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| Registros recuperados: 672 | |
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| Delaporte, Maryse; Soudant, P; Lambert, C; Jegaden, M; Moal, Jeanne; Pouvreau, Stephane; Degremont, Lionel; Boudry, Pierre; Samain, Jean-francois. |
| Within the framework of a national scientific program named "MORtalites ESTivales de l'huitre creuse Crassostrea gigas" (MOREST), a family-based experiment was developed to study the genetic basis of resistance to summer mortality in the Pacific oyster, Crassostrea gigas. As part of the MOREST project, the second generation of three resistant families and two susceptible families were chosen and pooled into two respective groups: "R" and "S". These two groups of oysters were conditioned for 6 months on two food levels (4% and 12% of oyster soft-tissue dry weight in algal dry weight per day) with a temperature gradient that mimicked the Marennes-Oleron natural cycle during the oyster reproductive period. Oyster mortality remained low for the first two... |
| Tipo: Text |
Palavras-chave: Summer mortality; Reproduction; Reactive oxygen species ROS; Hemocyte parameters; Genetic selection; Crassostrea gigas. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-3578.pdf |
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| Dardignac, Marie-jose; Prou, Jean. |
| Arnong the last ye3Is, three years are pointed out by paar mussei's recruitment in the Pertuis Breton. This lack leJds ta a Strong decrease of lhe cultivateà biamass. The influences of temperature and sunshine were studied. The lemperature daes nal seem ta be a very important faclor. On the other hand, awing ta the technicals used in the Pertuis Breton an important sunshine correlated with a spring tide during seed settlement on ropes appears ta be a maj or factor in spatfall suceess. This hypothesis is strenghened by the fact that, during the period of study no recruitment failure were observed on the off- shore long lines. |
| Tipo: Text |
Palavras-chave: Reproduction; Moules; Recrutement; Captage; Pertuis Breton; Département Charente-Maritime. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00141/25189/23295.pdf |
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| Huvet, Arnaud; Normand, Julien; Fleury, Elodie; Quillien, Virgile; Fabioux, Caroline; Boudry, Pierre. |
| Summer mortality of the Pacific oyster Crassostrea gigas is the result of a complex interaction between oysters, their environment and their pathogens. The physiological status of an oyster, especially its reproductive status, is suspected to play a significant role in the outcome of this interaction. As genetic variability exists for susceptibility to summer mortality, resistant (R) and susceptible (S) oyster lines were produced using a divergent selection scheme. The present paper reports a histological study on gonad area, which is representative of reproductive effort, in randomly chosen five R and five S oyster lines. The R lines showed a significantly lower gonad area than the S lines (P<0.001). with an estimated mean difference of 12.5%, whereas,... |
| Tipo: Text |
Palavras-chave: Bivalve mollusc; Crassostrea gigas; Reproduction; Selected lines; Summer mortality. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00006/11766/8502.pdf |
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| Grellier, Patrick. |
| Vertebrate Cyclostome, the european sea lamprey is a sea spawning migrator amphihaline species, which is a parasite during its growing phase at sea. After the spawning migration, lampreys couple in the upper reach of water courses, they lay their eggs, then die from physiological misery. The eggs develop sheltered into a nest until hatching of small larvae, the ammocoetes. Morphologically very different from the adults, the ammocoetes spend a several years sedentary life, being burried into the sediment. Then, they metamorphose into young lampreys which undertake their downstream migration. As soon as they enter sea water, they continue growing at the expense of several species of fishes. |
| Tipo: Text |
Palavras-chave: Morphologie; Cycle Biologique; Migrations; Reproduction. |
| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/00085/19616/17256.pdf |
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| Delaporte, Maryse; Soudant, P; Lambert, C; Moal, Jeanne; Pouvreau, Stephane; Samain, Jean-francois. |
| The aim of this study was to test the effect of food quantity on energy storage and defense capacities of oysters during a reproductive cycle. One-year-old Crassostrea gigas oysters were fed two different dietary rations (4% and 12% of oyster dry weight in algal dry weight per day) in controlled experimental conditions over an annual cycle. Oyster dry weights, carbohydrate and lipid contents, energetic adenylate charge, and hemocyte parameters of oysters were significantly affected by reproductive processes related to seasonal temperature variation and, to a lesser extent, by the dietary rations. Energy parameters decreased during gametogenesis as gonads developed then increased during the gonad resorption phase. The additional energy provided to oysters... |
| Tipo: Text |
Palavras-chave: Reactive oxygen species production; Reproduction; Phagocytosis; Hemocyte parameters; Energy storage; Crassostrea gigas. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1549.pdf |
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| Boudry, Pierre; Degremont, Lionel; Bedier, Edouard; Pouvreau, Stephane; Normand, Julien; Ernande, Bruno. |
| To date, the most significant method to genetically reduce reproductive effort in the Pacific oyster (Crassostrea gigas) has been through the production of triploids, especially since the development of tetraploid lines allowing the breeding of 'natural' triploids. Gametogenesis of triploid oysters is strongly reduced compared with diploids, although they are not fully sterile and can produce viable gametes and some progenies when crossed with diploids. Reduced reproductive allocation and higher heterozygocity are commonly proposed as the main reasons why triploids often present superior yield compared with diploids. Temperature and food availability are known to favour gametogenesis in triploids, but the existence of genetic variation for this trait... |
| Tipo: Text |
Palavras-chave: Selective breeding; Reproduction; Genetic variation; Crassostrea gigas; Pacific oyster; Genetic. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/acte-3445.pdf |
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| Soletchnik, Patrick; Polsenaere, Pierre; Le Moine, Olivier. |
| Historiquement, les pêches de larves de l’huître creuse (C. gigas) ont lieu en six stations du BMO depuis les années 70, de début juin à la première semaine de septembre. La comparaison des captures saisonnières et hebdomadaires entre les périodes P1 (1977-1991) et P2 (2000-2015) montre un ajustement de la distribution des captures de larves à un modèle polynomiale d’ordre 4 pour P1 (R2 = 0,77), puis d’ordre 2 pour P2 (R2 = 0,86). Les modèles de distribution des captures montrent que la saison de reproduction a doublé entre les deux périodes. Elle s’étend aujourd’hui de juin à septembre. Devant l’extension de la saison de reproduction, la saison de pêche expérimentale est aujourd’hui trop réduite. Toutefois, le pic d’abondance des captures n’a pas changé... |
| Tipo: Text |
Palavras-chave: Huître; C. gigas; Changement global; Réchauffement climatique; Reproduction; Larve; Mortalité; Phénologie; Ostréiculture; Bassin de Marennes Oléron; Phytoplancton; Chlorophylle a; Température. |
| Ano: 2018 |
URL: http://archimer.ifremer.fr/doc/00441/55239/56723.pdf |
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| Suquet, Marc; Gourtay, Clemence; Donval, Anne; Le Goic, Nelly; Quere, Claudie; Malo, Florent; Le Grand, Jacqueline; Ratiskol, Dominique; Mingant, Christian; Fauvel, Christian. |
| Most publications devoted to the cryopreservation of mollusc sperm have focused on the definition of technical protocols, avoiding the description of sperm quality after thawing. The present study investigated the effects of cryopreservation on sperm quality in the great scallop. Wild scallop were fished during the natural spawning period and conditioned in the hatchery before use. Sperm samples were obtained after intragonadal injection of serotonin and cryopreserved using a previously published protocol. Sperm quality was assessed using a panel of four parameters: sperm motility characteristics, using a a computer assisted sperm analysis plugin with Image J, intracellular ATP content using an ATP-Lite kit, sperm integrity, using flow cytometry and sperm... |
| Tipo: Text |
Palavras-chave: Pecten maximus; Reproduction; Gamete; Sperm; Cryopreservation. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00317/42862/43912.pdf |
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| Perodou, Dominique; Latrouite, Daniel. |
| La perspective de reconstituer des gisements de pétoncle ou de pratiquer une aquaculture extensive nous a conduits à réaliser en baie de Quiberon des expériences de captage de naissain. Des observations sur la reproduction ont été faites à cette occasion. La période d'activité gonadique s'étend de Mars à Septembre mais la ponte principale intervient au début du mois de juin ; elle ne se concrétise par un bon taux de fixation que si la température de l'eau est au moins égale à 16°C. Des pontes secondaires sont observées jusqu'en Août - Septembre. Cette espèce est hermaphrodite est la relation entre le sex-ratio et la taille conduit à suggérer que la création de réserves provisoires sur un gisement exploité serait de nature à améliorer le potentiel... |
| Tipo: Text |
Palavras-chave: Pétoncle noir; Chlamys varia; Reproduction; Captage; Baie de Quiberon. |
| Ano: 1981 |
URL: http://archimer.ifremer.fr/doc/00021/13260/10307.pdf |
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| Benabdelmouna, Abdellah; Hubert, Mathias; Cantin, Christian; D'Amico, Florence; Grizon, James; Seugnet, Jean-luc. |
| Le suivi de la ploïdie du naissain capté dans les deux principaux bassins de captage que sont Marennes Oléron et d'Arcachon a été réalisé par cytométrie en flux . Les échantillons de naissain naturel ont été prélevés sur 3 sites dans chaque bassin et pour un total de 1002 animaux analysés. En tenant compte de notre échantillonnage, nos résultats de suivi de ploïdie concluent à l 'absence d'animaux polyploïdes. triploïdes ou tétraploïdes, captés dans les deux bassins prospectés. Ces résultats sont conformes aux prévisions en la matière et n'apportent donc aucune raison de modification des pratiques en cours dans la filière ostréicole triploïde. Cependant, pour la deuxième année consécutive, les deux bassins de captage que sont Marennes Oléron et Arcachon... |
| Tipo: Text |
Palavras-chave: Génétique; Reproduction; Captage; Ploïdie; Aneuploïdie; Marennes Oléron; Arcachon; Crassostrea gigas. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/00070/18131/15679.pdf |
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| Registros recuperados: 672 | |
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