Consulta: subjectFacets:"Fish stocks"
Registros recuperados: 13
Data/hora: 05/06/2024 01:55:53

The European Landing Obligation. Reducing Discards in Complex, Multi-Species and Multi-Jurisdictional Fisheries
Provedor de dados: 5
Autores: 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

Performance of maximum likelihood mixture models to estimate nursery habitat contributions to fish stocks: a case study on sea bream Sparus aurata
Provedor de dados: 5
Autores: Niklitschek, Edwin J.; Darnaude, Audrey M.
Background: Mixture models (MM) can be used to describe mixed stocks considering three sets of parameters: the total number of contributing sources, their chemical baseline signatures and their mixing proportions. When all nursery sources have been previously identified and sampled for juvenile fish to produce baseline nursery-signatures, mixing proportions are the only unknown set of parameters to be estimated from the mixed-stock data. Otherwise, the number of sources, as well as some/all nursery-signatures may need to be also estimated from the mixed-stock data. Our goal was to assess bias and uncertainty in these MM parameters when estimated using unconditional maximum likelihood approaches (ML-MM), under several incomplete sampling and...
Tipo: Text
Palavras-chave: Otolith chemistry; Mixture models; Mixed stocks; Mixing proportions; Mixing models; Stock identification; Stock structure; Fish stocks; Population structure; Sparus aurata.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00625/73753/74388.pdf

Les campagnes de chalutages expérimentaux en mer du Nord
Provedor de dados: 5
Autores: 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

Combined effects of exploitation and temperature on fish stocks in the Northeast Atlantic
Provedor de dados: 5
Autores: 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

Campagnes expérimentales de chalutage en mer du Nord et Manche Orientale. Volume I. Les campagnes I.B.T.S. 1997 &amp; 1998
Provedor de dados: 5
Autores: 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

Evaluation et cartographie de l'abondance du stock de la sardinelle ronde dans la zone Nord Ouest Africaine
Provedor de dados: 20
Autores: 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

Análise do manancial e da pescaria de Magumba, Hilsa kelee (Cuvier, 1829) na Baía de Maputo, Moçambique, no período de 1992-2010
Provedor de dados: 20
Autores: 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

Potential fishery resources and present state of exploited stocks
Provedor de dados: 20
Autores: Ssentongo, G.W.
FAO CECAF
Tipo: Book Section
Palavras-chave: Fish stocks; Fishery resources.
Ano: 1987
URL: http://hdl.handle.net/1834/682

Towards the development of environmental indices for the Namibian shelf, with particular reference to fisheries management.
Provedor de dados: 20
Autores: 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

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
Provedor de dados: 20
Autores: 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

The United Nations Fish Stocks Agreement
Provedor de dados: 20
Autores: 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

Détermination de la composition spécifique d'un banc de poissons pélagiques pêchés dans la ZEE ivoirienne.
Provedor de dados: 20
Autores: 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

Length-weight relationship and condition factor of eight fish species from the upper Araguari River, State of Amapá, Brazil
Provedor de dados: 3
Autores: 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