Consulta: subjectFacets:"Stocks"
Registros recuperados: 37
Data/hora: 01/06/2024 01:06:23

Estimation des stocks d'huître japonaise en élevage en 1988, dans le bassin de Marennes-Oléron et aspects méthodologiques
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Caryo, Chrystelle.
L'estimation des stocks d'huîtres en élevage dans le bassin de Marennes-Oléron réalisée en 1988 est la cinquième opération annuelle consécutive de ce type. A cette occasion, une comparaison a été réalisée entre deux méthodes de traitement des données de surface ou de longueur d'installation à partir des couvertures photographiques aériennes au 1/10 000ème (surfaces en exploitation) et au 1/1 000ème (taux d'occupation des surfaces en exploitation). Les principaux résultats obtenus lors de cette étude montrent que par rapport à l'année précédente, on constate une relative stabilité des surfaces exploitées. Celles-ci sont en légère régression pour l'élevage à plat, et pratiquement inchangées pour l'élevage en surélévation. Par contre, les densités d'élevage...
Tipo: Text
Palavras-chave: Ostréiculture; Huître japonaise; Crassostrea gigas; Bassin de Marennes-Oléron; Stocks; Surfaces exploitées; Densités; Biomasse; Méthodologie.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/00105/21654/19235.pdf

Stock assesments of the non-cultivated molluscs in the oyster culture area of Marennes Oleron
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Sauriau, Pierre-guy.
A quantitative sampling was made on the non-cultivated molluscs of the soft bottom macrofauna in the bay of Marennes-Oleron. A stratified random sampling, including an optimal allocation strategy. provided adequate data to estimate abundance and biomass (total weight. dry weight and ash-free-dry weight) of each molluscan species. The main stratification factors were respectively the bathymetric levels. the different types of sediment and the differences between natural, oyster-free mud flats and cultivated areas. A Smith Mc-Intyre grab was used to sample the subtidal, shallow areas and the tidal flats as well. The total number of sampling stations was 370. The final estimation of the total weight of benthic molluscs was 14,400  ± 3,000 tons (at 95 %...
Tipo: Text
Palavras-chave: Marennes Oleron; Non cultivated benthic molluscs; Biomass; Stock assessments; Stratrification; Sampling; Marennes Oléron; Molluques benthiques non cultivés; Biomasse; Stocks; Stratification; Echantillonnage.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/1987/publication-2867.pdf

L'élevage de l'huître creuse à Marennes-Oléron en 1987 : Estimation des stocks cultivés
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Bodoy, Alain; Geairon, Philippe.
Le bassin de Marennes-Oléron est le premier centre ostréicole de France, avec un stock de 93 700 tonnes en août 1987. L'opération d'échantillonnage a montré que ce chiffre comprenait 36 500 tonnes pour l'élevage à plat, 33 000 tonnes pour la première phase d'élevage sur tables, qui concerne l'élevage sur collecteurs de captage et 24 200 tonnes pour la phase finale représentée par l'élevage en poche. Le niveau du stock est en augmentation constante depuis 1984. L'importance pondérale de chaque classe d'âge est susceptible de fluctuer très largement puisque des huîtres âgées de 1 an représentaient 4 400 tonnes en 1987, alors que la classe d'âge correspondante représentait 17 000 tonnes en 1986. Ceci est dû aux variations annuelles du captage. Une méthode...
Tipo: Text
Palavras-chave: Ostréiculture; Stocks; Captage; Croissance; Production; Huîtres creuses; Crassostrea gigas; Marennes Oléron; Charente Maritime.
Ano: 1988
URL: http://archimer.ifremer.fr/doc/00014/12480/9326.pdf

A methology for the stocks assessments of cultivated oysters among along the French Atlantic coasts
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Bacher, Cedric; Baud, Jean-pierre; Bodoy, Alain; Deslous-paoli, Jean-marc; Dreno, Jean-paul; Heral, Maurice; Maurer, Daniele; Prou, Jean.
An assessment of the reared stocks of the Pacific oyster (Crassostrea gigas ) has been recently conducted on the major French areas of molluscs culture. The methodology proposed included both estimates of densities obtained by subsampling in the field, and aerial photographs which covered the cultivated, intertidal area. The size and the number of samples were designed to reach a precision of 10% on the final assessment in each area. The field work consisted in weighing and counting the oyster in unit areas of 0.5 m2 for the bottom culture or in trays or bags, for the off bottom technique. These results give a better knowledge of the technique evolution and of the general structures in the cultivated areas.
Tipo: Text
Palavras-chave: Modeling; Estimation; Stocks; Crassostrea gigas; Oysters.
Ano: 1986
URL: http://archimer.ifremer.fr/doc/1986/acte-2864.pdf

Estimation des stocks d'huîtres sauvages sur les zones non concédées de la partie vendéenne de la Baie de Bourgneuf en 2004
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Martin, Jean-louis; Haure, Joel; Dupuy, Beatrice; Nourry, Max; Palvadeau, Hubert; Papin, Mathias; Penisson, Christian; Thouard, Emmanuel.
La baie de Bourgneuf est un bassin de 34000 ha dont l'activité ostréicole représente à elleseule plus de 95% du chiffre d'affaire local réalisé par la production conchylicole. Lesdifférentes études qui ont été réalisées ont montré que le stock d'huîtres en élevage (40000t) et la production annuelle (13000 t) qui en est issue variaient peu au cours des années (Barillé-Boyer et al., 1997, Haure et al. , 2003). Toutefois, les performances de croissance, ainsi que la qualité des huîtres produites sont médiocres et place ce bassin au dernier rang des sites français de production (données du réseau REMORA). Plusieurs études ont été entreprises, pour expliquer ce phénomène, par l'approche de la capacité trophique de cet écosystème et l'estimation des biomasses...
Tipo: Text
Palavras-chave: Conchyliculture; Biomasse; Stocks; Huîtres creuses; Crassostrea gigas; Baie de Bourgneuf.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/00048/15877/13299.pdf

Estimation des stocks d'huîtres cultivées dans la Baie de Bourgneuf en 1986
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Baud, Jean-pierre; Haure, Joel.
Une estimation du stock d'huîtres creuses, en élevage dans la Baie de Bourgneuf, a été effectuée en octobre 1986 . Le stock s'élevait à cette période à 37 821 tonnes avec une précision de 5 %. Ce chiffre se décompose en 22 327 tonnes de collecteurs (précision 13 %) et 15 123 tonnes de poches (précision 12 %) . La biomasse moyenne sur les zones d'élevage est estimée à 6,1 kg .m-1 avec un pourcentage d'exploitation des secteurs concédés égal à 58, 59 % et un taux d'occupation, en zone exploitée de 0, 228 . Il n'y a pas de différence sensible avec le stock global et l'estimation des superficies exploitées en 1985. Cependant l'amélioration du plan d'échantillonnage a permis de mettre en évidence une décroissance des rendements du Nord vers le Sud de la Baie de...
Tipo: Text
Palavras-chave: Ostréiculture; Stocks; Densité; Croissance; Production huître creuse; Baie de Bourgneuf.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/00048/15891/13313.pdf

Estimation des stocks d'huîtres cultivées dans le bassin de Marennes-Oléron en 1986
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Bodoy, Alain; Bacher, Cedric; Geairon, Philippe.
Une estimation du stock d' huîtres creuses en élevage dans le bassin de Marennes-Oléron a été effectuée en août 1986 . Le stock s'élevait alors à 90 000 tonnes, avec une précision de 8,4 %. Ce stock se répartit en 30 300 tonnes pour l'élevage à plat et 59 700 tonnes pour l'élevage en surélevé. Il s'est donc produit une augmentation des tonnages en élevage qui est de 9,4 % entre 1985 et 1986. L'augmentation de tonnage concerne surtout l 'élevage en surélevé, et plus particulièrement les huîtres fixées sur collecteurs. La séparation des classes d'âge au niveau des collecteurs a permis d'améliorer la précision des estimations. Elle a également permis de montrer l'importance de la classe d'âge de 1 an (16 900 tonnes), qui correspond au captage particulièrement...
Tipo: Text
Palavras-chave: Ostréiculture; Stocks; Croissance; Production; Huîtres creuses.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/00048/15903/13331.pdf

Stock characteristics of Atlantic salmon (Salmo salar) in France: a review
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Prouzet, Patrick.
The general characteristics of the main salmon (Salmo salar L.) stocks in the Massif armoricain (Brittany and Lower Normandy), in the Loire-Allier and in the Adour-Gaves-Nive have been summarized. Due to the poor quality of the previous fishing statistics, there is no clear picture of the historical evolution of the salmon stock. However, a dramatic decrease in the endemic range of Atlantic salmon in France can be shown since the mid-18th century a nd more particularly during the last 50 years. The lack of precise informations describing the size of the catches and the levels of exploitation at sea and in the estuaries make it impossible to estimate the impact that exploitation has led on the evolution of salmon stocks. The mean age of salmon in freshwater...
Tipo: Text
Palavras-chave: Saumon Atlantique; Salmo salar; Captures; Stocks; France; Atlantic salmon; Salmo salar; Catch records; Stocks; France.
Ano: 1990
URL: http://archimer.ifremer.fr/doc/00135/24599/22627.pdf

Distribution spatiale des stocks de poissons récifaux démersaux d'intérêt commercial et effort de pêche en Province Nord de Nouvelle-Calédonie (Pacifique occidental)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Letourneur, Yves; Labrosse, Pierre; Kulbicki, Michel.
Fish from lagoon and reef in New Caledonia are mainly caught by artisanal fisheries and subsistence fishing. The present study aimed at estimating these fish standing stocks, at finding the main factors influencing the spatial distribution of these fish, and at estimating the maximum sustainable yield with considerations for socio-economic aspects sensu late. A total of 1406 stations was surveyed in the Northern Province of New Caledonia. Sampling was stratified according to three zones (north, east and west) and three biotopes (coral reefs, near-reef areas and lagoon bottoms). This work demonstrates the existence of important fish stocks of commercial interest in reefal and lagoonal waters of the Northern Province, estimated at about 138 300 t. The...
Tipo: Text
Palavras-chave: Ichtyofaune démersale; Récifs coralliens; Fonds de lagon; Pêche artisanale; Stocks; Demersal ichthyofauna; Coral reefs; Lagoon bottoms; Artisanal fishing; Standing stocks.
Ano: 2000
URL: https://archimer.ifremer.fr/doc/00323/43383/42827.pdf

Estimation des stocks d'huîtres creuses en élevage dans la Baie de Bourgneuf en octobre 1985
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Baud, Jean-pierre; Hommebon, Prestal.
L'estimation de la biomasse réalisée en octobre 1985 en baie de Bourgneuf montre que les stocks en élevage étaient de 38 817 tonnes d'huîtres, avec une précision de 6,8%, ce chiffre se décomposant en 22 791 tonnes de collecteurs (précision 17%) et 17 727 tonnes de poches (précision 10,3%). La biomasse sur les zones cultivées est de 5,9 kg.m2. Le pourcentage d'exploitation des zones concédées est de 62,8% et le coefficient de conversion en zone exploitée de 0,219. Le traitement des données fait également apparaître une surcharge (stock au mètre linéaire) de la strate des collecteurs de 2 ans et plus. Cette surcharge se trouve accentuée par l'agencement en doubles rangées des tables sur les concessions.
Tipo: Text
Palavras-chave: Ostréiculture; Stocks; Densité; Production; Baie de Bourgneuf; Vendée.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/00171/28239/26497.pdf

L'ostréiculture sur la côte Est du Cotentin
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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

Exploitation des huîtres en Nouvelle Calédonie échantillonnage des stocks naturels d'huîtres de paletuviers (Saccostrea cucullata) et aménagement des pêches
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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

Population genetic structure and body shape assessment of Pagrus pagrus (Linnaeus, 1758) (Perciformes: Sparidae) from the Buenos Aires coast of the Argentine Sea
Provedor de dados: Neotropical Ichthyology
Autores: Porrini,Leonardo P.; Iriarte,Pedro J. Fernández; Iudica,Celia M.; Abud,Eddie Aristizabal.
This study highlights the analysis of the morphological and genetic variation of the common sea bream Pagrus pagrus, and compares its two main areas of concentration: the northern (35ºS - 38ºS) and the southern areas (39ºS - 41ºS) of the Buenos Aires coast of the Argentine Sea. Body shape characterization presented two significantly different morphotypes (Wilks' Lambda=0.224, P&lt;0.001). Northern individuals displayed a higher middle area while southern ones were smaller and their caudal peduncle was shorter. The northern and southern areas did not yield significant genetic differences either with the control region or the microsatellite loci, revealing that P. pagrus is not genetically structured. However, individuals from these areas should not be...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geometric morphometrics; Management unit; Mitochondrial DNA; Stocks.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000200431

Pesca comercial de anchoíta bonaerense (Engraulis anchoita) entre 1993 y 2011
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Garciarena, A.D.; Buratti, C.C.
The fishing activity on Argentine anchovy Northern stock (34º S-41º S) during the 1993-2011 period was studied (SW Atlantic Ocean, Argentine Sea). The basic data derived from the commercial fleet catch records. Annual landings reached a minimum of 5,900 t in 1999 and a maximum of 36,300 t in 2004. The largest catches, performed by the offshore ice chilling fleet, averaged 11,800 t. As of 2003 it was observed an increase in the coastal ships share and a decrease in that of the inshore fleet that in 2004-2011 represented less than 3% of total landings. The major activity, developed between 37º S-41º S in the August-November period, had Mar del Plata as the main port of landing. The average catch per trip and the mean HP of ships, that as of 1999 increased in...
Tipo: Journal Contribution
Palavras-chave: Commercial fishing; Clupeoid fisheries; Stocks; Landing statistics.
Ano: 2013
URL: http://hdl.handle.net/1834/5495

Pêcherie démersale côtière au Sénégal. Essai de modélisation de la dynamique de l'exploitation des stocks
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Institut de Recherche pour le Développement, Paris (France); Fall, Massal.
Français - Les traits essentiels de la côte sénégalaise, repères historiques de la pêche, communautés de pêcheurs, caractéristiques des flottes et modes d’accès à la ressource et d’interaction sont analysés. Les caractéristiques, tendances décroissantes de l’abondance,niveaux d’exploitation, mesures d’aménagement, relations interspécifiques, changements potentiels et sources de variation des stocks démersaux côtiers sont précisés. Les notions de tactiques et stratégies de pêche sont passées en revue, conceptualisées puis étudiées.Le modèle «Dynamique Conjointe Exploitation Ressource» utilisé repose sur la définition de 4 typologies. L’utilisation de méthodes de classification et de connaissances d’experts conduit à considérer 32 stocks, 31 strates, 82...
Tipo: Theses and Dissertations
Palavras-chave: Fisheries; Demersal fisheries; Modelling; Stocks; Ecosystems; Community fishing; Inland waters; Marine water; Hydrologic cycle; Fishermen; Fishing fleet; Shrimp fisheries; Capture fisheries; Fisheries management; Trawling; Artisanal fishing; Fishing licenses.
Ano: 2009
URL: http://hdl.handle.net/1834/5004

Estudio de la morfometría de las sagittae en poblaciones de sciaenidos marinos de aguas cálidas del Perú y aguas templado-frías de Argentina
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Volpedo, A.
Otoliths (sagitta, asteriscus and lapillus)are complex structures composed of calcium carbonate, other minerals, and a protein matrix. Otoliths are located in the internal ear of the teleost fishes. The shape and structure of otoliths are specific for each species. For this reason, otoliths are used to identify species in biological and ecological studies.Sciaenids conform a group of fishes of commercial importance, so the handling of this resource is a high-priority topic for the local and national economies of countries that exploit these species. The purpose of this work is to study different aspects of the sagittae of marine sciaenids from Argentina and Peru. The morphology, morphometry and chemical composition has been analyzed in relation to the...
Tipo: Theses and Dissertations
Palavras-chave: Otoliths; Morphometry; Identification keys; Indicator species; Dimensions; Trace metals; Environmental factors; Stocks; Coastal fisheries; Otoliths; Dimensions; Environmental factors; Stocks; Indicator species; Coastal fisheries; Http://aims.fao.org/aos/agrovoc/c_27091; Http://aims.fao.org/aos/agrovoc/c_2283; Http://aims.fao.org/aos/agrovoc/c_2594; Http://aims.fao.org/aos/agrovoc/c_28772; Http://aims.fao.org/aos/agrovoc/c_35790; Http://aims.fao.org/aos/agrovoc/c_1696.
Ano: 2001
URL: http://hdl.handle.net/1834/3132

Analyse de l'état des stocks d'albacore (Thunnus albacares) et de listao (Katsuwonus pelamis) de l'Atlantique au 30 septembre 1980
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Fonteneau, A.; Cayre, P.
L'article analyse l'état des stocks d'albacore et de listao d'après les informations les plus récents disponibles. Le modéle de production géréralisé est employé en utilisant des données améliorées opue FISM. L'analyse conclue que le stock d'albacore est fortement exploité à un niveau  proche de ou légérement supérieure à la prise anuuelle équilibrée.. La production par  par recrue de la pêcherie est probablement à un niveau élevé du fait de l'importance captures de gros albacores réalisés par les senneurs et les palangriers. Celle-ci pourrait probablement être améliorée en réduisant les prises de petits albacores hors taille qui demeurent très importantes, tant chez les senneurs que chez les canneurs. Le même modéle appliqué au stock de listao n'a pas...
Tipo: Report
Palavras-chave: Fishery biology; Stocks; Tuna fisheries; Fishing vessels statistics; Stocks; Fishery biology; Http://aims.fao.org/aos/agrovoc/c_28772; Http://aims.fao.org/aos/agrovoc/c_2937.
Ano: 1980
URL: http://hdl.handle.net/1834/2890

Etude sur le savoir écologique des pêcheurs artisans des petits pélagiques en Afrique du Nord-Ouest
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Sall, A.
Agriculture, Nature and Food Quality, Den Haag (Netherlands); Ministerie Van Buitenlandse Zaken,  Brussel (Belgium); Wageningen International,  Wageningen (Netherlands)
Tipo: Report
Palavras-chave: Fisheries; Artisanal fishing; Fishermen; Fishing effort; Canoe fisheries; Coastal zone; Fishery engineering; Protected resources; Pelagic fisheries; Cycles; Sexual reproduction; Multispecies fisheries; Stocks; Ocean currents; Winds; Biomass; Upwelling; Ecosystems; Maritime legislation; Size; Biomass; Ecosystems; Fisheries; Fishermen; Stocks; Ocean currents; Winds; Size; Fishing effort; Pelagic fisheries; Sexual reproduction; Multispecies fisheries; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_2482; Http://aims.fao.org/aos/agrovoc/c_2934; Http://aims.fao.org/aos/agrovoc/c_2936; Http://aims.fao.org/aos/agrovoc/c_28772; Http://aims.fao.org/aos/agrovoc/c_12883; Http://aims.fao.org/aos/agrovoc/c_8401; Http://aims.fao.org/aos/agrovoc/c_7093; Http://aims.fao.org/aos/agrovoc/c_24027; Http://aims.fao.org/aos/agrovoc/c_5659; Http://aims.fao.org/aos/agrovoc/c_26876; Http://aims.fao.org/aos/agrovoc/c_4987.
Ano: 2009
URL: http://hdl.handle.net/1834/3671

Parámetros biológicos relevantes para las pesquerías de anchoíta argentina (Engraulis anchoita). Estimaciones resultantes de reunir datos de campañas de investigación (1993 a 2008) y de muestras de capturas comerciales (1986 a 2009)
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Hansen, J.E.
The aim of this paper was to accurately estimate population parameters of northern (“bonaerensis”, latitude &lt; 41° S) and southern (“patagonic”, latitude 41° S) Argentine anchovy stocks and to describe some aspects of their behaviour. The research surveys allowed to obtain data on length, total weight, sex, maturity and age of 27,853 specimens of the northern and 12,787 of the southern stocks. Besides, 20,717 age determinations stemmed from commercial landing samplings of the northern stock were established. Sex proportion in the northern population was 0.50 : 0.50; the southern showed a slight predominance of males (0.52 : 0.48). Data derived from cruises and commercial landings showed statistical differences in the growth ratio of the northern stock...
Tipo: Journal Contribution
Palavras-chave: Pelagic fisheries; Stocks; Population characteristics; Growth; Natural mortality; Sexual maturity; Engraulis anchoita; Marine environment.
Ano: 2011
URL: http://hdl.handle.net/1834/4884

Aménagement des pêcheries maritimes artisanale au Sénégal: bilan et perspectives
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Diouf, Sidiya.
Tipo: Theses and Dissertations
Palavras-chave: Fisheries management; Maritime space; Stocks; Fishing gear; Fishing zone; Artisanal fishing.
Ano: 2006
URL: http://hdl.handle.net/1834/4999

Resultats generaux de la peche maritime senegalaise
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Direction des Pêches Maritimes.
Tipo: Report
Palavras-chave: Statistique de peche; Fishery economics; Fishery statistics; Exportation; Fish catch statistics; Peche industrielle; Capture; Flotille de peche; Senegal; Demersal fisheries; Pelagic fisheries; Stocks; Peche artisanale; Fisheries statistics.
Ano: 2003
URL: http://hdl.handle.net/1834/769

Composición química y perfil de ácidos grasos de la anchoíta bonaerense en función del tamaño de los ejemplares y la zona de pesca
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Massa, A.E.; Fernández Compás, A.S.; Pennisi Farell, S.C.; Manca, E.A.
The aim of this study was to determine the chemical composition and fatty acids profile present in Argentine anchovy (Engraulis anchoita) northern population as a function of fish size and fishing area (SW Atlantic Ocean, Argentine Sea). Samples were collected during the northern stock assessment cruise of the Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP) carried out on board of  FRV Capitán Oca Balda in Spring 2008 (OB-02/2008). The fishing trawls were performed between 34º 35' S and 40º 19' S. The area was divided in two zones: the northern, between 34º S-38º S, strongly influenced by the mixohaline waters of the Río de la Plata River estuary and the southern, between 38º S-41º S, that included the El Rincón coastal area. In each...
Tipo: Journal Contribution
Palavras-chave: Fishing grounds; Stocks; Chemical composition; Fatty acids; Size.
Ano: 2013
URL: http://hdl.handle.net/1834/5499

Etude diagnostic de la pêcherie de mulets sur la grande côte du Sénégal
Provedor de dados: Ocean Docs: e-repository of  publications
Tipo: Book
Palavras-chave: Mullet fisheries; Reproduction; Growth; Migrations; Ecology; Stocks; Landing statistics; Inland fisheries; Fishing gear; Exploitation; Canoe fisheries; Marketing; Artisanal fishing; Fishing licenses; Mesh regulations; Protected areas; Reef fisheries; Fishing effort.
Ano: 2009
URL: http://hdl.handle.net/1834/4578

Projet d'aménagement des stocks pélagiques partagés : Cas des pêcheries de mulets et de courbines en Mauritanie et au Sénégal
Provedor de dados: Ocean Docs: e-repository of  publications
En Afrique de l'Ouest, la zone littorale et ses ressources représentent une composante essentielle pour le développement. Près de 60% de la population est concentrée à moins de 20 km des côtes . La part des ressources halieutiques dans l'alimentation des populations est très importante et croissante. Au Sénégal par exemple, elles contribuent jusqu'à 70% des apports en protéines. A cela s'ajoute le poids socio-économique très important de la pêche en général et de la pêche artisanale en particulier devenue l'un des secteurs les plus stratégiques pour l'économie nationale en Mauritanie notamment. Le Cadre Stratégique de Lutte contre la Pauvreté du Gouvernement Mauritanien considère que : "compte tenu des possibilités qu'elle offre en terme de création...
Tipo: Report
Palavras-chave: Artisanal fishing; Fisheries; Fishermen; Stocks; Capture fishery economics; Fish eggs; Fish fillets; Fishing effort; Fishery technology; Mullet fisheries; Pelagic fisheries; Ecosystems; Fisheries; Fishermen; Stocks; Fish fillets; Ecosystems; Fishing effort; Pelagic fisheries; Http://aims.fao.org/aos/agrovoc/c_2934; Http://aims.fao.org/aos/agrovoc/c_2936; Http://aims.fao.org/aos/agrovoc/c_28772; Http://aims.fao.org/aos/agrovoc/c_29019; Http://aims.fao.org/aos/agrovoc/c_2482; Http://aims.fao.org/aos/agrovoc/c_24027; Http://aims.fao.org/aos/agrovoc/c_5659.
Ano: 2002
URL: http://hdl.handle.net/1834/4090

Note sur l’exploitation expérimentale de la praire (&lt;Venus verrucosa&gt;) en Baie du Lévrier  (Mauritanie)
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Diop, M.
Note Scientifique
Tipo: Other
Palavras-chave: Exploitation; Marine molluscs; Potential resources; Product development; Stocks; Stocks; Product development; Http://aims.fao.org/aos/agrovoc/c_28772; Http://aims.fao.org/aos/agrovoc/c_16018.
Ano: 1988
URL: http://hdl.handle.net/1834/1190

Sustainable Exploitation of Maritime Stocks in the West African Marine Eco-Region within the Context of ACP-EU Relation
Provedor de dados: Ocean Docs: e-repository of  publications
This paper will mainly focus on the Western Africa Marine Eco-Region, (WAMER) composed of Mauritania, Senegal, Cape Verde, The Gambia, Guinea-Bissau and Guinea. Since all the countries in this eco-region, except The Gambia, have fisheries agreements with the European Union (EU), they provide an interesting example of ACP-EU relations in the fishery sector. In the WAMER eco-region, the fishery sector is a source of foreign currency, jobs and food for more than 22 million people. A look at the current fishery stock shows alarming trends: decrease in average size of fish caught, reduction in Catch per Unit of Effort (CPUE) for various species, especially the coastal demersals,1 etc. Depletion of marine stocks would have disastrous economic and social effects.
Tipo: Conference Material
Palavras-chave: Stocks; Fishery policy.
Ano: 2003
URL: http://hdl.handle.net/1834/454

El canibalismo como mecanismo regulador denso-dependiente de mortalidad natural en la anchoíta argentina Engraulis anchoita. Su relación con las estrategias reproductivas de la especie.
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Pájaro, M.
Cannibalism is not an abnormal behaviour and it can be observed in a wide number of animals. In Pisces, cannibalism may be the result of endogenous intraspecific factors (nutritional state, size, age, state of development) or exogenous intraspecific factors (food, density, light). Nevertheless, external fertilization and the high fecundity of teleost fish tend to increase egg cannibalism, in particular among filter feeding fishes such as anchovies. In the present work, two important Argentine anchovy Engraulis anchoita stocks were studied. The first is to the north of 41°S, and spawns during spring on the coastal and shelf waters of Buenos Aires Province,Argentina, and Uruguay. The second one inhabits the Patagonian region, from 41°S to 47°S. It spawns...
Tipo: Theses and Dissertations
Palavras-chave: Feeding behaviour; Cannibalism; Natural mortality; Fish larvae; Fish eggs; Spawning seasons; Stocks; Food preferences; Reproduction; Stocks; Food preferences; Feeding behaviour; Cannibalism; Fish larvae; Reproduction; Http://aims.fao.org/aos/agrovoc/c_28772; Http://aims.fao.org/aos/agrovoc/c_3024; Http://aims.fao.org/aos/agrovoc/c_10778; Http://aims.fao.org/aos/agrovoc/c_9580; Http://aims.fao.org/aos/agrovoc/c_2924; Http://aims.fao.org/aos/agrovoc/c_6507.
Ano: 1998
URL: http://hdl.handle.net/1834/1476

Factores oceanográficos relacionados con la abundancia relativa de anchoíta (Engraulis anchoita) sobre la plataforma bonaerense (34°S-41°S) durante la primavera
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Martos, P.; Hansen, J.E.; Negri, R.M.; Madirolas, A.
Research has been conducted to study the relationship between some physical variables and the relative abundance of the northern stock of the Argentine anchovy (Engraulis anchoita) within the main area of distribution of the stock during springtime. Basic data were recorded during four research surveys mainly aimed at the acoustic assessment of the stock between 34°S and 41° 30'S (Buenos Aires prov., Argentina - Uruguay). The cruises were always carried out in October from 1993 to 1996. Several environmental variables were simultaneously input into a General Linear Model to analyze the variations on fish abundance; however, the model did not account for more than 17-20% of the total variance. Nevertheless most of those factors (sea surface temperature,...
Tipo: Journal Contribution
Palavras-chave: Clupeoid fisheries; Seasonal distribution; Abundance; Stocks; Fronts; Salinity gradients; Stocks; Http://aims.fao.org/aos/agrovoc/c_28772.
Ano: 2005
URL: http://hdl.handle.net/1834/1559

Distribución de desovantes y estimación de variables reproductivas del efectivo norteño de merluza (Merluccius hubbsi) (35º'S-41º'S) durante mayo de 2009
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Rodrigues, K.A.; Macchi, G.J.
Spawning and reproductive variables of the northern hake stock were analyzed using macroscopic and histologic gonad information derived from samples collected in May 2009. The study includes estimates of batch fecundity, spawning frequency, oocyte dry weight and size at first maturity. During May 2009 the reproductive activity of the northern hake stock took place mainly near the 50 m isobath, north of 37° S. Spawning occurred within a temperature range of 9 °C-15 °C that coincided with a bottom thermal front. Size at first maturity, much lower than that reported at the beginning of the 1980s, showed differences between males (27.16 cm TL) and females (32.84 cm TL). The reproductive frequency was estimated at one spawning every 13 days and mean batch...
Tipo: Journal Contribution
Palavras-chave: Stocks; Spawning populations; Histology; Fecundity; Gadoid fisheries; Merluccius hubbsi; Marine environment.
Ano: 2011
URL: http://hdl.handle.net/1834/4883

Revisión y síntesis de las estimaciones acústicas de abundancia de anchoíta (Engraulis anchoita) efectuadas entre 1993 y 2008
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Madirolas, A.O.; Hansen, J.E.; Cabreira, A.G.
The annual research planning of the Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP, Mar del Plata, Argentina) includes at least two surveys to estimate the total biomass of Argentine anchovy Northern and Southern stocks. The assessment is performed using hydroacoustic techniques and the Daily Egg Production Method. In this paper the results of the acoustic estimates obtained during the 1993-2008 period are summarized. Besides, the studies performed to determine the characteristics of the species behavior such as vertical migrations or avoidance reactions to vessels that would produce uncertainty about estimates absolute value are discussed.
Tipo: Journal Contribution
Palavras-chave: Pelagic fisheries; Stocks; Echo surveys; Echo integrators; Abundance.
Ano: 2013
URL: http://hdl.handle.net/1834/5493

Identification et définition des termes nécessaires à la révision de la convention sur les conditions minimales d'accés des pays de la CSRP
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Talla, M.D.
Commissions Sous Régionale des Pêches, Dakar (Sénégal) IUCN, Dakar (Sénégal)
Tipo: Book
Palavras-chave: Fishery resources; Resource surveys; Artisanal fishing; Fishery management; Fishery regulations; Fishery statistics; Fishing effort; Fishing vessels; Fish inspection; Quality control; Stocks; Fishery management; Stocks; Fishery resources; Fishing effort; Fishing vessels; Fish inspection; Http://aims.fao.org/aos/agrovoc/c_24026; Http://aims.fao.org/aos/agrovoc/c_28772; Http://aims.fao.org/aos/agrovoc/c_2942; Http://aims.fao.org/aos/agrovoc/c_24027; Http://aims.fao.org/aos/agrovoc/c_2954; Http://aims.fao.org/aos/agrovoc/c_10877.
Ano: 2008
URL: http://hdl.handle.net/1834/2894

Applying a non-parametric bootstrap technique to assess the accuracy of biomass estimates of argentine anchovy (Engraulis anchoita) northern stock (34º S-41º S) with the Daily Egg Production Method. 1993-2008 period
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Pájaro, M.; Hansen, J.E.; Leonarduzzi, E.
Engraulis anchoita northern stock reproductive biomass (SSB) during the 1993-2008 period was estimated applying the Daily Egg Production Method (DEPM) and accuracy of estimates assessed using a bootstrap technique (SW Atlantic Ocean, Argentine Sea). The basic data were collected in different research surveys carried out in late Spring, at the peak of the spawning season. The aim of this work was to build reliable confidence intervals around the estimates of the mean reproductive biomass applying a non-parametric bootstrap method. Resampling methods are becoming increasingly popular as statistical tools as they are robust and do not require the assumption of any particular distribution of the basic data. This is especially relevant when assessing the DEPM...
Tipo: Journal Contribution
Palavras-chave: Spawning; Stocks; Fecundity; Biomass; Statistical analysis.
Ano: 2013
URL: http://hdl.handle.net/1834/5494

COMMODITY INDEX FUNDS AND PRICE SWINGS: CONDITIONS OF CAUSALITY
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Gohin,   Alexandre; Cordier,   Jean.
The role played by “speculators” during the 2007/08 food price spike is lively disputed. Our analysis focuses on the increasing participation of index funds in agricultural commodity futures markets before the food price spike. Our central theme is to determine if their prespike massive entry does prepare the subsequent crisis by maintaining low stock levels. We develop a theoretical model explaining the behaviour of speculators and traders on futures and cash markets. We allow index funds to inflict an informational externality on commercial traders that is supposed to induce a lower desire to hold stock. We find out that, once the production decisions of commercial traders are taken into account into the model, the increased net long position of index...
Tipo: Conference Paper or Presentation
Palavras-chave: Futures markets; Commodity price; Index funds; Stocks; Food Consumption/Nutrition/Food Safety; Risk and Uncertainty.
Ano: 2010
URL: http://purl.umn.edu/91283

ESTRUTURAÇÃO DE UM ÍNDICE DE PREÇOS DE AÇÕES DO AGRONEGÓCIO BRASILEIRO LISTADAS NA BOVESPA
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Souza,   Waldemar Antonio da Rocha; Silva,   Rodolfo Margato; Martines-Filho,   Joao Gomes.
O agronegócio brasileiro vem assumindo forte predominância no cenário econômico, destacando-se como principal responsável pelos crescentes volumes de exportação do País.  As empresas que compõem esse segmento apresentam características econômico-financeiras particularizadas, correlacionadas com as condicionantes intrínsecas do setor. O presente estudo objetiva elaborar e analisar uma metodologia para captar a evolução de dado conjunto de ativos financeiros relacionados ao agronegócio brasileiro, particularmente as ações de companhias abertas do setor negociadas na Bolsa de Valores de São Paulo (BOVESPA), com o intuito de delinear as suas características próprias comparativamente a outros instrumentos disponíveis no mercado de capitais. Com base na...
Tipo: Conference Paper or Presentation
Palavras-chave: Agronegócio; Índice; Ações; BOVESPA; Metodologia; Agribusiness; Index; Stocks; BOVESPA; Methodology; Agribusiness.
Ano: 2008
URL: http://purl.umn.edu/108571

AN ECONOMIC ANALYSIS OF A FOOD SECURITY COMMODITY RESERVE: COMMODITY VS. CASH
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Young,   C. Edwin; Westcott,   Paul C.; Hoffman,   Linwood A.; Lin,   William W.; Rosen,   Stacey L.
The cost of operating the Food Security Commodity Reserve as a commodity reserve was compared with the cost of a cash reserve to purchase food aid supplies only in the period of need.  Preliminary simulation results reveal the cash reserve to be less costly in almost all cases.
Tipo: Conference Paper or Presentation
Palavras-chave: Food aid; Agricultural policy; Stocks; Agricultural and Food Policy; Food Security and Poverty.
Ano: 1999
URL: http://purl.umn.edu/21622

Food Reserve Stocks and Critical Food Shortages - a Proposal Based on the Needs of Sub-Saharan Africa
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Lind,   Kim Martin.
This working paper examines the food security policy, where food security means ensuring an adequate supply of food for hungry people. In particular, the recommendations of FAO are being used as a measuring rod against which food security policies are assessed. By means of FAO's database a statistical analysis of all Sub-Saharan Africa countries with respect to measuring the incidence and severity of critical food shortages are carried out. Stock policies seem to have been the answer when issues of ensuring adequate supplies have surfaced. In the paper, an estimate of the costs of keeping stocks is provided, and the costs are quite staggering. Based on the statistical analysis an estimate of the number and volume of acute food shortages per year in...
Tipo: Conference Paper or Presentation
Palavras-chave: Food; Stocks; Shortages; Uncertainty; Sub-Saharan Africa; Food Security and Poverty.
Ano: 2002
URL: http://purl.umn.edu/24935

Estimation of carbon stocks under different soil uses in the central highlands of Mexico
Provedor de dados: Acta Agronómica
Autores: Álvarez-Arteaga*,Gustavo; García-Fajardo,Belina; Orozco-Hernández,María Estela; Mireles-Lezama,Patricia; Contreras-Martínez,Julieta.
Abstract The loss of organic carbon stocks from the soil and their expulsion into the atmosphere due to the effect of anthropogenic activities must be understood as a problem that goes beyond the environmental to the social and economic context, with the soil degradation being just one of its many impacts. While the accumulation of carbon in the soil depends naturally on the interaction among a series of biotic and abiotic factors, management practices often cause the deterioration of its physical, chemical and biological properties, and, thus, increase the levels of mineralization and a reduction in carbon stocks. This research was undertaken in the municipality of San José del Rincón, State of Mexico, in volcanic soils under different conditions of soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stocks; Bulk density; Organic material; Management practices; Forest soils.
Ano: 2017
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000100021