registro no formato completo
Conditionnement de l’huître perlière Pinctada margaritifera en laboratoire : première approche descriptive de la croissance en bassins contrôlés ArchiMer
Le Moullac, Gilles; Goraguer, Herle; Maihota, Mayalen; Teissier, Hinano; Tiapari, Jerome; Bennett, Auguste; Soyez, Claude.
Dans le cadre du programme Reproduction de l’huître perlière Pinctada margaritifera, dont l’objectif est la maîtrise des croisements, le conditionnement en laboratoire des reproducteurs est une étape nécessaire pour espérer contrôler et synchroniser la maturation de ces reproducteurs. Les facteurs présumés qui permettront de contrôler la maturation sont d’ordre environnemental : l’alimentation et la température. Cependant avant d’espérer établir la relation entre la fonction physiologique et les facteurs qui contrôlent cette fonction, il est indispensable de mettre en œuvre une zootechnie adaptée aux besoins vitaux de façon à assurer la survie et une bonne croissance. Cette étude a pour objectif de tester la survie et la croissance des huîtres perlières...
Tipo: Text
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00182/29288/27729.pdf
Imagem não selecionada

Imprime registro no formato completo
Determination of gender in the pearl oyster pinctada margaritifera ArchiMer
Chavez-villalba, Jorge; Soyez, Claude; Huvet, Arnaud; Gueguen, Yannick; Lo, Cedrik; Le Moullac, Gilles.
The pearl industry in French Polynesia is based on exploitation of natural stocks of the black-lip pearl oyster (Pinctada margaritifera); it generates an annual turnover of 90 million euros. Improvements in pearl quality need genetic studies to improve the populations. This pearl oyster is a protandric species, where the sex-ratio normally is biased towards males. There is an increasing interest in gender control to find the mechanisms to augment female proportions for management purposes. This review summarizes information on exogenous and endogenous factors regulating gender in this and other bivalves and concludes that P. margaritifera is a protandric hermaphrodite, developing as a male during the first two years and without evidence of an effect from...
Tipo: Text Palavras-chave: Pearl oyster; Pinctada; Hermaphrodite; Temperature; Food; Stress; Sex genes; Sex steroids.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00040/15100/12543.pdf
Imagem não selecionada

Imprime registro no formato completo
Evaluation des conséquences d'une situation hypoxique simulée sur la Capacité Osmorégulatrice des crevettes d'élevage, Penaeus stylirostris et Penaeus vannamei ArchiMer
Soyez, Claude.
Les résultats exposés dans ce rapport apportent des informations sur la Capacité Osmorégulatrice des crevettes d'élevage, Penaeus stylirostris et P. vannamei, face à un abaissement de l'oxygénation ambiante. Ces résultats s'appliquent à des juvéniles placés dans des conditions optimum en laboratoire mais à niveau métabolique bas : animaux à jeun, en stade d' intermue C, adaptés après dissipation du stress induit par la pêche et le transfert dans un nouvel environnement. Les mesures ont confirmé que les crevettes présentent une zone d'indépendance osmorégulatrice au-dessus de 3 mg O2.11 et· une zone de dépendance osmorégulatrice qui commence au-dessous de cette valeur. Ces résultats vont également dans le sens de ceux obtenus sur les tests de croissance et...
Tipo: Text Palavras-chave: Aquaculture tropicale; Pénéides; Respiration; Hypoxie; Stress; Osmorégulatio; Adaptation.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/00425/53682/54526.pdf
Imagem não selecionada

Imprime registro no formato completo
Expériences préliminaires sur le conditionnement de géniteurs d'huÎtres perlières, Pincfada margarififera. Rapport final de la Convention N° 40440 Service de la Perliculture - Ifremer ArchiMer
Soyez, Claude; Tiapari, Jerome; Teissier, Hinano; Cochard, Jean-claude.
En Polynésie française, la perliculture s'est développée à partir de naissain de captage. Les transferts de juvéniles entre les îles ont conduit à une certaine uniformisation des populations mais l'huître perlière reste essentiellement un animal sauvage (Arnaud et al. ,2003). Une des voies d'amélioration de la qualité des perles et de la rentabilité de la perliculture repose sur la sélection d'individus intéressants et/ou plus performants en particulier comme donneurs de greffons (couleur). L'étape qui consiste à multiplier les animaux sélectionnés passe nécessairement par le contrôle de la reproduction. Les travaux menés dans le cadre de précédentes conventions sur la triploïdisation, la cryoconservation et la maturation ovocytaire (Te Reko Parau N°16 et...
Tipo: Text
Ano: 2005 URL: http://archimer.ifremer.fr/doc/00304/41517/40725.pdf
Imagem não selecionada

Imprime registro no formato completo
Feeding the pearl oyster Pinctada margaritifera during reproductive conditioning ArchiMer
Le Moullac, Gilles; Soyez, Claude; Sham-koua, Manaarii; Levy, Peva; Moriceau, Jacques; Vonau, Vincent; Maihota, Mayalen; Cochard, Jean-claude.
This study aimed to model the food intake of P. margaritifera in order to examine the relationship between food level and reproductive activity. The effect of microalgae concentration on ingestion rate and assimilation efficiency was studied over a broad concentration range, using a mixture of Isochrysis galbana and Chaetoceros gracilis. Reproductive effort was assessed using three microalgae concentrations of 0.5, 7 and 18 cell μL-1. Reproductive status was assessed by gonad development index (GDI) – the ratio of the gonad surface to the visceral mass surface – and histological analysis of the gonad based on the presence (continuous or discontinuous) or the absence of gonial cells (GC). Ingestion is a saturating function of seston concentration for...
Tipo: Text Palavras-chave: Pinctada margaritifera; Food level; Ingestion rate; Reproduction; Gametogenesis.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00050/16085/13562.pdf
Imagem não selecionada

Imprime registro no formato completo
Impact of pCO2 on the energy, reproduction and growth of the shell of the pearl oyster Pinctada margaritifera ArchiMer
Le Moullac, Gilles; Soyez, Claude; Vidal-dupiol, Jeremie; Belliard, Corinne; Fievet, Julie; Sham-koua, Manaarii; Lo-yat, Alain; Saulnier, Denis; Gaertner-mazouni, N.; Gueguen, Yannick.
The possible consequences of acidification on pearl farming are disruption of oyster metabolism and change in growth. In the laboratory, we studied the impact of pCO2 (3540, 1338 and 541μatm) on the physiology of pearl oysters exposed for 100 days. This experiment was repeated after an interval of one year. Several physiological compartments were examined in pearl oysters: the scope for growth by measuring ingestion, assimilation and oxygen consumption, gametogenesis by means of histological observations, shell growth by measurement and observation by optical and electronic microscopy, and at molecular level by measuring the expression of nine genes of mantle cells implied in the biomineralisation process. Results from both experiments showed that high...
Tipo: Text Palavras-chave: Global change; Pearl oyster; Bioenergetic; Biomineralization; Pacific Ocean; French Polynesia.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00321/43189/42737.pdf
Imagem não selecionada

Imprime registro no formato completo
Influence of Temperature and Pearl Rotation on Biomineralization in the Pearl Oyster Pinctada margaritifera ArchiMer
Le Moullac, Gilles; Schuck, Lucie; Chabrier, Sebastien; Belliard, Corinne; Lyonnard, Pierre; Broustal, Floriane; Soyez, Claude; Saulnier, Denis; Brahmi, Chloe; Ky, Chin-long; Beliaeff, Benoit.
The objective of this study was to observe the impact of temperature on pearl formation using  an integrative approach describing the rotation of the pearls, the rate of nacre deposition, the  thickness of the aragonite tablets and the biomineralizing potential of the pearl sac tissue  though the expression level of some key genes. Fifty pearl oysters were grafted with  magnetized nuclei to allow the rotation of the pearls to be described. Four months later, 32 of  these pearl oysters were exposed to four temperatures (22, 26, 30 and 34°C) for 2 weeks.  Results showed that the rotation speed differed according to the movement direction: pearls  with axial movement (AM) had a significantly higher rotation speed than those with random  movement (RM). Pearl...
Tipo: Text Palavras-chave: Magnetometer; Rotation speed; Nacre growth; Nacre thickness; Gene expression; Pmarg-Pif177.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00450/56196/57753.pdf
Imagem não selecionada

Imprime registro no formato completo
Low energy cost for cultured pearl formation in grafted chimeric Pinctada margaritifera ArchiMer
Le Moullac, Gilles; Soyez, Claude; Ky, Chin-long.
The pearl oyster is one of the rare animal models that support two distinct genomes,  through the surgical graft process operated for culture pearl production. This grafted  organism is assimilated to a chimera whose physiological functioning remains poorly known.  The question of the energy expenditure comparison between chimera and non-chimera  animals arises. To answer this question, grafted and non-grafted pearl oysters were  evaluated for their energetic needs by the indirect calorimetry method. This method made it  possible to measure the energy expenditure based on the respiration rate (RR)  measurement, reflecting the basal metabolism. The results showed that the RR values for  grafted and non-grafted pearl oysters were not significantly different...
Tipo: Text
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00437/54861/56350.pdf
Imagem não selecionada

Imprime registro no formato completo
Microplastics Affect Energy Balance and Gametogenesis in the Pearl Oyster Pinctada margaritifera ArchiMer
Gardon, Tony; Reisser, Celine; Soyez, Claude; Quillien, Virgile; Le Moullac, Gilles.
Plastic pollution in the environment is increasing at global scale. Microplastics (MP) are derived from degradation of larger plastic items or directly produced in microparticles form (<5 mm). Plastics, widely used in structures and equipments of pearl farming, are a source of pollution to the detriment of the lagoon ecosystem. In order to evaluate the impact of MP on the physiology of Pinctada margaritifera, a species of ecological and commercial interests, adult oysters were exposed to polystyrene microbeads (micro-PS of 6 and 10 μm) for 2 months. Three concentrations were tested: 0.25, 2.5, 25 μg L-1 and a control. Ingestion and respiration rate and assimilation efficiency were monitored on a metabolic measurement system to determine the individual...
Tipo: Text
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00435/54684/56104.pdf
Imagem não selecionada

Imprime registro no formato completo
Phenome of pearl quality traits in the mollusc transplant model Pinctada margaritifera ArchiMer
Ky, Chin-long; Quillien, Virgile; Broustal, Floriane; Soyez, Claude; Devaux, Dominique.
The bivalve Pinctada margaritifera exhibits three main transplant phenotypes derived from  the donor (from which a mantle graft tissue, the saibo, is excised), the recipient (into which  the saibo is implanted with a nucleus, leading to the formation of a pearl sac "chimera") and  the cultured pearls themselves. This first phenome study on the species derived from a large  experimental graft. Transplant phenotype was assessed at three scales: 1) macro, pearl size,  colour, grade, 2) micro, pearl surface microstructure, and 3) molecular, biomineralisation  gene expression level in saibo and pearl sac tissues. From donor to pearl, the phenome  revealed fine variations of quality traits dependent on the position on the mantle where the  saibo was cut, whose...
Tipo: Text
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00423/53419/54306.pdf
Imagem não selecionada

Imprime registro no formato completo
Physiological responses of female and male black-lip pearl oysters (Pinctada margaritifera) to different temperatures and concentrations of food ArchiMer
Chavez-villalba, Jorge; Soyez, Claude; Aurentz, Hermann; Le Moullac, Gilles.
This study was designed to measure responses of four-year-old black-lip pearl oysters (Pinctada margaritifera) to different temperatures and food concentrations and to identify the energy requirements of each sex. Oysters were fed a monospecific microalgal diet of Isochrysis affinis galbana (T-iso). Measurements of oxygen consumption and ingestion rates were carried out at 24 degrees C and 27 degrees C and at two algal (T-iso) concentrations: 5000 and 30 000 cell ml(-1). Glycogen content in adductor muscle, absorption efficiency and scope for growth were also estimated. Females and males responded differently to environmental factors, with food level being the most influential parameter. Oxygen consumption and absorption efficiency were significantly...
Tipo: Text Palavras-chave: Food supply; Ingestion rate; Glycogen; Oxygen consumption; Scope for growth; Pearl oyster.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00157/26855/24980.pdf
Imagem não selecionada

Imprime registro no formato completo
Pinctada margaritifera responses to temperature and pH: Acclimation capabilities and physiological limits ArchiMer
Le Moullac, Gilles; Soyez, Claude; Latchere, Oihana; Vidal-dupiol, Jeremie; Fremery, Juliette; Saulnier, Denis; Lo Yat, Alain; Belliard, Corinne; Mazouni-gaertner, Nabila; Gueguen, Yannick.
The pearl culture is one of the most lucrative aquacultures worldwide. In many South Pacific areas, it depends on the exploitation of the pearl oyster Pinctada margaritifera and relies entirely on the environmental conditions encountered in the lagoon. In this context, assessing the impact of climatic stressors, such as global warming and ocean acidification, on the functionality of the resource in terms of renewal and exploitation is fundamental. In this study, we experimentally addressed the impact of temperature (22, 26, 30 and 34 °C) and partial pressure of carbon dioxide pCO2 (294, 763 and 2485 μatm) on the biomineralization and metabolic capabilities of pearl oysters. While the energy metabolism was strongly dependent on temperature, results showed...
Tipo: Text Palavras-chave: Global change; Pearl oyster; Bioenergetic; Biomineralization; Pacific ocean; French Polynesia.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00332/44364/43969.pdf
Imagem não selecionada

Imprime registro no formato completo
Response of the blue shrimp Litopenaeus stylirostris to temperature decrease and hypoxia in relation to molt stage ArchiMer
Mugnier, Chantal; Soyez, Claude.
The effect of different levels of dissolved oxygen (DO) and a decreased temperature combined with severe hypoxia were studied in the blue shrimp Litopenaeus stylirostris in relation to molt stage. In the first experiment, shrimps were submitted to DO concentrations of 5 to 1 mg l(-1). Osmoregulatory capacity (OC) was measured in shrimps at molt stage C after 6, 24, or 48 h of exposure. No mortality was recorded but a significant negative effect of DO concentration on hypo-OC was observed for DO concentrations below 3 mg l(-1). Osmoregulation improved after 48 h exposure, compared to 6 and 24 h exposure. In a second experiment, temperature was decreased from 28 to 22 degreesC in 24 h, before a severe hypoxia of 0.5+/-0.1 mg O-2 l(-1) was applied....
Tipo: Text Palavras-chave: Temperature; Stress; Penaeid shrimp; Osmoregulation; Molt stage; Litopenaeus stylirostris; Hypoxia.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-372.pdf
Imagem não selecionada

Imprime registro no formato completo
Temperature and Food Influence Shell Growth and Mantle Gene Expression of Shell Matrix Proteins in the Pearl Oyster Pinctada margaritifera ArchiMer
Joubert, Caroline; Linard, Clementine; Le Moullac, Gilles; Soyez, Claude; Saulnier, Denis; Teaniniuraitemoana, Vaihiti; Ky, Chin-long; Gueguen, Yannick.
In this study, we analyzed the combined effect of microalgal concentration and temperature on the shell growth of the bivalve Pinctada margaritifera and the molecular mechanisms underlying this biomineralization process. Shell growth was measured after two months of rearing in experimental conditions, using calcein staining of the calcified structures. Molecular mechanisms were studied though the expression of 11 genes encoding proteins implicated in the biomineralization process, which was assessed in the mantle. We showed that shell growth is influenced by both microalgal concentration and temperature, and that these environmental factors also regulate the expression of most of the genes studied. Gene expression measurement of shell matrix protein...
Tipo: Text
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00210/32095/30535.pdf
Registros recuperados: 15
Primeira ... 1 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional