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Registros recuperados: 12
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Análise do manancial e da pescaria de Magumba, Hilsa kelee (Cuvier, 1829) na Baía de Maputo, Moçambique, no período de 1992-2010 OceanDocs
Inacio, A.; Barros, P.C..
Foi feita uma avaliação da pescaria e do manancial de Hilsa kelee (magumba) na Baía de Maputo em Janeiro de 2011. Para a avaliação, foram aplicados dois tipos de modelos, um modelo dinâmico de produção geral baseado no modelo logístico de Schaefer, usando os dados de captura e índices de abundância, modelos baseados na composição por comprimentos e um modelo de podução por recruta por comprimentos com uma série de dados do período de 1992-2010. Os níveis de esforço de pesca mais elevados foram registados no ano de 2007 e o menor em 2009. As capturas totais estimadas para o período de 2006 a 2010 apresentam níveis abaixo das 3.000 t. O valor estimado mais baixo, cerca de 1.100 t, foi para o ano de 2009. A CPUE mostra um nível baixo em 2007 (119 kg por dia...
Tipo: Journal Contribution Palavras-chave: Fish stocks; Stock assessment.
Ano: 2012 URL: http://hdl.handle.net/1834/5141
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Campagnes expérimentales de chalutage en mer du Nord et Manche Orientale. Volume I. Les campagnes I.B.T.S. 1997 & 1998 ArchiMer
Verin, Yves; Dufour, Jean-louis.
Since 1976, France participates to the International Bottom Trawl Survey (IBTS), coordinated by the International Council for Exploration of the Sea (ICES). The main objective of the survey which is carried out on board of a research vessel, is to obtain annual forecasts of recruitment for the various commercial fish species of the North Sea. These estimates are used by ICES Working Groups to assess these various stocks and to propose management measures for the following year. In addition, the data collected during these surveys concern biological and abundance analysis of main commercial fish species exploited by European countries in the North Sea. The results of studies are published in scientific papers and have improved knowledge in this field....
Tipo: Text Palavras-chave: Mer du Nord. CIEM; Recrutement; Stocks de poissons; Indices d'abondance; Chalutage; Campagne d'échantillonnage; Mer du Nord; [CES; Recruitment; Fish stocks; Abundance indices; Trawling; Survey..
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00306/41760/40973.pdf
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Combined effects of exploitation and temperature on fish stocks in the Northeast Atlantic ArchiMer
Rouyer, Tristan; Fromentin, Jean-marc; Hidalgo, Manuel; Stenseth, Nils C..
Fish stock fluctuations are affected by two potentially confounding forces: the removal of individuals by fisheries and climatic variations affecting the productivity of fish populations. Disentangling the relative importance of these forces has thus been a question of primary importance for fisheries management and conservation. Through the analysis of long-term time-series for 27 fish stocks from the Northeast Atlantic, the present study shows that the sign and intensity of the effect of temperature on biomass are dependent on the geographical location: the stocks located at the southernmost and northernmost latitudes of our study displayed stronger associations with temperature than the stocks located in the middle range of latitudes. As a consequence,...
Tipo: Text Palavras-chave: Combined climate/exploitation effect; Exploitation; Fish stocks; Northeast Atlantic; Response to climate; Time-series.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00230/34107/32821.pdf
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Détermination de la composition spécifique d'un banc de poissons pélagiques pêchés dans la ZEE ivoirienne. OceanDocs
Diaha, N'guessan Constance; Sylla, S.; Konan, K.J.; Joanny, Tapé Gnahoré Toussaint; N'da, Konan.
Cette méthode de pêche expérimentale est réalisé par tous les navires de recherche dans les eaux marines des pays côtiers pour une évaluation sous régionale des stocks de poissons. Elle a ainsi permis d'identifier les différentes espèces composant une cohorte pélagique dans la ZEE ivoirienne. Ces bancs détectés variaient en fonction des saisons de pêche.
Tipo: Journal Contribution Palavras-chave: Banks (topography); Trawling; Fish stocks.
Ano: 2010 URL: http://hdl.handle.net/1834/5780
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Evaluation et cartographie de l'abondance du stock de la sardinelle ronde dans la zone Nord Ouest Africaine OceanDocs
Ould Isselmou, Cheikh Baye.
Ce travail est une première tentative de mise en application de la VPA et l’ajustement en pseudo équilibre du fox sur le stock de la sardinelle ronde dans la zone Nord Ouest Africaine qui constitue le modèle global le plus adapte par les études d’évaluation pour cette espèce. Dans un premier temps, ce mémoire a permis de réaliser une description fine de la pêcherie ciblant la sardinelle ronde et une estimation des captures en tailles en recourant à plusieurs techniques d’extrapolation. Une courbe de croissance a été établie à partir des données de lecture d’otolithes ajuste mieux les données observées. L’application de la décomposition polymodale sous une contrainte a permis d’estimer les captures en âges sur une longévité de 5 ans. L’évaluation de stock...
Tipo: Theses and Dissertations Palavras-chave: Stock assessment; Fish stocks; Sardinella fisheries; Population abundance (in number); Pelagic fish; Pelagic fisheries; Pelagic fisheries; Sardinella.
Ano: 2009 URL: http://hdl.handle.net/1834/4756
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Length-weight relationship and condition factor of eight fish species from the upper Araguari River, State of Amapá, Brazil Biological Sciences
Prestes, Luiza; Oliveira, Marcos Sidney Brito; Tavares-Dias, Marcos; Soares, Maria Gercilia Mota; Cunha, Fabiana Calacina.
The present study estimated parameters of the length-weight relationship (LWR) and allometric condition factor for eight fish species from the upper Araguari River, in the State of Amapá, Brazil. A total of 615 fish of eight species were analyzed: Acestrorhynchus falcatus, A. falcirostris, Ageneiosus inermis, Hemiodus unimaculatus, Hoplias aimara, Myloplus asterias, M. ternetzi and Tometes trilobatus. The allometric condition factor varied from 0.742 to 1.435. The coefficient of allometry ranged from 2.723 to 3.225. The coefficient of determination (R2) of the LWR ranged from 0.742 to 0.985. This is the first estimate of the length-weight relationship for fish from the Araguari River and the first record of these parameters for Myloplus ternetzi and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Growth; Fish stocks; Eastern Amazon; Stock assessment. Growth Fish stocks Eastern Amazon State of Amapá.
Ano: 2019 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/46666
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Les campagnes de chalutages expérimentaux en mer du Nord ArchiMer
Verin, Yves.
Since 1976, France participates to the International Bottom Trawl Survey (IBTS), coordinated by the International Council for Exploration of the Sea (ICES). The main objective of these surveys, which are carried out on board of research vessels, was to obtain annual forecasts of recruitment for the various commercial fish species of the North Sea. These estimates were used by ICES Working Groups to assess these various stocks and to propose management measures for the following year. In addition, the data collected during these surveys concerned biological and abundance analysis of main commercial fish species exploited by European countries in the North Sea. The results of studies were published in scientific papers and have improved knowledge in this...
Tipo: Text Palavras-chave: Fish stocks; ANE; North Sea; Juveniles; Recruitment; Abundance index; Trawling survey.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00091/20224/17876.pdf
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Potential fishery resources and present state of exploited stocks OceanDocs
Ssentongo, G.W..
FAO CECAF
Tipo: Book Section Palavras-chave: Fish stocks; Fishery resources.
Ano: 1987 URL: http://hdl.handle.net/1834/682
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Resultats des Campagnes Echosar 1 et Echosar 2 : Prospection des stocks pelagiques le long des cotes du Senegal, de la Gambie et de la Mauritanie OceanDocs
Josse, E.; Lopez, J.; Gerlotto, F..
Tipo: Report Palavras-chave: Gambie; Fishery stocks; Senegal; Cruises; Echosar; Mauritanie; Pelagic fisheries; Fish stocks.
Ano: 1982 URL: http://hdl.handle.net/1834/767
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The European Landing Obligation. Reducing Discards in Complex, Multi-Species and Multi-Jurisdictional Fisheries ArchiMer
Uhlmann, Sven Sebastian; Ulrich, Clara; Kennelly, Steven J.
This open access book provides a comprehensive examination of the European Landing Obligation policy from many relevant perspectives. It includes evaluations of its impacts at economical, socio-cultural, ecological and institutional levels. It also discusses the feasibility and benefits of several potential mitigation strategies. The book was timely published, exactly at the time where the Landing Obligation was planned to be fully implemented. This book is of significant interest to all stakeholders involved, but also to the general public of Europe and to other jurisdictions throughout the world that are also searching for ways to deal with by-catch and discard issues.
Tipo: Text Palavras-chave: Discard; Fish By-catch; Marine spatial planning; European waters; Landing obligation; Ecosystems; Fish stocks; NGO; Fisheries policy; MINOUW; DiscardLess; Open Access.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00589/70084/68066.pdf
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The United Nations Fish Stocks Agreement OceanDocs
Juda, L..
It is generally conceded that world marine fisheries are facing difficult times. Quantitatively world fish catch has levelled off, and qualitatively the portion of total fish catch representing high-quality, high-priced, and high-demand fish stocks is declining. A recent study indicates that fishing effort is proceeding farther down the food chain as the desired species at the top of that chain are becoming less abundant.1 While there is some discussion as to whether and to what degree the problem is due to natural causes such as El Niño or to anthropogenic causes such as overfishing and habitat destruction, it is clear that in many cases overfishing, associated with modern technology, increased effort, and open access, has been a significant contributor...
Tipo: Book Section Palavras-chave: Fish stocks; United Nations; Http://aims.fao.org/aos/agrovoc/c_15078.
Ano: 2002 URL: http://hdl.handle.net/1834/755
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Towards the development of environmental indices for the Namibian shelf, with particular reference to fisheries management. OceanDocs
Bartholomae, Ch.; Van der Plas, A..
The Namibian Ministry of Fisheries and Marine Resources has the task of collecting and providing relevant oceanographic information for management of their fisheries. However, quality information is difficult to provide because of the complexity of the processes involved in the Namibian marine ecosystem. Nonetheless, there are oceanographic data available that can contribute to fisheries management by improving the general understanding of important oceanographic processes related to fisheries. The focus of this paper is on the development of simple environmental indices that can serve as a measurement or proxy of the state or intensity of certain important oceanographic processes or variables for temporal comparison. These indices relate to oceanographic...
Tipo: Journal Contribution Palavras-chave: Fisheries management; Marine resources; Oceanographic data; Chlorophylls; Upwelling; Spatial variations; Sardine fisheries; Water temperature; El Nino phenomena; Ecosystems; Fish stocks; Surface temperature; Oxygen; Phytoplankton; Biomass; Seasonal variations; Fronts; Perturbations; Commercial fisheries; Catchability; Remote sensing; Chlorophylls; Dissolved oxygen; Environmental impact.
Ano: 2007 URL: http://hdl.handle.net/1834/4971
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