Consulta: subjectFacets:"Pearl oysters"
Registros recuperados: 8
Data/hora: 10/06/2024 18:46:01

Problems and perspectives of the pearl oyster aquaculture in French Polynesia.
Provedor de dados: 5
Autores: Cabral, P.
The first attempt to obtain artificial pearls from the black-lip pearl oyster Pinctada margaritifera in French Polynesia dates back to 1963. The pearl oyster culture has grown quickly especially since the eighties. This industry is now the first exportation in value of French Polynesia. 19 atolls of the Tuamotus island have at this time one or more farms and this activity has more and more attractiveness. The rise of this industry has consequently a lot of socio-ecomic repercussions on these atolls. However, as a young industry, the technics and the development are not always controlled and a lot of problems appeared these last years.
Tipo: Text
Palavras-chave: French Polynesia; Pinctada margaritifera; Trade; Economic analysis; Harvesting; Hatcheries; Spat; Lagoons; Mortality; Oyster culture; Pearl oysters.
Ano: 1989
URL: http://archimer.ifremer.fr/doc/1989/acte-1494.pdf

Some aspects of the abnormal mortalities of the pearl oysters, Pinctada margaritifera in the Tuamotu Archipelago, (French Polynesia)
Provedor de dados: 5
Autores: 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

Growth Performance Comparison of Pinctada margaritifera Juveniles Produced by Thermal Shock or Gonad Scarification Spawning Procedures
Provedor de dados: 5
Autores: 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

Heterotrophic protists as a trophic link between picocyanobacteria and the pearl oyster Pinctada margaritifera in the Takapoto lagoon (Tuamotu Archipelago, French Polynesia)
Provedor de dados: 5
Autores: Loret, Pascale; Le Gall, Solange; Dupuy, Christine; Blanchot, Jean; Pastoureaud, Annie; Delesalle, Bruno; Caisey, Xavier; Jonquieres, Gerard.
Pearl oysters are farmed in oligotrophic tropical atoll lagoons where planktonic communities are dominated by production from cyanobacteria smaller than 2 pm. Paradoxically, the pearl oyster Pinctada margaritifera only retains particles larger than 2 Pm. In this study, we assess the relative contribution of hetero/mixotrophic microbiota to the available planktonic resource. In Takapoto Atoll, picocyanobacteria are the dominant biomass (20 mug C l(-1)). The carbon biomass of ciliates and dinoflagellates ranges from 1 to 24 and 0.5 to 5 mug C l(-1) respectively, with a mean of 6 mug C l(-1) for ciliates and 2 mug C l(-1) for dinoflagellates. The possible retention by P. margaritifera on a natural protist suspension was investigated. Due to its high clearance...
Tipo: Text
Palavras-chave: Trophic resource; Picoplankton; Pinctada margaritifera; Pearl oysters; Atoll lagoon; Protists.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/publication-823.pdf

Influence of farmed pearl oysters and associated biofouling communities on nutrient regeneration in lagoons of French Polynesia
Provedor de dados: 5
Autores: Lacoste, Elise; Gueguen, Yannick; Le Moullac, Gilles; Koua, Manaarii Sham; Gaertner-mazouni, Nabila.
Bivalve cultivation can significantly contribute to nutrient cycling in semi-enclosed ecosystems. We investigated the influence of suspended pearl oyster culture on nutrient regeneration in the water column of 3 oligotrophic lagoons in French Polynesia. The aim of this first study performed in a tropical area was to assess the seasonal variability of nutrient fluxes and to quantify the contribution of biofouling communities. In situ metabolic enclosure systems were used to measure nutrient uptake or release by ‘cultivation units’ (i.e. 4 pearl oysters with or without associated biofouling). In all 3 study lagoons (Tahiti, Mangareva, Ahe), nutrient fluxes produced by pearl oyster and associated biofouling communities (CR units) were 4- to 6-fold higher than...
Tipo: Text
Palavras-chave: Pearl oysters; Biofouling; Nutrient flux; Aquaculture impact.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00201/31193/29592.pdf

Etude comparative des caractères biométriques chez l'huitre perlière "Pinctada radiata" des iles de Kerkennah (sud tunisien)
Provedor de dados: 20
Autores: Derbali, A.; Jarboui, O.; Ghorbel, M.
Le présent travail porte sur l’étude des caractères biométriques de l’huître perlière Pinctada radiata des îles de Kerkennah pour la différenciation entre les populations des deux sites El Kraten et El Jorf à partir d’un pouvoir discriminant des caractères métriques et méristiques. Durant l’année 2007, un total de 2360 et 2422 individus ont été collectés respectivement dans les sites d’El Kraten et d’El Jorf. Les résultats des comparaisons des moyennes et des variances des caractères biométriques à l’aide du test "F" de Fisher et du test "t" de Student plaident en faveur d’une discrimination entre les deux populations. De même, les résultats des analyses multivariées (l’Analyse en Composante Principale (ACP) et l’Analyse Factorielle Discriminante (AFD))...
Tipo: Journal Contribution
Palavras-chave: Pearl oysters; Biometrics.
Ano: 2012
URL: http://hdl.handle.net/1834/5294

Effect of Fouling on Feeding, Oxygen Consumption and Waste Excretion of Pearl Oyster Pinctada martensii in Daya Bay Cultivation.
Provedor de dados: 20
Autores: Su, Zhenxia; Yan, Yan; Huang, Liangmin.
Biofouling is a particular problem in the pearl oyster culture. It may reduce the growth and survival rates of the cultured species. Foulers are often themselves filter feeders, and are therefore potential competitors for food resource with the cultured species. Fouling organisms may also reduce the oxygen supply. A study was conducted to measure the impact of foulers on feeding, oxygen consumption, and waste excretion. POM, ammonia, phosphate and oxygen concentration were measured in various treatments (cultured species，foulers). This study showed that fouling organisms had significant effect on food uptake, oxygen consumption and waste excretion. The clearance rate, ammonia and phosphate release rate, oxygen consumption rate of the fouled pearl oyster...
Tipo: Journal Contribution
Palavras-chave: Pearl oysters; Foulers; Oxygen consumption; Excretion.
Ano: 2007
URL: http://hdl.handle.net/1834/5861

Estudios Comparativos para la Determinación de la Edad de Juvenilesde la Madreperla Pinctada Mazatlanica (HANLEY, 1856) Colectados en la Bahía de La Paz, B.C.S.
Provedor de dados: 20
Autores: Lee, P.
La ostra perlera Pinctada mazatlanica pertenece a la familia Pteriidae la cual tiene la habilidad de producir perlas. Sus perlas y nácar de alta calidad las ha convierte en un recurso natural de preferencia para su explotación. Desafortunadamente muchos aspectos de la determinación de la edad son pobre a pesar de ser un aspecto importante para su manejo pesquero. El desarrollo larvario puede durar de 23-25 días antes de fijación dependiente de la temperatura, salinidad, disponibilidad de alimento y substrato. Las marcas de crecimiento en la prodisoconcha y la disoconcha podrían representar el crecimiento diario de la larva y el juvenil, sin embargo su validación sustentaría la determinación de la edad que puede luego ser aplicado a modelos matemáticos....
Tipo: Theses and Dissertations
Palavras-chave: Oyster culture; Pearl oysters; Oyster culture; Http://aims.fao.org/aos/agrovoc/c_5483.
Ano: 2010
URL: http://hdl.handle.net/1834/3645