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Registros recuperados: 27
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A Developing Country Puts A Halt To Foreign Overfishing OceanDocs
Nichols, P..
Foreign fishing fleets drastically overfished the waters off Namibia before that country gained independence in 1990, according to Paul Nichols, Special Adviser to the Namibian Ministry of Fisheries and Marine Resources. Since then, the Government has taken strong regulatory actions that have brought overfishing under control and allowed depleted fish stocks to rebuild while gaining strong support for the policy among Namibia's commercial fishers.
Tipo: Journal Contribution Palavras-chave: Overfishing.
Ano: 2003 URL: http://hdl.handle.net/1834/637
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Análisis secuencial de la población de merluza de cola (Macruronus magellanicus)en el atlantico sudoccidental período 1985-1995. OceanDocs
Wöhler, O.C.; Giussi, A.R.; Hansen, J.E..
Sequential population analysis on Long Tail Hake (Macruronus magellanicus)from the Southwest Atlantic. Years 1985-1995. VPA on the Long Tail Hake (Macruronus magellanicus), based on data covering the years 1985 up to 1995, was performed to assess the current state of the stock. Simulation trials, inducing uncertainty about both the natural mortality rate and recruitment were also accomplished, to evaluate the risk of overfishing which is associated to different fishing alternatives, always under the assumption of a single and closed Long Tail Hake population. CPUE data were not appropriate for tunning, so the traditional VPA has been applied. During the period of study, stock biomass and spawning stock biomass showed an increased trend. Long and short-term...
Tipo: Journal Contribution Palavras-chave: Stock assessment; Fishery management; Catch/effort; Fishing mortality; Overfishing; Biomass; Sexual maturity; Stock assessment; Fishery management; Biomass; Overfishing; Sexual maturity; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_24026; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_34068; Http://aims.fao.org/aos/agrovoc/c_7016.
Ano: 1999 URL: http://hdl.handle.net/1834/1875
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Analysis of the management of the sardine crisis Sardinella aurita in Venezuela and commentary on fishing gears and statistics Boletín de Investigaciones
Gómez Gaspar,Alfredo.
ABSTRACT The sardine Sardinella aurita, fished since 1927, is Venezuela's most significant fishery resource. The national catch reached a record high of 200,000 tons in 2004 but diminished nationally by 50% in 2005 and by 90% on Margarita Island, marking the beginning of a crisis in sardine fishing. Based on indicators of overexploitation, the fishing authority increased the minimum size required for capture and prohibited fishing for three months in 2013. The validity of these measures is studied here. A reduction in size may indicate intensive exploitation, and thus, the records of 28,217 sardines measured between 2002 and 2016 in the southeast region of Margarita Island were examined. Prior to the crisis, in 2003 and 2004, the average size was 195.48...
Tipo: Journal article Palavras-chave: Sardinella; Overfishing; Maturity; Management; Venezuela.
Ano: 2018 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612018000100085
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Aplicación de un modelo dinámico de biomasa para evaluar el efectivo sur de merluza. Período 1986-1998 OceanDocs
Irusta, G.; Hernandez, D.R..
The status of hake (Merluccius hubbsi) resource south of 41°S in the Argentine Sea was evaluated with the Biomass Dynamic Model of Pella and Tomlinson. Results indicate that the population was overexploited and in a low biological production level (B99 BMSY1 because, as of 1998, catches always exceeded the surplus production corresponding to each year and the (MSY) Maximum Sustainable Yield. In 1993 increase of landings accelerated declination of biomass. For 1999 the MSY was estimated at 244,773 t and the replacement catch at 147,389 t. Landings corresponding to 1998 surpassed the MSY in 145,000 t and the replacement catch in 242,611 t.
Tipo: Journal Contribution Palavras-chave: Gadoid fisheries; Stock assessment; Overfishing; Biomass; Yield; Stock assessment; Biomass; Overfishing; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_34068.
Ano: 2003 URL: http://hdl.handle.net/1834/2425
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Assessment of sábalo (Prochilodus lineatus) fisheries in the lower Paraná River basin (Argentina) based on hydrological, biological, and fishery indicators Neotropical Ichthyology
Baigún,Claudio; Minotti,Priscilla; Oldani,Norberto.
This study assesses the change in fish exploitation patterns of the sábalo fisheries of the lower Paraná River basin based on hydrological, biological, and fishery indicators. From historical catch records, we recorded a shift from a lightly and moderate exploited status before 2001 to a heavily exploited one, as a result of the development of sábalo exports from 2001 onwards. Channel and floodplain connectivity indices demonstrated that the Paraná exhibited highly favorable hydrological conditions between 1972 and 1999 but more adverse conditions from 1999 to 2009, as a consequence of flood pulses reduction coincident with a fishing mortality increment. A total catch of 15,000 tons, including local consumption, regional market, informal sales, and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Artisanal fisheries; Flood pulse; Neotropical rivers; Overfishing.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000100199
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Bio-écologie des cétacés et enjeux de leur conservation pour les Etats côtiers africains comme le Sénégal OceanDocs
Ndao, Ibrahima.
Tipo: Theses and Dissertations Palavras-chave: Whaling; Anatomy; Morphology (biology); Physiology (fish); Preservation (fishery products); Biodiversity; Baleens; Migrations; Reproductive cycle; Fish consumption; Overfishing; Pollution.
Ano: 2006 URL: http://hdl.handle.net/1834/5005
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Canary Current : Under threat from the super-net OceanDocs
Griffith, L..
As over-fishing leads to catch restrictions in some parts of the world, government-subsidized commercial fleets are turning to the rich waters off West Africa. That is bad news for countries such as Mauritania - and for the marine environment
Tipo: Other Palavras-chave: Marine environment; Overfishing.
Ano: 1998 URL: http://hdl.handle.net/1834/645
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Couplage de modèles trophiques et effets combinés de la pêche et du climat ArchiMer
Travers, Morgane.
Overfishing and climate change are now recognized to have important effects on marine ecosystem functioning but uncertainties remains about their combined effects. Using a modelling approach this thesis aims at assessing how the top-down effects of fishing and the bottom-up effects of climate combine themselves within the food web. A preliminary review highlighted the lack of end-to-end model applicable as it stands to our study case - the southern Benguela - and suitable to study the combined effects of fishing and climate. Coupling the plankton model ROMS-N2P2Z2D2 and the fish model OSMOSE appeared as an innovative method allowing to develop an appropriate tool meeting our objectives. The importance of two-way coupling via the predation process is first...
Tipo: Text Palavras-chave: Modèle end-to-end; Couplage de modèle; Réseau trophique; Sud- Benguela; Effets combinés; Changement climatique; Surexploitation; End-to-end model; Model coupling; Food web; Southern Benguela; Combined effects; Climate change; Overfishing.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00003/11445/7993.pdf
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Dynamique socio-environnementale et gestion des ressources halieutiques des régions côtières du Sénégal : l’exemple de la pêche artisanale: Rapport final OceanDocs
Niang, Ndeye Astou.
UNESCO, bourses MAB/Jeunes scientifiques
Tipo: Theses and Dissertations Palavras-chave: Artisanal fishing; Artificial reefs; Ocean currents; Swell; Coastal erosion; Mesh regulations; Cephalopod fisheries; Overfishing; Hydroclimate; Environment management; Safety regulations; Aquaculture.
Ano: 2008 URL: http://hdl.handle.net/1834/4998
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Efectos del filtrado de datos sobre la estimación de la tendencia de los índices de abundancia de polaca (Micromesistius australis) OceanDocs
Cordo, H.D..
Catch per unit of effort (CPUE)analysis of the Argentine surimi fleet is a routine work to estimate abundance indices of southern blue whiting Micromesistius australis. Several analysis of this fishery suggest that, as of the years when intensive fishing by foreign and national fleets started, the resource has suffered a marked decline. When calculating the CPUE it is common practice to take into acount only trips and fishing operations with high catches of the target species fishing operations directed to other species are not considered to avoid underestimations. Therefore, in order to include a percentage of catch of the analyzed species higher than a subjective value, available data are filtered. However, because only operations with high yield are...
Tipo: Journal Contribution Palavras-chave: Catch/effort; Yield; Commercial fishing; Overfishing; Stock assessment; Stock assessment; Overfishing.
Ano: 2002 URL: http://hdl.handle.net/1834/1584
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Effects of subsidised distant water fleets on the marine environment and local people in Western Africa OceanDocs
Zeba, S..
These last years, while adressing marine conservation problems in Western Africa, 3 major issues were generally raised by our local partners: -Most of the distant water fleets fishing in the coastal waters of other countries do not often abide by the international standards of responsible fishing; -The number of distant water fleets is steadily increasing in the Exclusive Economic Areas of developing countries; -Theses fleets have tremendous ecological and economic consequences, which resulted in a crisis of fishery management. Yet it is thanks to fishing agreements that distant water fleets have legal access to the fish resources of developing coastal countries.More important: it is thanks to subsidies that the behaviours of distant water fleets have such...
Tipo: Report Palavras-chave: Distant water fisheries; Overfishing; Marine environment.
Ano: 2000 URL: http://hdl.handle.net/1834/650
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Estimación del nivel óptimo de mortalidad por pesca y riesgo de sobreexplotación de la castañeta (Cheilodactylus bergi) OceanDocs
Wöhler, O.C.; Cordo, H.D..
Patagonian scallop (Zygochlamys patagonica King & Broderip, 1832): A new fishery in the Argentine continental shelf. Yield-per-recruit model was applied to the stock of castañeta (Cheilodactylus bergi)in the Argentine-Uruguayan Common Fishing Zone (Southwest Atlantic, among 34° and 39°30' S), in order to estimate the range of F0.1 values resulting from the uncertainty in the parameters of the model. Simulations with variations in natural mortality and recruitment were carried out, in order to estimate the risk of overfishing associated with different fishing mortality levels. The criterion that spawning stock biomass be mantained over 35. of its unexploited level was adopted. For an optimum age of first capture of 4 years, the range of calculated F0.1...
Tipo: Journal Contribution Palavras-chave: Fishing mortality; Overfishing; Biomass; Yield; Biomass; Overfishing; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_34068.
Ano: 1999 URL: http://hdl.handle.net/1834/1873
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Estratificación de la flota industrial de buques fresqueros y estimación de los rendimientos OceanDocs
Bertolotti, M.I.; Pagani, A.N.; Hernandez, D.R.; Buono, J.J..
In order to increase knowledge about the ice chilling fleet and to explain the relationship between structural variables and yields, a simplified model was developed. The fleet was classified in three homogeneous strata. Stratum I includes the smallest ships, with a catch composition equal to that of the large coastal fishing vessels. The stratum yields decreased in 1997 and 1998. Strata II and III have common hake as the main target of catches. Yields of those strata showed a continuous decrease as of 1994/1995. Therefore, the species was replaced by other fish originally caught by other fleets. These two last strata are more vulnerable to overfishing of traditional coastal and demersal fisheries.
Tipo: Book Section Palavras-chave: Fishery economics; Overfishing; Fish catch statistics; Yield; Fishing vessels; Overfishing; Fishing vessels; Http://aims.fao.org/aos/agrovoc/c_34068; Http://aims.fao.org/aos/agrovoc/c_2954.
Ano: 2001 URL: http://hdl.handle.net/1834/2586
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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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Evaluation des stocks et aménagement des pêcheries de la ZEE mauritanienne OceanDocs
Diop, M.; Inejih, C.A.O.; Tous, P.; Failler, P.; Dia, M.A..
Le cinquième groupe de travail destiné à l’évaluation des stocks et l’aménagement des pêcheries de la zone économique exclusive mauritanienne s’est réuni à l’Institut Mauritanien de Recherches Océanographiques et des Pêches (IMROP) du 9 au 17 décembre 2002. Les objectifs de ce groupe de travail étaient d’actualiser les résultats des groupes de travail précédents, en utilisant les nouvelles informations disponibles ; d’établir un diagnostic des différents stocks et pêcheries afin de définir les potentiels de capture ainsi que les caractéristiques de l’effort permissible et d’évaluer l’impact des mesures d’aménagement actuellement en vigueur et identifier les perspectives à venir. Les résultats obtenus ont contribué à la formulation de recommandations...
Tipo: Journal Contribution Palavras-chave: Artisanal fishing; Catch composition; Catch statistics; Catch/effort; Cephalopod fisheries; Coastal fisheries; Demersal fisheries; Economic analysis; Environmental conditions; Fishery economics; Fishery management; Fishing effort; Fishing fleet; Landing statistics; Marine environment; Overfishing; Pelagic fisheries; Population dynamics; Prices; Quality assurance; Quality control; Research institutions; Research vessels; Seasonal distribution; Seasonal variations; Shrimp fisheries; Socioeconomic aspects; Upwelling; Demersal fisheries; Economic analysis; Fishery management; Marine environment; Prices; Research vessels; Catch composition; Coastal fisheries; Environmental conditions; Fishing effort; Overfishing; Pelagic fisheries; Population dynamics; Quality assurance; Research institutions; Http://aims.fao.org/aos/agrovoc/c_2173; Http://aims.fao.org/aos/agrovoc/c_2469; Http://aims.fao.org/aos/agrovoc/c_24026; Http://aims.fao.org/aos/agrovoc/c_4610; Http://aims.fao.org/aos/agrovoc/c_6178; Http://aims.fao.org/aos/agrovoc/c_6516; Http://aims.fao.org/aos/agrovoc/c_1384; Http://aims.fao.org/aos/agrovoc/c_1696; Http://aims.fao.org/aos/agrovoc/c_32980; Http://aims.fao.org/aos/agrovoc/c_24027; Http://aims.fao.org/aos/agrovoc/c_34068; Http://aims.fao.org/aos/agrovoc/c_5659; Http://aims.fao.org/aos/agrovoc/c_6111; Http://aims.fao.org/aos/agrovoc/c_35287; Http://aims.fao.org/aos/agrovoc/c_6514.
Ano: 2005 URL: http://hdl.handle.net/1834/1322
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Flota pesquera Argentina. Evolucion 1960-1998 con una actualizacion al 2000. OceanDocs
Bertolotti, M.I.; Verazay, G.A.; Pagani, A.N.; Errazti, E.; Buono, J.J..
The analysis of the Argentine fishing fleet (SW Atlantic) evolution as of 1960 allows to explain the major causes of expansion, the crisis in the fisheries and the structural changes of the fleet during the 90's. Different fleet classification criteria focused on fishing capacity, fish landing composition, yields and productivity indices are described. The expansion cycles were associated to the incorporation of fishing vessels, while the 1960-1989 crisis originated in domestic and international economic crisis and changes in the strategy pattern of the fishing countries. The latter was related to overfishing of traditional coastal and demersal fisheries and to the full exploitation of resources such as squid, blue whiting and toothfish incorporated to the...
Tipo: Book Section Palavras-chave: Fishing vessels; Fishery economics; Fishing vessels statistics; Overfishing; Landing statistics; Catch/effort; Yield; Fishing vessels; Overfishing; Http://aims.fao.org/aos/agrovoc/c_2954; Http://aims.fao.org/aos/agrovoc/c_34068.
Ano: 2001 URL: http://hdl.handle.net/1834/2587
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La depredación de la merluza en la Argentina. Incentivos políticos y conservación de los recursos naturales OceanDocs
Litovsky, A..
El tema de las pesquerías forma parte de la temática del medio ambiente, pero más específicamente de la del desarrollo sustentable. Esta se refiere al impacto que produce la actividad humana sobre el medio ambiente, en este caso la explotación de un recurso renovable, y a las consecuencias que ello tiene, entre otras cosas, para el desarrollo de esa actividad sostenida en el tiempo. Esta temática es compleja ya que involucra diferentes aspectos de la organización social, que se relacionan entre sí e interactúan con la naturaleza. Por ejemplo, el incremento de la capacidad pesquera mundial no puede ser entendido independientemente de la dimensión política que permite o incentiva ese desarrollo. A pesar de que el problema se ha agudizado en la última década,...
Tipo: Theses and Dissertations Palavras-chave: Gadoid fisheries; Overfishing; Fishery policy; Fishery legislation; Socioeconomic aspects; Depleted stocks.
Ano: 2000 URL: http://hdl.handle.net/1834/4206
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La depredación de la merluza en la Argentina. Incentivos políticos y conservación de los recursos naturales OceanDocs
Litovsky, A..
Tipo: Theses and Dissertations Palavras-chave: Gadoid fisheries; Overfishing; Fishery policy; Fishery legislation; Socioeconomic aspects; Depleted stocks.
Ano: 2000 URL: http://hdl.handle.net/1834/4301
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Le Polymorphisme Electrophoretique : Un Moyen d'Etude des Populations. ArchiMer
Pichot, Paul; Pichot, Yves.
The study of biochemical polymorphisms has been known for some years as an important development. The use of a technique called electrophoresis is at the origin of the progress realized in this science. The electrophoretic detection of genetical heterogeneity existing at the level of some biochemical characters of animal species presents an important theorical and practical interest.
Tipo: Text Palavras-chave: Pisces; Overfishing; Stock assessment; Population genetics; Electrophoresis; Biochemical analysis; Analytical techniques.
Ano: 1980 URL: http://archimer.ifremer.fr/doc/1980/publication-1909.pdf
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Les dimensions sociologiques de la crise de surcapacité de la pêche artisanale sénégalaise OceanDocs
Diagne, M..
Sans nier le rôle par "le libre accés", cet article assaie de mettre en exergue les facteursd'ordre sociologique qui ont contribué à la surcapacité de la pêche artisanale sénégalaise
Tipo: Journal Contribution Palavras-chave: Artisanal fishing; Overfishing; Overfishing; Http://aims.fao.org/aos/agrovoc/c_34068.
Ano: 2006 URL: http://hdl.handle.net/1834/2460
Registros recuperados: 27
Primeira ... 12 ... Última
 

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