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Registros recuperados: 34
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Evaluation de la biomasse de reproducteurs et des recrues du stock de coquille Saint- Jacques de la baie de Saint- Brieuc - Résultats préliminaires ArchiMer
Dao, Jean-claude.
L'importance du déterminisme du recrutement pour la maîtrise des ressources vivantes, par gestion des stocks halieutiques comme par aménagement avec recours à l'aquaculture extensive et au repeuplement, est maintenant une évidence. La coquille Saint-Jacques de la baie de Saint-Brieuc a été retenue pour les enquêtes préparatoires à l'établissement d'un programme sur le sujet et dans ce cadre, il a été jugé fondamental d'apporter une évaluation sur le recrutement et sur la biomasse de reproducteurs.
Tipo: Text Palavras-chave: Coquille Saint-Jacques; Déterminisme du recrutement; Biomasse; Stock; Baie de Saint-Brieuc.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/00016/12706/9628.pdf
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Perspectives d'exploitation des petits bivalves ArchiMer
Berthou, Patrick.
Tipo: Text Palavras-chave: France; Brittany; Bivalvia; Economics; Trade; Conservation; Catching; Stock; Fisheries; Manche Occidentale; Bretagne Sud; Bivalvia; Valorisation; Methode Capture; Gestion Stock; Exploitation.
Ano: 1987 URL: http://archimer.ifremer.fr/doc/1987/rapport-2208.pdf
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Estimation des stocks de moules de gisements naturels dans la baie de Bourgneuf en 1986 ArchiMer
Baud, Jean-pierre; Haure, Joel.
L'estimation de stocks de mollusques non cultivés et plus particulièrement des moules de gisements naturels a été effectuée pour la première fois dans la Baie de Bourgneuf en Novembre 1986. Cette étude a fourni les résultats suivants; le stock total s'élève à 40 068 tonnes de moules de gisement naturel avec une précision de 49%. Pour obtenir cette estimation globale, trois secteurs ont été échantillonnés : la zone du Fain en eau profonde, qui représente 19 930 tonnes de moules (précision de 58%) et deux secteurs situés dans la zone de balancement des marées, à l'ouest du premier secteur qui sont estimés respectivement à 6 172 tonnes (précision 54%) et 3 966 tonnes (précision 186%). Cette étude montre l'importance des gisements naturels de moules dans ce...
Tipo: Text Palavras-chave: Conchyliculture; Biomasse; Stock; Moules; Gisements naturels; Baie de Bourgneuf; Mytilus edulis.
Ano: 1988 URL: http://archimer.ifremer.fr/doc/00047/15874/13295.pdf
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L'ostréiculture sur la côte Ouest du Cotentin ArchiMer
Goulletquer, Philippe; Joly, Jean-pierre; Kopp, Joel; Legagneur, Eric; Moriceau, Jacques; Ruelle, Francois.
L'ostréiculture sur la côte Ouest Cotentin a été étudiée à partir d'estimations des stocks en élevage et de suivis de populations entre 1990 et 1992. A partir de stratégies d'échantillonnages, les stocks en élevage ont été estimés à 33 556 et 35 542 t respectivement en 1990 et 1991. Sur une production normande annuelle totalisant 34 914 tonnes, 53% a été produit sur la côte Ouest Cotentin en 1990. Un modèle global d'aménagement est proposé définissant la relation entre les performances de croissance mesurées, les cheptels en élevage, le niveau d'émersion, et la distance par rapport aux principales sources d'éléments nutritifs terrigènes. Près de 80% de la variabilité du poids final est expliqué par ce modèle régressif destiné à faciliter les décisions...
Tipo: Text Palavras-chave: Crassostrea gigas; Stock; Croissance; Composition biochimique; Aménagement; Cotentin.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/00092/20326/17972.pdf
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Caractérisation biologique et variation des captures de la grande alose (Alosa alosa) par unité d'effort sur le fleuve Adour (Pyrénées Atlantiques, France) ArchiMer
Prouzet, Patrick; Martinet, Jean-pierre; Badia, Jacques.
The study of logbooks from commercial fishermen on the Adour River and commercial samples allowed characterization of the allis shad population (Alosa alosa L.) caught during the period 1988-91. A better knowledge of the influence of hydroclimatic factors (rate of river flow and intensity of tidal coefficient) on the catchability of the species in that never was also obtained. Allis shad are mainly recruited to this fishery from the beginning of April to the end of May: between 78 and 89 % depending on year. Males in the population were on average younger than females. However, at the same age, males were significantly smaller in size and in weight than females. These results reinforce the knowledge already obtained on French stocks in the Loire and...
Tipo: Text Palavras-chave: Alosa alosa; Grande alose ou alose vraie; Clupéidés; Captures; Stock; Pêche; Âge; Débit fluvial; Courant de marée; Atlantique; Alosa alosa; Allis shad; Clupeidae; Catch; Fishing effort; Stock assessment; Age composition; Flow and tidal currents; Atlantic.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/00188/29891/28336.pdf
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La mytiliculture dans la Manche. Biomasses en élevage et croissance de Mytilus edulis L. ArchiMer
Goulletquer, Philippe; Joly, Jean-pierre; Le Gagneur, Eric; Ruelle, Francois.
This report describes the mussel Mytilus edulis sampling stock strategy developed to carry out stock assesments along the French Normandy coastline between 1989 and 1993. The overall totalnetweight reached 13,992 metric tons in 1993 with 27% precision level. Simultaneously, a growth study was carried out on 36 experimental sites to estimate overall variability. Individual total weight varied from 6.6 to 12 g at rearing cycle completion. An empirical management model conceming the Western Cotentin rearing areas was proposed and explained 68% of total weight variance. Based on a stepwise multilinear relationship, the model linked overall growth performance to local stocking density, tidal distribution, and distance from the main runoffs inputs. It aims to...
Tipo: Text Palavras-chave: Mytilus edulis; Manche; Stock; Croissance; Mytilus edulis; Manche; Stocking density; Growth.
Ano: 1995 URL: http://archimer.ifremer.fr/doc/00072/18360/15932.pdf
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Crepidula fornicata L. (mollusque, gastéropode) en baie de Marennes-Oléron : cartographie des fonds par sonar à balayage latéral et estimation du stock ArchiMer
Sauriau, Pierre-guy; Pichocki-seyfried, C; Walker, P; De Montaudouin, Xavier; Palud, Cecile; Heral, Maurice.
Extensive and detailed subtidal ground mapping of the Marennes-Oleron Bay and Fouras-Aix areas was performed with a side-scan sonar. Side-scan sonographs gave a comprehensive view of sedimentological bottom environments and also allowed us to outline locations of grounds colonised by the gastropod mollusc Crepidula fornicata L. with a precise estimate of their surface. A sedimentological map of the centre of the Marennes-Oleron Bay is given, describing spatial organisation of the following four types of sediment: pure mud, fine sand, coarse sand and rocks. Crepidula beds were also recognised on sonographs and were estimated to cover 181 hectares in the Fouras-Aix area and 615 hectares within the Marennes-Oleron Bay. Standard sampling methods were then...
Tipo: Text Palavras-chave: Crepidula fornicata; Cartographic; Stock; Sonar à balayage latéral; Marennes-OlCron; Crepidula fornicata; Mapping; Stock assessment; Side-scan sonar; Marennes-Oleron Bay.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/1998/publication-854.pdf
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Regulating Stock Externalities Under Uncertainty AgEcon
Newell, Richard G.; Pizer, William A..
Using a simple analytical model incorporating benefits of a stock, costs of adjusting the stock, and uncertainty in costs, we uncover several important principles governing the choice of price-based policies (e.g., taxes) relative to quantity-based policies (e.g., tradable permits) for controlling stock externalities. Applied to the problem of greenhouse gases and climate change, we find that a price-based instrument generates several times the expected net benefits of a quantity instrument. As in Weitzman (1974), the relative slopes of the marginal benefits and costs of controlling the externality continue to be critical determinants of the efficiency of prices relative to quantities, with flatter marginal benefits and steeper marginal costs favoring...
Tipo: Working or Discussion Paper Palavras-chave: Stock; Externality; Regulation; Policy; Uncertainty; Price; Quantity; Tax; Tradable permit; Pollution; Climate change; Greenhouse Gas; Instrument choice; Risk and Uncertainty; Q28; D81; C61.
Ano: 2000 URL: http://purl.umn.edu/10471
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ESTUDIO POBLACIONAL DEL RECURSO ANCHOVETA (ENGRAULIS RINGENS JENYNS 1842) (CLUPEIFORMES, ENGRAULIDAE), MEDIANTE ANALISIS DE ADN Gayana
Ferrada,Sandra; Hernández,Klaudia; Montoya,R.; Galleguillos,Ricardo.
Se estudió la variabilidad de 2 genes nucleares, el intrón 4/5 del gen de Calmodulina (CaM) por amplificación PCR y la región ITS (Internal Transcribed Spacers) del ADNr, por PCR y digestión en 139 ejemplares de E. ringens provenientes de las costas de Iquique (20°13'S; 70°09'W) y Talcahuano (36°41'S; 73°06'W). Para CaM se identificaron 8 genotipos en las muestras de Talcahuano y 7 en Iquique, presentando 1 a 3 fragmentos amplificados de 550 a 1.100 pb. En la digestión del fragmento ITS amplificado, sólo la endonucleasa TaqªI detectó 3 diferentes genotipos, 2 presentes en Talcahuano y 3 en Iquique. Se discuten las frecuencias observadas para cada gen y área de estudio. Los resultados llevan a confirmar la existencia de un solo stock, desde un punto de...
Tipo: Journal article Palavras-chave: Engraulis ringens; ITS; CaM; Variabilidad genética; Stock.
Ano: 2002 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200022
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Estimation du stock de moules sur bouchots en baie du Mont Saint-Michel ArchiMer
Gerard, Denis.
The quantity of mussels cultivated on wooden poles called « bouchots », in Mont Saint-Michel bay, has been estimated in april 2002, by volume, number and weight. To do so, a sampling strategy has been conceived, operated and then optimized, taking into account the spatial distribution of this stock and the material and human constraints (especially the amount of persons and working days available). The sampling plan uses procedures of stratification, degrees, regression, so as to reach the optimum precision related to cost. The operation took a great advantage of the efficient help of mussel farmers. During the first day, the task consisted to estimate the number and position of poles occupied by mussels, with the help of 5 persons on boat. The following 2...
Tipo: Text Palavras-chave: Mont Saint Michel; Sampling; Biomass; Stock; Mussels; Mont Saint Michel; Échantillonnage; Biomasse; Bouchot; Stock; Moules.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/2002/rapport-5304.pdf
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Rapport d'activités 2003 de la station Ifremer de la Tremblade ArchiMer
Shellfish research laboratory in Pertuis Charentais (France) present the main results concerning its activity during the year 2003. Water quality monitoring, growth, mortality and condition indices are performed on oysters ansd mussels all along the year. Shellfich stock assessment and its spatial distribution, summer mortalities events are the main research topics developped
Tipo: Text Palavras-chave: Stock; Mortality; Growth; Hydrology; Mussel culture; Stock; Mortalité; Croissance Organisme; Hydrologie; Conchyliculture.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/rapport-333.pdf
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Etude et modélisation de la dynamique des populations de bivalves en élevage (Crassostrea gigas et Mytilus galloprovincialis) dans le bassin de Thau (Méditerranée, France) et des ascidies solitaires associées ArchiMer
Gangnery, Aline.
The total standing stock of bivalves cultured in Thau Lagoon (France) that is mainly constituted of the Pacific oyster, Crassostrea gigas, and the Mediterranean mussel, Mytilus galloprovincialis, vary between 14,000 and 20,000 tons within a year. These variations were attributed to the rearing cycle of molluscs in the lagoon but also to their growth performances. Oysters cultured in the Thau Lagoon presented the best growth rate ever reported whereas trophic conditions are low : mean concentrations in organic particulate matter and total chlorophyll a averaged 1 mg.l-1 and 1.2 µg.l-1, respectively. The development of a growth model shows that temporal pattern (i.e. seasonality) of bivalve growth is explained by water temperature and spatial pattern is...
Tipo: Text Palavras-chave: Lagoon ecosystem; Resource management; Rearing strategies; Production; Standing stock; Hydrobiology; Growth; Shellfish culture; Ascidiella aspersa; Mussel; Oyster; Ecosystème lagunaire; Gestion des ressources; Stratégies d'élevage; Production; Stock; Hydrobiologie; Croissance; Conchyliculture; Ascidiella aspersa; Moule; Huître.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/these-102.pdf
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Evaluation du stock de coquilles Saint-Jacques de la Baie de Seine et du Proche Extérieur. COMOR 32 (8-23 juillet 2002) ArchiMer
Foucher, Eric.
Scientific scallop surveys called COMOR are carried out in the bay of Seine since 1976. Results are used by fishermen’ associations and by fishing administration to lead management measures. In this report, the scientific results of the survey COMOR 32 realised in July 2002 are described. Abundance and growth indices for scallop, by age and area, are presented. During these surveys, data about most abundant benthic species are also collected since 1998. A first assessment with five years data is made here. A global descriptive analysis is undertaken about all the species present on scallops grounds. A special zoom is applied on both species whitch could be exploited (whelk Buccinum undatum and queen scallop Aequipecten opercularis) and three competitive...
Tipo: Text Palavras-chave: Coquille Saint-Jacques; Pecten maximus; Baie de Seine; Évaluation directe; Stock; Diagnostic; Scallop survey; Pecten maximus; Bay of Seine; Assessment; Stock.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00341/45178/44575.pdf
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Влияние температуры воды на выживание молоди и формирование промыслового запаса черноморского шпрота Sprattus sprattus phalericus (Risso) (Pisces: Clupeidae) IBSS Repository
Зуев, Г. В.; Репетин, Л. Н.; Гуцал, Д. К.; Мельникова, Е. Б.; Пустоварова, Н. И..
Изучали влияние температуры воды на выживание ранних возрастных стадий черноморского шпрота и формирование величины его промыслового запаса. Для оценки выживания молоди разных поколений (годовых классов) использовали относительную численность в популяции годовиков. На примере четырех поколений (1998 – 1999; 1999 – 2000; 2000 – 2001 и 2001 – 2002 гг.) установлена тесная связь между относительной численностью годовиков и средней температурой воды в феврале предыдущего года. Коэффициент корреляции равен +0.98. Между величиной промыслового запаса, основу которого составляли двухгодовики, и температурой воды на ранних стадиях их развития достоверной связи не обнаружено, что дает основание рассматривать урожайность поколений в качестве основного фактора,...
Tipo: Journal Contribution Palavras-chave: Черноморский шпрот; Температура воды; Выживание; Промысловый запас; Поколение; Улов; Black Sea sprat; Water temperature; Survival rate; Stock; Age generation; Catch Fish catch statistics Water temperature Water temperature http://aims.fao.org/aos/agrovoc/c_16063.
Ano: 2004 URL: http://repository.ibss.org.ua/dspace/handle/99011/55
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Estimation du stock d'huîtres creuses Crassostrea gigas, en élevage en Baie de Cancale, en octobre 2002 ArchiMer
Mazurie, Joseph; Bouget, Jean-francois.
in order to estimate the carrying capacity of Mont Saint-Michel Bay, the stock (or biomass) of cupped oysters, Crassostrea gigas, cultivated intertidally, in Cancale Bay, has been estimated in october 2002. Aerial photographs, at 2 scales (1/10 000 and 1/2000), provided by the mollusc farmers union, have been used to estimate the cumulative length of surelevaged trestles (« tables ») and the occupation rate by oyster bags. A field survey, between the 7th and 9th of october 2002, has been conducted by Ifremer with the help of « Lycée Maritime de Saint-Malo », on 40 sampled stations : 3 subsample bags per station were examined (counts and weights of different age-class oysters). 309 ha out of 333 leased ha were considered exploited (after elimination of...
Tipo: Text Palavras-chave: Baie du Mont Saint Michel; Cancale; Crassostrea gigas; Cupped oysters; Production; Biomass; Baie du Mont Saint Michel; Cancale; Crassostrea gigas; Huîtres creuses; Production; Biomasse; Stock.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/rapport-5296.pdf
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Estimation du stock de coques (Cerastoderma edule) élevé dans le Traict du Croisic en 2001. ArchiMer
Haure, Joel; Papin, Mathias; Palvadeau, Hubert; Sauriau, Pierre-guy; Nourry, Max; Penisson, Christian; Dupuy, Beatrice; Martin, Jean-louis.
Le Traict du Croisic représente une surface de 650 hectares dont 180 hectares sont dédiés à la conchyliculture. Bien que divers types d’élevage soient pratiqués (huîtres creuses Crassostrea gigas, moules Mytilus edulis, palourdes Venerupis spp.), l’élevage de la coque Cerastoderma edule représente, à lui seul, 140 hectares de concessions soit 76 % de la surface allouée à l’exploitation conchylicole. La production de coques est de 1200 à 2000 tonnes par an, ce qui fait du Traict le premier centre d’élevage et le deuxième producteur français après la baie de Somme où 2500 tonnes par an sont extraites de l’exploitation des gisements naturels (Bonnel, 1986). Il existe peu d’études scientifiques sur l'élevage de la coque dans le Traict du Croisic. Les...
Tipo: Text Palavras-chave: Crastoderma edule; Coque; Conchyliculture; Stock; Biomasse.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/00326/43765/43322.pdf
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Étude préparatoire a une reconquête des niveaux de ressource en langouste royale (Palinurus elephas) en mer d'Iroise ArchiMer
Latrouite, Daniel; Lazure, Pascal.
The study conducted in the framework of an agreement between Ifremer and the Local fisheries committee at Audierne is part of a project to restore spiny lobster Palinurus elephas stock levels in the Iroise Sea. It is supported by professional fishermen from Finistère and by the Regional fisheries committee of Brittany. After a brief review of the way lobster stocks are managed worldwide, followed by the major biological and ecological features of red lobster and the state of fisheries in Europe and North Africa, the very poor state of the resource along French coast is borne out by the statistics of landings. Various scenarios (not alternatives) to promote the rebuilding of the biomass are suggested: minimum landing size increase, seasonal closure of...
Tipo: Text Palavras-chave: Phyllosoma; Iroise; Stock; Rebuilding; Overfishing; Palinurus elephas; Red lobster; Phyllosomes; Iroise; Stock; Reconstitution; Surexploitation; Palinurus elephas; Langouste rouge.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/rapport-1198.pdf
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THE QUESTIONABLE NECESSITY OF CHANGING MAIZE INTERVENTION AgEcon
Jancsok, Zsuzsanna; Kato, Norbert; Nogradi, J.; Cseke, Z..
The EU took clear steps to suppress and abandon the intervention of maize in 2006. Originally the measure should have been revised in the course of the “Health Check”. But the European Commission (EC) rendered the minimal quality requirement for maize stricter in the intervention period starting 1 November 2006. Later the EC proposed to finish the intervention of maize. According to that decision the intervention of maize exists in the marketing year of 2007/08 and 2008/09 with a quantity limitation but it finishes in the marketing year of 2009/10. The EC argues for the abandonment of maize intervention, because, intervention stocks of cereals have increased significantly after the accession of the 10 new member states (EU-10), and the balance of the maize...
Tipo: Journal Article Palavras-chave: Cereal; Intervention; Maize; Stock; Agricultural and Food Policy; Agricultural Finance.
Ano: 2008 URL: http://purl.umn.edu/47547
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Популяционная структура и условия формирования промыслового запаса хамсы Engraulis encrasicolus у побережья Крыма в осенне-зимний сезон 200/2008 гг. IBSS Repository
Зуев, Г. В.; Гуцал, Д. К.; Репетин, Л. Н.; Салехова, Л. П.; Мельникова, Е. Б.; Бондарев, В. А.; Мурзин, Ю. Л..
С помощью индекса отолитов установлена принадлежность хамсы, зимовавшей в 2007/2008 гг. у юго-западного и южного побережья Крыма, к черноморской популяции. Проанализирована динамика размерно-возрастной и половой структуры популяции в период зимовки, а также динамика промысла. Обсуждаются гидрометеорологические факторы, обусловившие массовую осеннюю миграцию хамсы к черноморскому побережью Крыма.
Tipo: Journal Contribution Palavras-chave: Хамса; Улов; Запас; Популяционная структура; Отолит; Чёрное море; Anchovy; Catch; Stock; Population structure; Otolith; Black Sea; Популяційна структура; Отоліт; Чорне море.
Ano: 2009 URL: http://repository.ibss.org.ua/dspace/handle/99011/841
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Dinâmica populacional da matrinxã Brycon amazonicus (Characidae) na Amazônia Central Rev. Bras. Zool.
Santos Filho,Leocy C. dos; Batista,Vandick da S..
The matrinxã, Brycon amazonicus (Spix & Agassiz, 1829) is one of the most important fishery resources of the Amazonas state. Its population dynamics in Central Amazon was analyzed based on total landing and biometry data registered in the main landing port of Manaus, between 1994 and 2002. Growth and mortality rates were estimated separately for the rivers Purus, Madeira and Solimões. Differences in size structure and growth curves suggest that different population units exist among these rivers, requiring individualized evaluation and fisheries management strategies. The analysis of the yield per recruit does not indicate overexploitation. However, the highest relative exploitation rate was observed in the Madeira river. The suggested management...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fisheries; Growth; Mortality; Stock.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000200001
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