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Registros recuperados: 56
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Analyse des ressources et des caractéristiques individuelles du stock d'oursin Paracentrotus lividus (Lamarck, 1816) du territoire 64 ArchiMer
De Casamajor, Marie-noelle; Mahias, Jeremy; Bru, Noelle; Caill-milly, Nathalie.
A spatial sampling was carried out for stock assessment of sea urchin P. lividus throughout the Basque coast. A sampling, over the year, was conducted to study the reproductive cycle. This work took place over 2013 and 2014. Reproduction occurs once in spring, between May and August 2014. Among factors affecting the release of eggs, salinity, temperature and hydrodynamics show a significant inter-annual variability in the Basque coast. Thus, the period set in 2014, may fluctuate between years. For the stock, the results showed that 11.85 (+/-0.32) million individuals of harvestable biomass for 724 tones (+/- 137). Stock is spread over the entire surveyed area density and biomass decrease rapidly with depth, individuals are mainly located between 0 and 5 m....
Tipo: Text Palavras-chave: Oursin commun; Stock; Biomasse; Reproduction; Côte basque; Conditions environnementales; Sea urchin; Stock; Biomass; Reproduction; Basque coast; Environmental conditions.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00218/32889/31373.pdf
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Approche de la capacité trophique d'un écosystème conchylicole ArchiMer
Heral, Maurice; Deslous-paoli, Jean-marc; Prou, Jean.
After a short bibliographical study of the different approaches for determination of the trophic capacity of a bay for molluscs culture, the authors, with a global mode, show the relations between the growth performance of the oysters Crassostrea gigas in relation with the cultivated stocks. The volumes of consumed and assimilated food are calculated for the stocks in relation with the incoming volumes of water in the bay and the residence time for neap tide and spring tide. The authors find a decrease of growth rate in relation with the volume of consumed food. When it is above 60% and when the volume of assimilated food is above 20%, there is a large decrease of the growth of oysters.
Tipo: Text Palavras-chave: Crassostrea gigas; Oysters; Stock assessment; Models; Food consumption; Growth; Biomass; Stock cultivé; Biomasse; Croissance; Modèle; Crassostrea gigas; Huîtres; Capacité trophique.
Ano: 1988 URL: http://archimer.ifremer.fr/doc/1988/acte-3834.PDF
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BIOENERGIE AS A SOURCE OF INCOME OF AGRICULTURAL ENTERPRISES AgEcon
Makarchuk, Oksana; Hockmann, Heinrich; Lissitsa, Alexej.
Enterprise activity is based on maximization of profit to increase the volume of own capital, to expand manufacture and to guarantee the earning of profit for the long-term period. Therefore everyone searches for new sources of the income by means of which it is possible to maximize cost of the made product. One of new sources of the income in agriculture is a cultivation of agricultural crops for the energy, heat, fuel (biofuel) manufacture. In this "discussion paper" the market is examined for biofuel, as well as their competitiveness is analyzed in comparison to mineral fuels. Germany takes the lead positions on manufacture and use of biofuel among the countries of the European Union and Ukraine has a big potential on the agricultural commodities market...
Tipo: Working or Discussion Paper Palavras-chave: Биотопливо; Биоэтанол; Биомасса; Возобновляемые источники энергии; Конкурентоспособность; Спрос и предложение.Biokraftstoff; Bioethanol; Biomasse; Erneubare Energien; Wettbewerbsfähigkeit; Angebot und Nachfrage.Biofuel; Bioethanol; Biomass; Renewed energy sources; Competitiveness; Supply and demand.; Agribusiness; Environmental Economics and Policy; Farm Management; Productivity Analysis; Resource /Energy Economics and Policy; Q12; Q27.
Ano: 2007 URL: http://purl.umn.edu/91735
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Biomasse et production primaire du phytoplancton et du microphytobenthos de deux biotopes sableux (Golfe de Fos, France) ArchiMer
Plante-cuny, Marie-reine; Bodoy, Alain.
The primary production (phytoplankton and microphytobenthos) of a coastaL shallow water ecosystem (0.5 m) was investigated in two sandy areas, differing by their wave exposure. The physical and chemical parameters, the functional chlorophyll and pheopigments as well as the primary production were measured monthly, throughout a two-year study. The bivalve Ruditapes decussatus was the dominant species in the sheltered station (RD), whereas Donax trlmcu/us inhabited the other station (DT) which was exposed to the open-sea waves. Microphytic biomasses were determined after extracting chlorophyll a and pheopigments in 90% acetone. by spectrophotometric measurements before and after acidification. Gross hourly primary production was estimated by measuring the...
Tipo: Text Palavras-chave: Biomasse; Production primaire; Phytoplancton; Microphytobenthos; Mediterranee; Biomass; Primary production; Phytoplancton; Microphytobenthos; Mediterranean.
Ano: 1987 URL: http://archimer.ifremer.fr/doc/1987/publication-2870.pdf
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Campagne d'évaluation du stock de palourdes du bassin d'Arcachon - Année 2006 ArchiMer
Caill-milly, Nathalie; Duclercq, Benoit; Morandeau, Gilles.
Between 1980 and 1986, some Arcachon oyster farmers took up breeding the Japanese clam on the foreshore (Robert et Deltreil, 1990). This production was short lived. The steep fall in prices due to economic competition from Spain, Portugal, Italy and Tunisia, predator action such as the trigger fish (Popovsky et al., 1999), added to the significant amount of mortality that occurred in the summer and autumn of 1992 that affected two-thirds of the total stock, led to clam farming being abandoned at the end of the 1980s. In the Arcachon basin, the Japanese clam (Ruditapes philippinarum) population, now natural to the area, has found favourable conditions for development and is expanding rapidly there. This species has been supplanting the local species...
Tipo: Text Palavras-chave: Ruditapes philippinarum; Veneridae; Popluation structure; Biomass; Stock assessment; Arcachon Bassin; Veneridae; Ruditapes Philippinarum; Bivalvia; Mollusca; Structure Population; Biomasse; Abondance; Evaluation Stock.
Ano: 2006 URL: https://archimer.ifremer.fr/doc/2006/rapport-2218.pdf
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Caractéristiques du feutrage algal des récifs coralliens de Polynésie française soumis à différentes intensités de bioérosion ArchiMer
Le Bris, S; Le Campion-alsumard, T; Romano, Jc.
This study deals with the colonisation of experimental Porites blocks by epilithic and endolithic algal community in two atoll lagoons and two high-island lagoons in French Polynesia, exposed to different environmental conditions during a 5-year period. A qualitative analysis of the community (cyanobacteria and micro-algae) was carried out, and the relationship between the epilithic and endolithic strata observed. HPLC analysis of chlorophyll pigments was used to quantitatively determine the plant biomass, which was then compared to that of the algal turf of neighbouring reefs. The results show that these blocks are colonised according to two factors: the reef structure (atoll or high-island) and the degree of human disturbance. The epilithic and...
Tipo: Text Palavras-chave: Récif corallien; Feutrage algal épilithe et endolithe; Biomasse; Bioérosion; Eutrophisation; Coral reef; Epilithic and endolothic algal community biomass; Bioerosion; Eutrophication.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00325/43652/43241.pdf
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Diversification de la production : culture de palourdes sur estran, premiers résultats 1984 semis expérimentaux 1985 ArchiMer
Goulletquer, Philippe.
The study of foreshore clam culture with three immersion levels (40, 50, 70) has demonstrated a backlog in clam growth on the highest level, as well as a reproduction backlog and a weakened physical state during winter for populations unimmersed with a tide coefficient of 40-50. But the available areas for these cultures (areas that have not been allocated to oyster or mussel culture) are those unimmersed with those tide coefficients. Thus, it is not advised to extend the surfaces granted in the Marennes-Oléron basin, but on the contrary to use those granted to oyster culture but which are not exploited. This solution was the one accepted for the 1985 experimental seedings conducted over a 3 000 m² area on the Isles of Ré and Oléron and in Marennes, on...
Tipo: Text Palavras-chave: Marennes Oléron; Mortalité; Biomasse; Croissance pondérale; Croissance linéaire; Estran; Elevage; Palourdes.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/rapport-3839.PDF
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Diversification de la production : culture de palourdes sur estran, résultats années 84-85 ArchiMer
Goulletquer, Philippe; Prou, Jean; Heral, Maurice.
Following the development of net protection techniques (1980), Japanese clam Ruditapes philippinarum farms develop in the ponds of Charente-Maritime. The county production for 1984 is about 100 tonnes, for a turnover of 4.5 Million Francs. To this day, farmers cultivating clams in ponds over a full cycle get better growth results during the first year. The size of 24 mm is obtained with a density of 200 individuals per square metre. However, due to the type of water input in ponds and to the limited primary production developing in the latter, it appears that biomasses in farms during the second year should not be greater than 0.5 to 1 kg per m² (30 to 50 clams per m²). Thus, the development of clam culture in marsh areas comes to a halt, as farmers are...
Tipo: Text Palavras-chave: Marennes Oléron; Mortalité; Biomasse; Croissance pondérale; Croissance linéaire; Biométrie; Elevage; Ruditapes philippinarum; Palourdes.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/rapport-3840.PDF
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Dynamiques des productions et des biomasses des huîtres creuses cultivées (Crassostrea angulata et Crassostrea gigas) dans le bassin de Marennes-Oléron depuis un siècle ArchiMer
Heral, Maurice; Deslous-paoli, Jean-marc; Prou, Jean.
The evolution of the production of cupped oysters is estimated on a century (1885-1985) with three different sources of data. The total biomass in culture is calculated from productions by knowing regularly the growing rate and the mortality rate of the populations of oysters. It appears that the efficiencies of the culture (P/B) decrease when the stock increase. The production reaches a plateau maximum of 40 000 tons whereas the stock goes on to growth up to 200 000 tons. This plateau correspond to the maximal capacity of production of the ecosystem limited by the trophic capacities of the bay. This work shows that without management of the cultivated oysters, the stocks tend to exceed the minimal biomass which is necessary to reach the maximal potential...
Tipo: Text Palavras-chave: Biomasse; Marennes Oléron; Huîtres; Crassostrea angulata; Crassostrea gigas.
Ano: 1986 URL: http://archimer.ifremer.fr/doc/1986/acte-2965.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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Eléments nutritifs limitant la biomasse phytoplanctonique d'une lagune tropicale de Côte d'Ivoire. Comparaison des méthodes d'estimation ArchiMer
Dufour, P.; Cremoux, Jl.; Slepoukha, M..
"In vitro" enrichment experiments on natural populations have been used to determine the nutrients controlling the potential biomass of phytoplancton in the Ebrié coastal lagoon. The limiting nutrients were generally nitrogen, phosphorus and carbon, in this order ; in three cases out of eleven, P and N act simultaneously ; in an extreme eutrophication case, N, P and C were all limiting. No effect was observed following addition of metals, vitamins or chelators. The limitations deduced from the enrichment experiments show a. good agreement with the elementary composition of the external medium ; in waters potentially limited by N alone, the dissolved inorganic nutrients have a N : P ratio lower than 25. The agreement is poorer when the sestonic N : P ratio...
Tipo: Text Palavras-chave: Lagune; Estuaire; Zone tropicale; Phytoplancton; Biomasse; Eléments limitants; Tests biologiques; Composition chimique; Coastal lagoon; Estuary tropical zone; Phytoplankton; Biomass; Limiting nutrients; Bioassay; Chemlcal composition.
Ano: 1979 URL: http://archimer.ifremer.fr/doc/00306/41689/40898.pdf
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Elevage de copepodes harpacticoïdes (Tisbe holothuriae) en cycle complet. Rôle des facteurs température et nutrition ArchiMer
Gaudy, R.; Guerin, J.p..
Following are results obtained in our laboratory during breeding expe­riments with an harpacticoid copepod, Tisbe holothuriae. In small size volumes (200 ml), the potential production appears to be higher when an artificial compound food of animal substances is used instead of a vegetal diet. In medium volume experiments (100 l) the production is related to the surface available for animals in breeding tanks, Breeding in complete cycles can be obtained using various foods, but the quality of diet may markedly affect the characteristics of the vital cycle, such as the length of the fertility period and fecundity. Temperature has a cru­cial effect, chiefly on dynamic preoccesses, that is to say, developmental rate and average generation time. With different...
Tipo: Text Palavras-chave: Production; Dynamique des populations; Biomasse; Composition chimique élémentaire; Bilan énergétique; Copépodes harparcticoïdes; Production; Population dynamic; Biomass; Chemical elementary composition; Energy balance; Hapacticoïd copepods.
Ano: 1979 URL: http://archimer.ifremer.fr/doc/00306/41672/40881.pdf
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Elevage intensif de la palourde japonaise Ruditapes philippinarum dans les marais atlantiques: faisabilité biologique ArchiMer
Baud, Jean-pierre; Glize, Philippe; Haure, Joel; Garnier, Jacqueline.
Dans un élevage Intensif en claires expérimentales de palourdes japonaises semées à la taille de 28 mm et aux densités de 100, 200 et 300/m2, différentes rations alimentaires de la diatomée Skeletonema costatum. cultivée à partir d'eau salée souterraine, ont été testées de mars à novembre 1988. Pour la densité 100/m2, le taux de croissance n'est pas significativement différent avec des concentrations de pigment dans l'eau injectée comprises entre 31 et 126 µg.l(1) de Chia. Toutefois celui-ci est 1,5 fois supérieur à celui observé dans la claire témoin. Avec 1.8 kg.m-2 la biomasse finale représente 2 fois la charge récoltée dans la claire extensive. Après analyse, la densité de 300/m2 semble être le meilleur compromis pour l'élevage intensif même si la...
Tipo: Text Palavras-chave: Aquaculture intensive; Palourde japonaise; Ruditapes philippinarum; Marais maritime; Zootechnie; Densité; Croissance; Biomasse; Production; Rendement.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/00048/15885/13307.pdf
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Estimation de la biomasse d'huîtres Crassostrea gigas en élevage dans le bassin d'Arcachon. Été 1985. ArchiMer
Maurer, Daniele; Borel, Michel; Dreno, Jean-paul.
L'élaboration d'un modèle de gestion d'un bassin conchylicole nécessite, en particulier, la connaissance de l’évolution des stocks d'huîtres d'une année à l'autre afin d'en apprécier l'influence éventuelle sur le rendement. Le présent travail décrit la méthodologie utilisée et les résultats obtenus au cours de la première estimation du stock d'huîtres Crassostrea gigas en élevage dans le bassin d'Arcachon en 1985. Cette estimation nécessite l'utilisation simultanée de photographies aériennes (évaluation de la surface réellement exploitée ) et de sondages-terrain (évaluation de la biomasse par unité de surface). Ces derniers ont également permis de valider les résultats obtenus par photographie. En 1985, le taux d'exploitation variait, selon la zone...
Tipo: Text Palavras-chave: Crassostrea gigas; Biomasse; Bassin d'Arcachon; Crassostrea gigas; Biomass; Bay of Arcachon.
Ano: 1987 URL: http://archimer.ifremer.fr/doc/00102/21342/18965.pdf
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Estimation de la biomasse d'huîtres Crassostrea gigas en élevage dans le bassin d'Arcachon. Etés 1986 et 1987 ArchiMer
Maurer, Daniele; Parache, Alain; Dreno, Jean-paul.
Afin d ' améliorer la précision des résultats et depuis 1986, quelques modifications ont été apportées à la stratégie d'échantillonnage qui avait été adoptée en 1985 : - prise en compte de la structure en âge de l a population, en différenciant les huîtres âgées de 1 an de celles d'âge supérieur, - traitement séparé des poches et des collecteurs pour l'élevage en sur élevé . Au cours des trois années , le stock d'huîtres en élevage est resté relativement stable : 1985 37 996 t ± 1 970 t précision 5,1% 1986 37 835 t ± 4 196 t précision 11,1% 1987 39 079 t i 3 350 t précision 8,6% avec environ 80% représenté par la culture à plat. Cependant, il est apparu que les différentes variables estimées et leur précision variaient d'une année à l 'autre en liaison...
Tipo: Text Palavras-chave: Crassostrea gigas; Biomasse; Bassin d'Arcachon.
Ano: 1988 URL: http://archimer.ifremer.fr/doc/00430/54141/55471.pdf
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Estimation de la biomasse d'huîtres creuses Crassostrea gigas en élevage le long de la côte Est du Cotentin en 1988 ArchiMer
Kopp, Joel; Joly, Jean-pierre.
Ce rapport présente l'étude de la répartition géographique de stocks en élevage, la stratification des zones concédées, l'évaluation des stocks (huîtres et moules) et composition en taille (huîtres) et la typologie des différentes parcs et des différentes entreprises.
Tipo: Text Palavras-chave: Estimation stocks; Biomasse; Répartition géographique; Typologie.
Ano: 1989 URL: http://archimer.ifremer.fr/doc/00065/17608/15131.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 de stocks d'huîtres sauvages sur les zones concédées de la partie vendéenne de la Baie de Bourgneuf en 2003 ArchiMer
Martin, Jean-louis; Haure, Joel; Dupuy, Beatrice; Nourry, Max; Palvadeau, Hubert; Papin, Mathias; Penisson, Christian; Thouard, Emmanuel.
Au cours des dernières années, les résultats du réseau REMORA montrent un déficit de croissance des huîtres en baie de Bourgneuf par rapport à la moyenne nationale. Ce déficit de croissance s'accentue particulièrement en 2000 et se poursuit en 2002. L'une des hypothèses pouvant être mise en avant pour expliquer les causes de ce manque de croissance est la biomasse accrue des organismes filtreurs cultivés ou non: huîtres, moules, crépidules. Afin d'avoir une vision globale du fonctionnement de l'écosystème de la baie, il est nécessaire d'étudier l'importance relative de ces différents stocks de coquillages. Plusieurs études ont été réalisées en 2002 : Creocean et le Crema ont estimé la biomasse de crépidules dans la partie subtidal de la baie à environ 90...
Tipo: Text Palavras-chave: Huître creuse; Crassostrea gigas; Estimation de stock; Biomasse; Baie de Bourgneuf.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/00048/15878/13300.pdf
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Estimation des biomasses de moules (Mytilus edulis L.) en élevage dans les bouchots du Pertuis Breton - Evolution entre 1988 et 1993 ArchiMer
Dardignac-corbeil, Marie-jose.
The biomass of the cultivated mussels has been estimated every year in the Pertuis Breton dulring the period 1988-1993. The method used is first recalled, then the question of the biomass trends during spring -i.e. during the sampling period- is discussed. Based on the results, it appears that the mussel volume starts decreasing in 1990 to reach a minimum in 1991. A slight increase is observed in 1992 but no further improvement in 1993. The factors possibly related to this evolution are finally discussed.
Tipo: Text Palavras-chave: Pertuis Breton; Mytilus edulis; Bouchots; Biomasse; Pertuis Breton; Mytilus edulis; Bouchots; Biomass.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/00045/15586/12988.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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