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Registros recuperados: 26
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Amélioration de l'évaluation des stocks de mollusques cultivés en Charente- Maritime ArchiMer
Bacher, Cedric; Deslous-paoli, Jean-marc; Heral, Maurice; Prou, Jean.
The expansion of shellfish culture businesses (oysters, mussels, clams...) gives way to a competition for the use of limited food resources, especially in the Marennes-Oléron basin where water circulation is slow. Increasing the amount of cultivated molluscs leads, from a biological point of view, to:- a drop in growth performances- a rise in chronic mortalities, higher and higher, due to a weakness in the physiological state with a lack of stocks which would have compensated the habitat seasonal shortages (end of winter, etc...)- a greater weakness to diseases, linked to a deficient physiological state and a density rise which increases the proximity rate and thus, parasite propagation speed.For these primary reasons, and for the future of oyster culture,...
Tipo: Text Palavras-chave: Modélisation; Estimation; Echantillonnage; Mollusques; Marennes Oléron; Evaluation stocks.
Ano: 1986 URL: http://archimer.ifremer.fr/doc/1986/rapport-3841.PDF
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Analyse quantitative et qualitative des captures de tourteaux Cancer pagurus par la flottille de Manche-ouest ArchiMer
Latrouite, Daniel; Morizur, Yvon.
French potters from « Manche ouest » harbours ish edible crab Cancer pagurus in English Channel, Iroise Sea and along north Biscay Bay shelf. Monthly landings of the offshore fleet analysed from logbooks for the period 1985-1987 indicate changes in fishing areas. The mean length of males, the mean length of females and the sex-ratio have been analysed by Principal Component Analysis in 1981-1987 samples. The heterogeneity between catches from different statistical rectangle (30 x 40 nautical miles) was great enough to deduce a way of raising composition from samples to total landings. It also offers the possibility to verifiy and correct declaration on geographical origin of landings.
Tipo: Text Palavras-chave: Biscay Bay; Catch composition; France; Western Channel; Sampling; Iroise; Edible crab; Cancer Pagurus; Fishing; Golfe de Gascogne; Iroise; Manche; Echantillonnage; Composition des captures; Tourteau.
Ano: 1988 URL: http://archimer.ifremer.fr/doc/1988/acte-1416.pdf
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Echantillonnage des populations naturelles de mollusques compétiteurs trophiques des huîtres cultivées Crassostrea gigas du bassin de Marennes-Oléron : aspects méthodologiques ArchiMer
Sauriau, Pierre-guy.
The main problems involved in making biomass and density estimates of benthic mol1uscs are the choice of a sampling plan, the level of systematic errors and random errors. A stratified random sampling after optimum allocation was used in the case. The benthic molluscs estimates (biomass or density) are highly variable, due to their aggregated distribution. The sampling gear used is a Smith Mc-lntyre grab which introduce a bias in the estimates. Nevertheless, the Macoma baLthica community was predominant in the bay but Cerastoderma edul.e appeared to be the dominant specie.
Tipo: Text Palavras-chave: Cerastoderma edule; Macoma balthica; Marennes Oleron Bay; Crassostrea gigas; Stock assessment; Cerastoderma edule; Macoma balthica; Marennes Oléron; Crassostrea gigas; Echantillonnage.
Ano: 1986 URL: http://archimer.ifremer.fr/doc/1986/acte-2971.pdf
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Elaboration d'une technique d'évaluation des stocks conchylicoles : biomasses en élevage en 2001, et développement d'une méthode simplifiée à l'usage de la profession ArchiMer
Le Moine, Olivier; Razet, Daniel; Geairon, Philippe.
La connaissance des biomasses en élevage est un atout majeur en terme d'aménagement (restructurations, nettoyages collectifs de zones, etc . .. ) ainsi que dans la gestion de la campagne de commercialisation. La Section Régionale Conchylicole, ainsi que L'Organisation des Producteurs d'huîtres de Marennes Oléron, conscients des avantages qu'apporte cette connaissance, a contractualisé avec le Laboratoire Conchylicole de Poitou Charentes la mise au point de techniques plus rapides, et simplifiées à usage de la profession en ce qui concerne l'évaluation des stocks commercialisables dans la campagne. Les évaluations de stocks conchylicoles font partie des travaux que les laboratoires côtiers de l'lFREMER accomplissent de manière périodique, tous les cinq ans...
Tipo: Text Palavras-chave: Conchyliculture; Estimation stock; Technique; Biomasse; Echantillonnage; Bassin de Marennes Oléron.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/00095/20613/18248.pdf
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Elaboration d'une technique d'évaluation rapide des stocks conchylicoles à l'usage de la profession ArchiMer
Le Moine, Olivier; Geairon, Philippe; Razet, Daniel.
La connaissance des stocks commercialisables est un atout dans la gestion de la campagne de commercialisation. L'Organisation des Producteurs d'huîtres de Marennes Oléron, consciente des avantages que serait cette connaissance de manière précoce, a donc demandé à l'IFREMER, lors de la contractualisation profession - IFREMER 2001, de mettre au point une technique qui permettrait d'acquérir ces données de façon aussi simple et précise que possible. Les évaluations de stocks conchylicoles sont une des missions que les laboratoires côtiers de l'IFREMER accomplissent de manière périodique, tous les cinq ans à Marennes Oléron. L'année 2001 est celle de l'échantillonnage exhaustif à Marennes Oléron, opérée par le Laboratoire Conchylicole de Poitou-Charentes. Il...
Tipo: Text Palavras-chave: Stocks conchylicoles; Echantillonnage; Typologie; Evaluation; Marennes Oléron bassin; Charente-Maritime.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/00031/14242/11517.pdf
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Estimation de la biomasse d'huîtres non cultivées dans le bassin de Marennes-Oléron ArchiMer
Prou, Jean; Pouvreau, Stephane; Renaud, Vivian.
In the Marennes-Oléron oyster culture basin, the cultivated oyster stock shows an unbalanced age distribution: 25 000 to 30 000 tonnes are commercialized each year for a total cultivated biomass of 95 000 tonnes (1993). The biological overexploitation of the basin requires a reduction of the stock in order to get back to productivity rates that are compatible with the restrictions of the oyster market. This study gives an estimated natural deposit biomass of around 3 000 tonnes. An estimate of the abandoned and wild oyster biomass shows that 20 000 tonnes of these animals can be considered as competitors to cultivated oysters. [...].
Tipo: Text Palavras-chave: Bassin Marennes Oléron; Echantillonnage; Estimation; Répartition spatiale; Typologie; Biomasse; Crassostrea gigas; Huîtres.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/1994/rapport-4741.PDF
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Estimation des stocks de bivalves en élevage et des épibiontes dans la lagune de Thau et modélisation de la dynamique des populations d'huîtres creuses (Crassostrea gigas, Thunberg) ArchiMer
Gangnery, Aline.
In Thau Iagoon (Mediterranean Sea), shellfish are cultured in suspension. Molluscs are reared on ropes that are suspended on frames. Principal species concerned by breeding are Crassostrea gigas, Mytilus galloprovincialis and, in a less extent, Ostrea edulis. A new sampling method was developped to assess the total stock of cultured shellfish and was tested in July 1998 and April 1999. The total stock was found to be 19500 tons (± 1120 SE) in 1998 and 14100 tons (± 830 SE) in 1999, thus exhibiting temporal variations. Temporal differences in the total stock are mainly attributable to the breeding cycle but also to sorne exceptionnal events which occurred in Thau lageon in 1997 and 1998 (water anoxia, bacteriological crisis, bloom of toxic algae). In the...
Tipo: Text Palavras-chave: Etang de Thau; Bivalves; Echantillonnage; Dynamique; Modèle; Epibiontes.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00443/55478/57008.pdf
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Estimation des stocks de moules dans le Pertuis Breton en 1987 ArchiMer
Mazurie, Joseph; Dardignac-corbeil, Marie-jose.
Une estimation de la biomasse de moules présente sur les bouchots du Pertuis Breton situés au sud de la Sèvre niortalse a été réalisée en 1987 . Le but était de mettre au point une stratégie d'échantillonnage adaptée à ce mode de culture . La méthode utilisée est décrite et une optimisation de l'effort d'échantillonnage réalisée ; elle détermine pour différentes précisions l'effort à consentir. La biomasse étudiée a été estimée à 4 722 tonnes avec une précision de 14 %.
Tipo: Text Palavras-chave: Moules; Bouchots; Biomasse; Echantillonnage; Pertuis Breton; Mussels; Biomass; Sampling; Pertuis Breton.
Ano: 1988 URL: http://archimer.ifremer.fr/doc/00045/15589/12991.pdf
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Etude des activites halieutiques le long du littoral. Releves thermographiques en baie de la Possession et en baie de Saint Paul (La Réunion) ArchiMer
Bertrand, Jacques; Biais, Gerard; Taquet, Marc.
The follow-up of the activity of the boats practising offshore fishing in the North-West of the La Réunion Cbaies of the Possession and Paul Saint) was carried out over one year(April 86 - March 87) thanks to the application of a strategy of sampling allowing the collection of the following statistics: total effort and by machine, captures total and by species.The study allowed a first approach of the space-time distribution of the activity of the fleet. It reveals the very high participation of the yachtmen in the halieutic exploitation of the studied sector. It also highlights the importance of tunas in the captures, which in weight are largely majority.
Tipo: Text Palavras-chave: La Réunion; Echantillonnage; Petite pêche; La Réunion; Sampling; Small fishing.
Ano: 1987 URL: https://archimer.ifremer.fr/doc/1987/rapport-1584.pdf
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Evaluation des stocks mytilicoles des Pertuis Charentais, évolution de 1997 à 2001 ArchiMer
Le Moine, Olivier; Geairon, Philippe; Razet, Daniel.
La connaissance des stocks en élevage est un élément important de gestion de la ressource. L'appréciation de l'adéquation entre la disponibilité trophique du milieu et la biomasse d'animaux filtreurs rend ces évaluations indispensables. Dans le cadre de la gestion des écosystèmes conchylicoles côtiers, le stock en place est un élément clé, ainsi que sa variabilité spatiale; les performances de croissance et de mortalité (rendements biologiques), sont également des données nécessaires à une gestion rationnelle. Le Laboratoire Conchylicole de Poitou-Charentes de L'IFREMER, effectue un suivi de ces différentes variables. Les données de croissance pour les huîtres ainsi que la variabilité temporelle des réserves des huîtres sont suivies à travers le réseau...
Tipo: Text Palavras-chave: Mytilicutlure; Estimation stock; Taux occupation; Tonnage; Echantillonnage; Pertuis Charentais.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/00095/20612/18247.pdf
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Evaluation du stock de palourdes du bassin d'Arcachon ArchiMer
Bertignac, Michel; Auby, Isabelle; Sauriau, Pierre-guy; De Montaudouin, Xavier; Foucard, Julie; Martin, Sophie.
As part of a larger project financed by the European Union programme "Community initiative PESCA" on the study of "small scale fisheries" in Aquitaine (France), an estimation of the stock of clams in the Bassin d'Arcachon has been conducted. A two-stage stratified random sampling survey has been designed. Samples have been collected using a Hamon bottom sampler in 237 locations distributed over 24 km2. The clam Tapes philippinarum, which appeared in the basin following a series of aquaculture experiments in the mid eighties, is now the main species accounting for more than 90% of the abundance and the biomass, largely overcoming the European species Tapes decussata. The mean abundance and biomass (26 clams / m2 et l28g / m2) are above those estimated in...
Tipo: Text Palavras-chave: Palourde; Tapes philippinarum; Tapes decussata; Evaluation stock; Pêche; Pêche à pied; Echantillonnage; Bassin d'Arcachon; Clam; Tapes philippinarum; Tapes decussata; Stock assessment; Fishery; Sampling; Bassin d'Arcachon.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00105/21658/19240.pdf
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Evolution temporelle de la composition de la colonne d'eau pendant un cycle vives eaux- mortes eaux ArchiMer
Prou, Jean.
Premier bassin ostréicole français, Marennes-Oléron est un écosystème complexe dont la compréhension nécessite la mise en place d'études multidisciplinaires intégrées. L'IFREMER y développe depuis 1985 un programme de recherche axé sur la connaissance des écosystèmes aquacoles. L'Unité de Recherche des Ecosystèmes Aquacoles (DRV/RA/UREA), basée à La Tremblade est le principal support de ce programme. [Extrait introduction]
Tipo: Text Palavras-chave: Charente Maritime; Marennes Oléron; Modèle mathématique; Matière suspension; Courantologie; Marée; Echantillonnage; Variation temporelle; Colonne eau.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/1991/rapport-3844.pdf
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Exploitation des huîtres en Nouvelle Calédonie échantillonnage des stocks naturels d'huîtres de paletuviers (Saccostrea cucullata) et aménagement des pêches ArchiMer
Bodoy, Alain; Morin, Jocelyne.
We analysed a few aspects of oyster culture in New Caledonia. Oyster culture there is not very important, one farm producing 30 tonnes of Japanese oysters per year and the other one, 3 tonnes of rock oysters. Mangrove oyster deposits are traditionally exploited, and this exploitation lead to a decrease of the densities and biomasses observed in the most exploited estuaries. On the four monitored sites, the maximum size observed is comprised between 7.2 to 10 cm, for a mode comprised between 3.6 and 4.8 cm. Densities go from 31 to 251 oysters and biomasses, from 0.751 to 2.553 kg/m2. Regulations focus on the minimum collection size (6 cm) and a fishing prohibition period of 8 months. Based on our observations, we suggest that these dispositions be...
Tipo: Text Palavras-chave: Aménagement des Pêches; Stocks; Echantillonnage; Huître; Mangrove.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/acte-6527.pdf
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La conception et l'architecture navale en composite dans l'industrie de la plaisance ArchiMer
Dolto, G.
This paper gives a brief overview of design with composite materials for the pleasure boat industry. The dimensioning of sail and motor boats is described and material properties are discussed from the point of view of a naval architect.
Tipo: Text Palavras-chave: Yachting; Mechanical properties; Ship technology; Ship design; Composite materials; Propriétés mécaniques; Bateau de plaisance; Echantillonnage; Dimensionnement; Conception.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-1051.pdf
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Les pêcheries de buccin (Buccinum undatum L. : Gastropoda) du Golfe Normand-Breton. Eléments de gestion de la ressource ArchiMer
Santarelli Chaurand, Leonardo.
The whelk (Buccinum undatum) fisheries in the gulf between Brittany and Normandy have grown quickly over the past ten years. In 1983, 35 potters and 14 dories from Granville harbour and the Blainville maritime station landed 3,900 tonnes of whelk (for a value of 7.5 million francs). In spite of a sharp drop in profitability, the number of fishers is still growing. This study aimed to provide decision-making elements for rational management of the resource : stock abundance, catches per unit effort, mortality due to fishing effort and biological properties. In order to assess the impact of measures to organise the fishing effort on total catches in balance, two predictive models were used: Pella and Tomlinson's generalised production model and Ricker's...
Tipo: Text Palavras-chave: Bio economic modelling; Sampling; Population dynamics; Stock management; Mollusc; Modélisation bioéconomique; Echantillonnage; Dynamique de populations; Gestion de stocks; Mollusque.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/these-1203.pdf
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Les stocks de moules dans le Pertuis Breton en 1989 - Convention Poitou-Charente 1989-1993 ArchiMer
Dardignac-corbeil, Marie-jose.
La biomasse de moules en élevage dans le Pertuis Breton au printemps 1990 a été estimée à 15.500 tonnes avec une précision de 4,7 %. Les observations faites cette année ont montré que la biomasse évolue très rapidement à cette saison du fait de la croissance des moules . Il semblerait qu'il soit préférable d'évaluer le stock en février , époque où il est relativement stable .
Tipo: Text Palavras-chave: Moules; Bouchots; Biomasse; Echantillonnage; Pertuis Breton; Mussels; Biomass; Sampling; Pertuis Breton; Bouchots.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/00045/15587/12989.pdf
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L'ostréiculture sur la côte Est du Cotentin ArchiMer
Jeanneret, Hélène; Kopp, Joel; Joly, Jean-pierre; Moriceau, Jacques; Legagneur, Eric.
Une approche socio-économique a permis de classer en 5 catégories les exploitations conchylicoles de la côte est du Cotentin. Parallèlement, une stratégie d'échantillonnage a été mise au point dans cette zone. Dans chacune des 20 strates, la densité des poches et la composition du stock (naissain , 18 mois, ... ) ont été évaluées, ce qui a permis d'estimer à 12 900 tonnes le stock d'huîtres en élevage en 1989 et 1990.
Tipo: Text Palavras-chave: Ostréiculture; Stocks; Crassostrea gigas; Est Cotentin; Exploitations conchylicoles; Echantillonnage.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/00092/20361/18022.pdf
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Mortalité de Crassostrea gigas dans le bassin de Marennes Oléron. Etude physico chimique du sédiment. Etude du modèle de mortalité "plat-table" de C. gigas dans le bassin de Marennes Oléron. Etude "Dynamo" du projet MOREST ArchiMer
Soletchnik, Patrick; Bouchet, Vincent; Malestroit, Pascal; Seugnet, Jean-luc; Blouin, Frederic; Radford-knoery, Joël; Burgeot, Thierry; Sauriau, Pierre-guy.
In the scope of the study of the "on-bottom/off-bottom" mortality model in the south of the Marennes Oléron Bay, the result of the 2003 multidisciplinary study (Dynamor) appears to be the hypothesis of an acute stress, "ultimate" trigger of the mortality episodes in June. In 2004 we aim to look for the nature of this stress through the physico-chemical analysis of the sediment (Eh, pH, sulphides and ammoniacal nitrogen), the organic matter and chlorophyll load on the surface of the sediment between April and July. Herbicides are also measured in the water column, south of the bay (Seudre), during the same period. A "precocious" (around the first week of June) and "weak" (lower mortality rate on this working site since 1997) mortality peak happens when the...
Tipo: Text Palavras-chave: Bassin Marennes Oléron; Phytobenthos; Mortalité; Crassostrea gigas; Foraminiferes benthiques; Répartition verticale; Sédiment; Huître; Echantillonnage.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/rapport-3383.pdf
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Rationalisation de l'échantillonnage biologique pour l'évaluation des stocks des pêcheries marines en golfe de Gascogne ArchiMer
Pelletier, Dominique; Beucher, Helene; Chevalier, Robert; Laurec, Alain; Alperi, J.; Pereda, P.; Guichet, Roger; Dupouy, Herve; Peronnet, Isabelle.
The aim of the project "rationalization of biological sampling for stock assessment of marine fisheries in the bay of Biscay" is to perform statistical methods and computer programs allowing to test prognoses and diagnoses based on estimates of fishing mortalities, recruitments, yields per recruit, and the "gain-loss" function. The project gathers the laboratories of the community working on the Bay of Biscay fisheries, namely - Santander in Spain (1. E. 0) - La Rochelle and Lorient in France (IFREMER). A descriptive study has been carried out. The prepared documents contain a description of the procedures used to collect the information, by each of the laboratories involved, on: - landings - biological samplings. More comprehensive data have been gathered...
Tipo: Text Palavras-chave: Capture; Marine biology; Fisheries; Megrim; Monk; Hake; Data collection; TAC; Bay of Biscay; Stock assessement; Sampling; Statistics; Capture; Biologie marine; Halieutique; Cardine; Baudroie; Merlu; Collecte de données; TAC; Golfe de Gascogne; Evaluation des stocks; Echantillonnage; Statistiques.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/1991/rapport-3621.pdf
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Relance de l'huître plate, Ostrea edulis. Bilan des travaux réalisés en 1993 ArchiMer
Martin, Anne-genevieve.
A revival program for the European flat oyster Ostrea edulis was initiated in Brittany in 1984 and funded by regional and national agencies. Since then, the research programs were carried out and the 1993 results are presented in this report. Disease status and spat settlement trends are described within each breeding area as weil as advances in genetic research.
Tipo: Text Palavras-chave: Bivalves; Ostrea edulis; Bonamia ostreae; Marteilia refringens; Epidemiologie; Pathologie; Génétique; Echantillonnage; Elevage; Bivalves; Ostrea edulis; Bonamia ostreae; Marteilia refringens; Epidemiology; Pathology; Genetic; Sampling; Breeding.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/00427/53822/54813.pdf
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