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Registros recuperados: 42
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Modélisation biophysique pour la prévision du recrutement ArchiMer
Allain, Gwenhael.
Exploited fish populations are dependent on recruitment (i.e. size of the new year class) to sustain their abundance. Recruitment variations are related to hydroclimatic variations and may accentuate the detrimental effects of fishing. Recruitment prediction requires accurate fisheries oceanographic tools, which are expected to be more reliable than large-scale correlation analyses between fish abundance and climate variables. Recruitment is the result of the integration over a season and large oceanic areas of processes affecting larval survival, which are dependent on small-scale mechanisms. Hydrodynamic models are a tool to perform this integration. This thesis aims at exploring and modelling physical-biological interaction mechanisms in order to...
Tipo: Text Palavras-chave: Anchovy; Upwelling; Turbulence; Retention; Fisheries management; Population dynamics; Stock environment interaction; Stock recruitment relation; Scale integration; Individual based models; Survival; Growth; Otolith; Physical biological interactions; Prediction; Recruitment; Turbulence; Rétention; Méso échelle; Intégration des échelles; Modèle de survie; Modèle de ponte; Modèles individu centrés; Modèles de corrélation; Modèles stochastiques; Juvéniles; Larves; Otolithe; Modèle de croissance; Interactions physique biologie; Prévision; Recrutement.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/these-5.pdf
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Déterminisme du recrutement de la sole. Phase pélagique - Résultats des campagnes 1985 ArchiMer
Arbault, Suzanne; Camus, Patrick; Hersart De La Villemarque, Jacqueline; Koutsikopoulos, Constantin.
In order to analyse the recruitment process of a commercial fish, the common sole has been selected for making researches into the mecanisms which have an effect upon the distribution of the young fish stages and upon the plenty of the recruitment. In 1985, during three surveys for eggs and larvae off the estuary of the river Loire in march and april, severa! points have been studied : - physical and chemical data of the sea - distribution of eggs and larvae - vertical distribution of larvae in a little scale - some results on nutrition of larvae.
Tipo: Text Palavras-chave: Sole; Oeufs; Larves; Recrutement; Sole; Eggs; Larvae; Recrutment.
Ano: 1986 URL: https://archimer.ifremer.fr/doc/00503/61493/65304.pdf
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Absence de captage de Crassostrea gigas dans le bassin de Marennes-Oléron en 1981 : causes et conséquences ArchiMer
Berthome, Jean-paul; Deslous-paoli, Jean-marc; Heral, Maurice; Razet, Daniel; Garnier, Jacqueline.
The want of C. gigas spat-catching in the Marennes-oleron basin in 1981 can be due to various different reasons which are analysed here. Physico -chemical and trophic factors that can induce variations in the quality of gametogenesis, are successively in comparison with the year 1979 when reproduction was good. The biochemical evolution and a study of gonads slow a lack in maturation in 1981 even during the summer period. Late maturation of gonads bring about physiological consequences which induced mortality of cultivated oysters at the end of winter. A feeble recruit and a decrease of the cultivated stock have economic consequences which here sketched up.
Tipo: Text Palavras-chave: Larvae; Recrutment; Spat; Crassostrea gigas; Oysters; Larves; Recrutement; Captage; Crassostrea gigas; Huîtres.
Ano: 1982 URL: http://archimer.ifremer.fr/doc/1982/acte-2948.PDF
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Description, évolution et importance des différentes techniques de captage en rivière Seudre (bassin de Marennes-Oléron) : incidence sur la production d'huîtres creuses C. gigas ArchiMer
Berthome, Jean-paul; Razet, Daniel; Garnier, Jacqueline.
Dealing with the study of the oyster stocks in Marennes Oleron basin, a method is set up to study oystr origin. Various collectors, factory-made or hand-made (about 90% of the whole) are described. Technical evolution, bound to the importance of potential catching in three concerned districts depands on the catching ability of the different types of collectors. The catching, achieved in the Seudre river, represents nearly 1 400 million units, wich is a theorical potentail quantity of 30 000 tons of adults oysters
Tipo: Text Palavras-chave: Larvae; Recrutment; Crassostrea gigas; Oysters; Oyster stock; Technique captage; Recrutement; Crassostrea gigas; Huîtres; Evaluation stocks.
Ano: 1981 URL: http://archimer.ifremer.fr/doc/1981/acte-2935.pdf
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Etude bio-économique de l'exploitation des ressources sous diverses hypothèses de gestion ArchiMer
Biseau, Alain; Ould El Kettab, Mustapha.
The model developed is a multi-species, multi-fleet and multi-sector model that consists of a dynamic allocation of the fishing effort. It can therefore measure the amplitude of the effort's generated outputs by strict, implemented and honoured regulatory measures. The management measures likely to be simulated give an account of the main trends of the regulations in effect in Community waters. Their effects on both the resource and the fleets are evaluated. Each stock, confined or not to a sector, has its own dynamic described by a model structured by ages: recruitment is assumed to be constant. Biological interactions (intra- and inter-species contact) as well as the problems of exchanges between sectors are not taken into account. In order to treat the...
Tipo: Text Palavras-chave: Dynamique des stocks; Eaux communautaires; Recrutement; Activité des flottilles; Mesures reglementaires; Gestion de la ressource; Modèle biologique.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/1999/rapport-2578.pdf
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Développement et utilisation des marqueurs génétiques hypervariables chez les espèces marines. Rapport de synthèse 1995-1998 ArchiMer
Bonhomme, Francois; Gerard, Andre.
L'objectif scientifique de l'Unité de Recherche Marine n0 16 est de partager les savoir faire conceptuels et méthodologiques des deux équipes, pour faire aboutir des programmes appliqués ou fondamentaux dans le domaine de la génétique des organismes marins. Ces programmes concernent plus particulièrement le développement et l'utilisation des marqueurs génétiques fournis par les techniques de biologie moléculaire dans les programmes suivants: Chez les huîtres des genres Ostrea et Crassostrea : Le modèle prioritaire de l'URM sera les huîtres Crassostrea et Ostrea. Pour des raisons historiques, les recherches sur Ostrea sont plus avancées et donneront des résultats plus rapidement. 1-Sélection assistée par marqueurs chez Ostrea edulis et Crassostrea gigas...
Tipo: Text Palavras-chave: Génétique; Marqueur génétique; Biologie moléculaire; Sélection génétique; Ressource génétique; Recrutement; Bivalvia; Crassostrea; Ostrea; Pisces; Dicentrarchus labrax; Génotypage.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00043/15459/12834.pdf
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Les bouchots à Mytilus edulis Linnaeus dans l'écosystème estuarien du bassin de Marennes-Oléron (France): aspects biologique et bioénergétique ArchiMer
Boromthanarat, Somsak.
L'étude des moules de bouchots, Mytilus edulis L. a été réalisée pour caractériser les phénomènes biologiques et leur importance énergétique dans le bassin de Marennes-Oléron. Le suivi hydrobiologique a montré que la nourriture disponible pour les moules est plus abondante du printemps au début de l'été. Il a été possible de mettre en évidence une compétition spatiale extrêmement forte, au niveau intraspécïfique. Les moules cultivées à partir du transfert des naissains collectés sur cordes poussent plus rapidement que celles provenant d'une fixation directe du naissain sur les bouchots. La période de ponte est étalée entre février et  mai d'où l'existence de recrutement en juin. On peut proposer comme période de pêche, une saison allant de juin à novembre,...
Tipo: Text Palavras-chave: Mytiliculture; Mytilus edulis; Production; Recrutement; Composition biochimique; Indice de qualité; Bilan énergétique.
Ano: 1986 URL: http://archimer.ifremer.fr/doc/00441/55215/56689.pdf
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Reproduction et recrutement de Mytilus edulis L. cultivée sur les bouchots du bassin de Marennes-Oléron ArchiMer
Boromtharanat, S; Deslous-paoli, Jean-marc; Heral, Maurice.
Observations on the gonads of 50 mm mussels, made during 1983 and 1984, showed that the onsert of gametogenesis occured during September and that the gonads reached maturity in December. Spawning took place from early February to April at temperatures from 10 to 12°C. The flesh had a high water content at the beginning of the spawning period. The pelagic live of the larvae lasts about 30 days with settlement occurring in June when some 90 and 100 spats settle on 1 cpm of rope per day. The intensity of recruitment was 56.10(4) and 722.10(4) larvaes on rope corresponding to a square meter during 1983, and between 28.10(4) and 81.10(4) during 1984.
Tipo: Text Palavras-chave: Crawl; Recruitment; Reproduction; Mytilus edulis; Bouchot; Recrutement; Reproduction; Mytilus edulis.
Ano: 1987 URL: http://archimer.ifremer.fr/doc/1987/publication-2865.pdf
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Les différents systèmes de collecteurs de naissain ArchiMer
Boury, Maurice.
Le naissain est récolté sur des matériaux très variés : pierres, coquilles, bois, tuiles non chaulées, tuiles chaulées. De plus, le même matériel peut être disposé de façons différentes. Exemple : coquilles étalées sur le fond et coquilles assemblées en chapelets et suspendues dans l'eau.
Tipo: Text Palavras-chave: Huître; Reproduction; Naissain; Collecteur; Recrutement.
Ano: 1929 URL: http://archimer.ifremer.fr/doc/00005/11586/8212.pdf
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Analyse des petits pelagiques, sardine et anchois, dans le golfe de Gascogne ArchiMer
Coiffec, Gaelle; Duhamel, Erwan; Biseau, Alain; Danzart, Marc.
Since 1993 the yearly amounts of sardine landings for the Bay of Biscay fishing ports have experienced a constant increase (10,000 tonnes in 1993); on that account sardine is the first species landed in the fishing ports of the Bay of Biscay (15,000 tonnes in 2003). It is sold 0.54 € / kg (constant price over ten years) which means a 8,100 k€ turnover in 2003 and the 12th rank in value landed in the fishing ports of Bay of Biscay. Though anchovy landings have decreased over the last ten years, especially since 2001, this species occupies the 3rd rank of the highest landings (7,300 tonnes) of the Atlantic shoreline in 2003.The decrease of anchovy landings over the last ten years may account for the high increase of its constant sale price of 1.5 € / kg from...
Tipo: Text Palavras-chave: Purse seiner; Midwater pair trawler; Sardine; Anchovy; Pelagic; Bay of Biscay; Recrutement; Senneur; Chalutier pelagique; Bolincheur; Sardine; Anchois; Pelagique; Golge de Gascogne.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/rapport-2287.pdf
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Manque de naissain de moules pendant trois années consécutives dans les bouchots du Pertuis Breton. Observations préliminaires sur l'influence de la température et de l'ensoleillement ArchiMer
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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Otoliths imprinting of sole (Solea solea) from the Bay of Biscay: a tool to discriminate individuals from nursery origins? ArchiMer
De Pontual, Helene; Lagardere, Francoise; Troadec, Herve; Batel, Alain; Desaunay, Yves; Koutsikopoulos, Constantin.
Sole nurseries are located in the main bays and estuaries of the Bay of Biscay, where juveniles from the same stock. concentrate and constitute temporarily isolated groups. This context being favourable for elemental analyses of juvenile otoliths this study has been initiated with the aim of obtaining environmental imprints of the main nurseries of origin of juveniles recruiting to the adult stock, and of evaluating the relative contribution of these nurseries to the stock. The objectives were to compare (i) the otolith elemental imprints obtained by sampling juveniles in the Loire and the Gironde nurseries, and (ii) two multi-element analysis techniques: laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) and solution-based ICPMS...
Tipo: Text Palavras-chave: Recruitment; Juvenile; Estuarine nursery; ICPMS; Trace elements; Otolith; Recrutement; Juvénile; Nourricerie estuarienne; ICPMS; Eléments traces; Otolithe.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/2000/publication-537.pdf
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Effets climatiques sur les écosystèmes marins. Exemple du recrutement des Crustacés Cirripèdes sur la côte ouest du Cotentin ArchiMer
Dreves, Luc.
A nuclear power plant is set up at Flamanville (Channel; West coast of the Cotentin). For monitoring studies, one species (or a group of species) has been chosen in each major unit for a reference population dynamics study. Hard bottoms are covered by several species of barnacles. These species present different temperature affinities, and have reached here an equilibrium stage. The recruitment period of Balanus balanoides, the main species, has been determined. A relationship is established between the wintry temperature and the numerical importance of its spring recruitment.
Tipo: Text Palavras-chave: Centrale nucléaire; Flamanville; Surveillance; Crustacés cirripèdes; Balanus balanoides; Recrutement; Flamanville; Monitoring; Nuclear power plant; Balanus balanoides; Barnacles; Recruitment.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00396/50759/51472.pdf
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Les baudroies ou lottes, espèces majeures de la pêche française: situation et perspectives ArchiMer
Dupouy, Herve; Andro, M; Avrilla, J.l.; Fifas, Spyros; Kergoat, Bernard; Morizur, Yvon; Mtimet, M; Pennober, J.p; Rivoalen, Jean-jacques.
Tipo: Text Palavras-chave: North East Atlantic; France; Trade analysis; Commercial species; Angler; Monk; SEM; Débarquement; Recrutement; Engins de pêche; Lophius budegassa; Lotta lotta; Lophius piscatorius; Baudroie; Lotte.
Ano: 1993 URL: https://archimer.ifremer.fr/doc/1993/rapport-2187.pdf
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Colonisation d'un récif frangeant de l'île de La Réunion par les larves de poissons coralliens ArchiMer
Durville, P; Bosc, P; Galzin, R; Conand, C.
The colonization of a fringing reef of Reunion Island by fish larvae takes place essentially from August to February with two peaks, in August-September, when the water temperatures are coldest, and in February when they are at a maximum. The number of fishes, as well as the number of sampled species, present similar values over two consecutive years with, nevertheless, a strong variation in the species involved. In Reunion Island, the number of post-larvae which colonise the reef is one hundred to four hundred times lower than on larger and more structured reefs. This phenomenon could be explained by the geographical characteristics of the island. The stock control of the adult fish in Reunion could largely be the result of the arrival of post-larvae on...
Tipo: Text Palavras-chave: Colonisation larvaire; Recrutement; Poisson corallien; Récif frangeant; Île de La Réunion; Larval colonization; Recruitment; Coral fish; Fringing reef; Reunion Island.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/00322/43326/42928.pdf
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The influence of variability in larval dispersal on the dynamics of a marine metapopulation in the eastern Channel ArchiMer
Ellien, Celine; Thiebaut, Éric; Barnay, Anne-sophie; Dauvin, Jean-claude; Gentil, Franck; Salomon, Jean-claude.
In the English Channel, the polychaete Pectinaria in koreni forms isolated populations confined in bays and estuaries. To determine the influence of larval dispersal variability on the observed stock fluctuations of the three major Pectinaria koreni populations reported along the French coasts of the eastern Channel, larval dispersal was simulated using a 2D hydrodynamical lagrangian model integrating both the tidal residual and the wind-driven circulation. Year-to-year fluctuations of adult stocks were established from benthic surveys carried out between 1973 and 1998. Larval dispersal patterns vary between populations according to the relative importance of tidal advection and eddy diffusion so that local larval retention is maximal where tidal advection...
Tipo: Text Palavras-chave: Pectinaria koreni; Metapopulation; Modelling; Recruitment; Larval dispersal; Pectinaria koreni; Métapopulation; Modélisation; Recrutement; Dispersion larvaire.
Ano: 2000 URL: https://archimer.ifremer.fr/doc/2000/publication-535.pdf
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Un modèle empirique du recrutement pour le stock de coquilles Saint Jacques, Pecten maximus (L.) en baie de Saint-Brieuc (Manche, France) ArchiMer
Fifas, Spyros; Dao, Jean-claude; Boucher, Jean.
This paper proposes an empirical model for the recruitment of the scallop stock, Pecten maximus (L.), in Saint-Brieuc Bay (English Channel, France). This stock shows important fluctuations in recruitment. The use of traditional models for fish population dynamics based upon an equilibrium state were inadéquate. This model includes three independent variables: spawning biomass, effects of fishing effort on the unexploited year classes, and temperature. Correlations between these expressions of independent parameters and recruitment are systematically analysed. The choice of the final model relies on minimization of the total variance unexplained portion. Introduction of fishing pattern into the model is realized by testing fishing effort effects upon two...
Tipo: Text Palavras-chave: Recrutement; Modèle empirique; Pecten maximus; Température; Biomasse féconde; Effort de pêche; Recruitment; Empirical model; Pecten maximus; Temperature; Spawning biomass; Fishing effort.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/00189/30069/28557.pdf
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Influence du climat sur le recrutement et sur la production d'huîtres cultivées (Crassostrea angulata et Crassostrea gigas) dans le bassin de Marennes-Oléron (France) ArchiMer
Heral, Maurice; Deslous-paoli, Jean-marc; Prou, Jean.
Recruitment, marketed yield and cultivated biomasses of oysters Crassostrea angulata and Crassostrea gigas are compared to climatic indices for the period 1885-1984. Temperature plays a role up on the date of spawning but explains only partially the failure of recruitment, which has less influence on the marketed yield than on the total biomass Contrary to the sensitivity of wild molluscan stocks to climatic conditions, yield and biomass of these cultivated stocks are not hightly correlated to the annual and seasonal indices of rainfall and air temperature.
Tipo: Text Palavras-chave: Marennes Oleron Bay; Climatic conditions; Recrutment; Crassostrea gigas; Crassostrea angulata; Oysters; Marennes Oléron; Facteurs climatiques; Recrutement; Crassostrea gigas; Crassostrea angulata; Huîtres.
Ano: 1986 URL: http://archimer.ifremer.fr/doc/1986/acte-2972.pdf
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Influence des facteurs climatiques sur la production conchylicole du bassin de Marennes-Oléron ArchiMer
Heral, Maurice; Prou, Jean; Deslous-paoli, Jean-marc.
The authors are comparing the recruitment, the commercialised production, the cultivated biomasses of oysters Crassostrea gigas and Crassostrea angulata with the statistics of the meteorology (1885-1984). The temperature plays a role up on the date of spawning but partialy explains the lack of recruitment, which has less impact on the commercialised production than on the total biomass. The annual and seasonal characteristics of the precipitations and water temperatures do not show tight correlations with the variations of the production and of the biomass, for these cultivated populations in opposition with the sensitivity of the natural molluscan populations towards the climatic factors.
Tipo: Text Palavras-chave: Meteorology; Recruitment; Biomass; Production; Crassostrea angulata; Crassostrea gigas; Météorlogie; Recrutement; Biomasse; Production; Crassostrea gigas; Crassostrea angulata.
Ano: 1986 URL: http://archimer.ifremer.fr/doc/1986/publication-2968.pdf
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Biologie et écotoxicologie des véligères de Crassostrea Gigas (Thunberg) dans le bassin d'Arcachon ArchiMer
His, Edouard.
This study analyses the larval recruitment and biology in Crassostrea Gigas, in the Arcachon Bay. Three types of observations were conducted: - a study of the reproduction anomalies in C. gigas between 1976 and 1981. - observations of the particulate nutrition of the veligeres. - ecotoxicologic experiments (organostannic action on oyster reproduction, mostly). The reproduction anomalies in C. gigas could not be attributed to either the genitors' quality or the water quality in the Arcachon Bay, but to a perturbation of the veligeres' trophic regime; the hypothesis of an alteration of the nanoplancton in the Bay, during the summer period, and linked to the action of the organotins is highly considered. The assumption of responsibility of the particulate...
Tipo: Text Palavras-chave: Organostanniques; Ecotoxicologie; Nutrition; Anomalies de la reproduction; Bassin d'Arcachon; Crassostrea gigas; Véligères; Recrutement.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/1991/these-3347.pdf
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