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| Registros recuperados: 919 | |
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| Broquard, Coralie. |
| Knowledge about the mode of reproduction and the sex determination of the cupped oyster Crassostrea gigas remains limited. As a sequential hermaphroditic species, sex determination takes place several times during its lifetime. As part of this thesis, the sexual phenotypes of the first 6 years of life of oysters were identified in two cohorts. Thus, the sex ratio was biased towards females from the first sexual maturity, as well as for all subsequent years. After six years of sexing, 42%, 32%, 19%, 5%, 1% and 0.1% of oysters showed 0, 1, 2, 2, 3, 4 and 5 sex changes. The frequency of sex changes also decreased with age (34% between years 1-2 to 9% between years 5-6). This thesis work has also sought to determine the influence of sex and sex change on the... |
| Tipo: Text |
Palavras-chave: Déterminisme sexuel; Facteurs moléculaires; Sex determination; Hermaphroditism; Growth; Molecular factors; C. gigas. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00692/80422/83558.pdf |
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| Hadjadji, Imen; Laabir, Mohamed; Frihi, Hocine; Collos, Yves; Shao, Zhao Jun; Berrebi, Patrick; Abadie, Eric; Amzil, Zouher; Chomérat, Nicolas; Rolland, Jean-luc; Rieuvilleneuve, Fabien; Masseret, Estelle. |
| Physiological plasticity gives HABs species the ability to respond to variations in the surrounding environment. The aim of this study was to examine morphological and physiological variability in Alexandrium pacificum R.W. Litaker (Group IV) (former Alexandrium catenella) blooming in Annaba bay, Algeria. Monoclonal cultures of up to 30 strains of this neurotoxic dinoflagellate were established by the germination of single resting cysts from the surface sediment of this southern Mediterranean marine ecosystem. Ribotyping confirmed formally for the first time that A. pacificum is developing in Eastern Algerian waters. Toxin analyses of A. pacificum strains revealed substantial intraspecific variability in both the profile and toxin amount. However, the... |
| Tipo: Text |
Palavras-chave: Alexandrium pacificum; Mediterranean; Toxin profile; Growth; Intraspecific variability. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00624/73620/73598.pdf |
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| Rico Villa, Benjamin; Pouvreau, Stephane; Robert, Rene. |
| Ingestion, growth and metamorphosis of Pacific oyster, Crassostrea gigas, larvae were studied under controlled conditions of food density and temperature using a combination of a flow-through rearing system and a hydrobiological monitoring device. In a first experiment larvae were exposed to three different phytoplankton densities (12, 20 and 40 cells μl-1) while in a second trial larvae were reared at five different temperatures (17, 22, 25, 27 and 32°C). Both food concentration and temperature significantly affected the larval physiology throughout the entire development from D-veliger to young spat. Larvae survived over a wide range of both environmental parameters with high survival at the end of experiments. The feeding functional response... |
| Tipo: Text |
Palavras-chave: Temperature; Food; Growth; Ecophysiology; Bivalve larvae; Crassostrea gigas. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4747.pdf |
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| Mazurie, Joseph; Soletchnik, Patrick; Ropert, Michel; Fleury, Pierre-gildas; Auby, Isabelle; Maurer, Daniele; Bacher, Cedric. |
| Monitoring of Crassostrea gigas performances, from two year-classes, during 12 years, in various French shellfish farming areas have revealed great inter-annual and inter-sites differences in reproduction, growth, mortality or quality of oysters (meat content, Polydora infestation...). The presentation attempts to highlight how a comparative analysis of existing temporal or spatial data on molluscs, water quality, geography or meteorogoly may help to better understand and manage shellfish ecosystems. The range of hydrobiological conditions (food availability, turbidity, temperature...) recorded at national, pluriannual scale, in relation to shellfish performances, enlarges the base of such relationship. However, undirect causative factors, either natural... |
| Tipo: Text |
Palavras-chave: Climatic modulation; Hydro geography; Reproduction; Growth; Spatial differences; Water quality; Mortality; Shellfish productivity. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/acte-3318.pdf |
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| Mellon-duval, Capucine; De Pontual, Helene; Metral, Luisa; Quemener, Loic. |
| Growth of European hake was estimated from the results of a conventional tagging study in the Gulf of Lions, the first tagging experiment to have been undertaken on the species in Mediterranean waters. In all, 4277 hake 15–40 cm long were tagged and released on the inshore fishing grounds during spring 2006. The overall recapture rate was 6.5% and times-at-liberty ranged from 1 to 717 d. Growth rate in hake varied with size and sex. The estimated growth parameter (von Bertalanffy k) was estimated as double previously published values based on size frequency distribution in the area. Compared with recent growth parameters derived from the tagging experiments in the Bay of Biscay, k was estimated to be slightly lower in the Gulf of Lions. With this faster... |
| Tipo: Text |
Palavras-chave: Age estimation; European hake; Growth; Mediterranean; Tagging. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00000/11134/11532.pdf |
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| Bodin, Nathalie; Le Loch, Francois; Hily, Christian; Caisey, Xavier; Latrouite, Daniel; Le Guellec, Anne-marie. |
| The ontogenic variations of nitrogen and carbon stable isotopic signatures (delta N-15 and delta C-13) were investigated in two spider crab (Maja brachydactyla) populations inhabiting in different biotopes of Western Europe. The Iroise Sea population is localized in Western Brittany and characterized by a seasonal migration occurring on a large bathymetric and habitat gradient while the Seine Bay population, in the Eastern English Channel, remains in a more homogeneous environment during its migration. In the Iroise Sea population, delta C-13 Values increased significantly both with body size and age, revealing a shift towards "benthic-component" prey with spider crab growth. On the contrary, neither body size nor ageing gave rise to a significant trophic... |
| Tipo: Text |
Palavras-chave: Migration; Marine decapod crustaceans; Growth; Feeding; Carbon and nitrogen stable isotopes. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2535.pdf |
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| Ropert, Michel; Pien, S.; Mary, Charlotte; Bouchaud, B.. |
| Le réseau régional de suivi REMONOR s'appuyant sur les acquis du réseau national REMORA de l'Ifremer, évalue chaque année la mortalité, la croissance et la qualité sur deux classes d'âges d'huîtres creuses (« adultes » = 2 ans et « juvéniles » = 1 an), réparties entre différentes stations dans les principaux secteurs ostréicoles Bas-Normands. Ce réseau, mené en collaboration par le LERN (Laboratoire Environnement Ressources de Normandie) et le SMEL (Syndicat Mixte de L'Equipement du Littoral), intègre deux nouvelles stations en 2006 : Veules les Roses (VR01), dont le suivi, allégé l'an dernier, est aujourd'hui complet et Denneville (CO10) qui doit compléter les connaissances sur le nord de la Côte Ouest du Cotentin. Une station est à l'étude cette année... |
| Tipo: Text |
Palavras-chave: REMORA; Quality; Growth; Mortality; Normandy; REMONOR; Cupped (gigas) oyster; Crassostrea gigas; REMORA; Qualité; Croissance; Mortalité; Basse Normandie; REMONOR; Huître creuse; Crassostrea gigas. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/rapport-3468.pdf |
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| Fleury, Pierre-gildas; Ruelle, Francois; Claude, Serge; Palvadeau, Hubert; Robert, Stephane; D'Amico, Florence; Vercelli, Catherine; Chabirand, Jean-michel. |
| 1. Introduction: network organisation in 1997. The REMORA network - REseau MOIIusques du département Ressources Aquacoles de l'Ifremer - (Ifremer's Aquaculture Resources Department Mollusc Network) has been evaluating, since 1993, hollow oysters' growth (Crassostrea gigas) in major French oyster beds. In order to do so, it has followed up on a yearly basis the growth of a unique oyster batch shared among different stations in the main French raising areas. Releasing takes place in February and picking happens in November or December; intermediary sampling is done in June and September. All operations happen on the same dates for all stations. A national report is published each year. 'Regional' stations are sometimes added to the national network, but they... |
| Tipo: Text |
Palavras-chave: France; Growth; Network of monitoring; Crassostrea gigas; Oyster culture. |
| Ano: 1998 |
URL: http://archimer.ifremer.fr/doc/1998/rapport-1765.pdf |
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| Berthome, Jean-paul; Prou, Jean; Bodoy, Alain. |
| Growth of the japanese oyster, Crassostrea gigas was monitored during 4 years, by following the recruitment of the year 1978, held in rearing conditions. After three and half years, the average length was la cm and the average total weight was 80 g. Clear seasonal changes were observed on the growth in length and weight. An important loss in dry weight occured in July, during the release of gametes. Such losses constituted 29 %, 43 % and 60 % of the dry weight, respectively for individuals which were 2 years, 3 years and 4 years old. The higher instantaneous growth rates (G) were observed during spring and at the beginning of summer. Growth model of Von Bertalanffy, gave the best estimate for the length growth of the species. During the 1979-1982... |
| Tipo: Text |
Palavras-chave: Growth parameter; Growth model; Reardd stock; Crassostrea gigas; Oyster; Growth; Descripteurs de croissance; Modèle de croissance; Stock cultivé; Crassostrea gigas; Huître; Croissance. |
| Ano: 1986 |
URL: http://archimer.ifremer.fr/doc/1986/publication-2967.pdf |
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| Vandeputte, Marc; Dupont Nivet, M; Haffray, P; Chavanne, H; Cenadelli, S; Parati, K; Vidal, Marie-odile; Vergnet, Alain; Chatain, Beatrice. |
| Selective breeding of European sea bass (Dicentrarchus labrax) receives a growing interest, as the estimated heritability of growth is medium to high. In this study, we compared the offspring of four groups of sea bass sires, mated with the same wild dams: wild (W), first generation of domestication (D), first generation of mass selection for length (M), first generation of PROSPER-like selection for length (P). The comparison was done both in replicated tanks (separate rearing) and in mixed tanks (mixed rearing) where sire origins were recovered by genotyping of eight microsatellite markers. Weight, length and growth rate were measured from day 238 post-fertilization (69 g mean weight) to day 611 post-fertilization (390 g mean weight). Both in mixed and... |
| Tipo: Text |
Palavras-chave: Nephrocalcinosis; Competition; Microsatellites; Parentage assignment; Realized heritability; Selection response; Growth; Selective breeding; Dicentrarchus labrax; European sea bass. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-5303.pdf |
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| Boussouar, Ahmed; Le Bihan, Soizick; Arino, Ovide; Prouzet, Patrick. |
| The paper presents a mathematical model of the early larval stage, from spawn to the resorption of the yolk-sac, of the anchovy, Engraulis encrasicolus, of the Bay of Biscay. The model describes the temperature-dependent growth and drift of passive larvae by the currents and vertical turbulence. A numerical code has been built and numerous simulations, fed by both biological (egg surveys by AZTI-San Sebastian, Spain, and IFREMER, France) and physical (circulation model by IFREMER-Brest, France) data, were undertaken. Their main features are presented and discussed here, and some conclusions on the possible utilization of the results in improving estimates of anchovy stocks by the daily egg production method are drawn. |
| Tipo: Text |
Palavras-chave: Passive stage; Numerical simulation; Migration; Growth; Anchovy; Stade passif; Simulation numérique; Migration; Croissance; Anchois. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/2001/publication-518.pdf |
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| Frecon, Pierre. |
| INTRODUCTION For several years, intensive aquaculture has been aiming at experimentally building shortened food chain allowing commercial farming of one mollusk or fish specie. Therefore, CNEXO (IFREMER) developed several branches in its laboratories, each one starting with the growing of one or several unicellular algae which primary production was utilised to feed, either an intermediary herbivore crustacean, or directly larvae or juvenile mollusks (abalone, scallops...). A first step consisted in setting up then trivialize in vitro algal production. Now that we can benefit from routine farming, it seems interesting to move on to a second step, a more analytical one, in order to possibly optimize this type of production. The object of this DEA internship... |
| Tipo: Text |
Palavras-chave: Nitrogenized nutritive salts; Light; Growth; Unicellular seaweed; Intensive aquiculture; Sels nutritifs azotés; Lumière; Croissance; Algue unicellulaire; Aquaculture intensive. |
| Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/1984/rapport-1654.pdf |
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| Maestrini, S; Rochet, M; Legendre, L; Demers, S. |
| Nutrient analyses were done in melted ice, frazil and sea water of the upper part of the water column, where as major constitutive elements of micro-algae were analysed. Measurements of nutrient uptake were carried out with frazil algae incubated at -1.5 degree C in a field incubator. Differential-enrichment bioassays and mean N/P ratio (5.9) demonstrated that actual growth of the cultures was nutrient-limited. Nitrogen governed the algal yield when illumination and grazing allowed the microalgae to grow. It concluded that the epontic dynamics is not only controlled from above, by the seasonal (climatic) changes in light intensity as generally assumed, but also from below, by the short-term (hydrodynamic) events of vertical mixing that replenish the... |
| Tipo: Text |
Palavras-chave: Nutritive value; Growth; Food absorption; Algae; Ice water interface; Biomass; Nutrients (mineral). |
| Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/1984/acte-1533.pdf |
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| Registros recuperados: 919 | |
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