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Registros recuperados: 235
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A comparative study on the feeding habits of Oreochromis niloticus (Linnaeus) in Nyanza Gulf Lake Victoria and sewage fish ponds OceanDocs
Getabu, A..
Gut content analysis of Oreochromis niloticus from the Nyanza Gulf, Lake Victoria showed that the bulk of the food items ingested constituted bottom deposits and blue green algae. Among the live food items ingested, blue green algae (Cyanophyceae) constituted 53.6%, the diatoms (Bacillariophyaceae) 19.7%, aquatic invertebrates (mainly Copepoda, Cladocera, and Rotifera) 12.9%, desmids (Desmidaceae) 7.7% and lastly the green algae (Chlorophyceae) 6.2%. The most preferred food items were: Spirulina laxisma and Nitzschia accicularis. The least preferred food items were: Lyngbya circumcreta, Microcystis aeruginosa and Pediastrum simplex. The quantity of food eaten by O. niloticus to satiation ranged from 0.016-4.5% body...
Tipo: Proceedings Paper Palavras-chave: Oreochromis niloticus; Feeding behaviour; Fish ponds; Food organisms; Sewage; Feeding behaviour; Fish ponds; Sewage; Http://aims.fao.org/aos/agrovoc/c_10778; Http://aims.fao.org/aos/agrovoc/c_2929; Http://aims.fao.org/aos/agrovoc/c_7007.
Ano: 1994 URL: http://hdl.handle.net/1834/1160
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A habitat-based simulation framework to design tag-recapture experiments for tunas in the Indian Ocean. Application to the skipjack (Katsuwonus pelamis) population. OceanDocs
Olivier, M.A.Y..
The IOTC initiated a discussion to organize a large scale tagging program concerning the major tropical tuna species and fisheries. According to the terms of reference for the working party on tagging (Anon., 1999), prospective simulations are needed to help designing tag -recapture experiments. The purpose of this paper is to present the methodology developed to help designing the future tagging program. It is based on three stages: tag recovery simulations with an habitat -based advection-diffusion-reaction model; bootstrapping of the recovery data sets; population parameter estimation and comparison of scenarii. Different scenarii are studied to check the reliability of the method and its ability to compare various t agging experimental designs....
Tipo: Proceedings Paper Palavras-chave: Tagging Stock assessment Tuna fisheries Marking ISW; Indian Ocean.
Ano: 1998 URL: http://hdl.handle.net/1834/67
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Acadja fisheries enhancement systems in Benin: their productivity and environmental impacts OceanDocs
Laleye, P..
Universite Nationale du Benin
Tipo: Proceedings Paper Palavras-chave: Artisanal fishing.
Ano: 2000 URL: http://hdl.handle.net/1834/730
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Accords de pêche UE-Sénégal et commerce international Respect des réglementations internationales, gestion durable des ressources et sécurité alimentaire OceanDocs
Dahou, K.; Dème, M..
Tipo: Proceedings Paper Palavras-chave: Fishery regulations; Fishery economics; Fishery management; Food security; Sustainable management; Food safety; Http://aims.fao.org/aos/agrovoc/c_33995.
Ano: 2001 URL: http://hdl.handle.net/1834/197
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ACP-EU Fisheries Research Initiative. OceanDocs
The present report contains the proceedings of the INCO-DEV International Workshop on Information Systems for Policy and Technical Support in Fisheries and Aquaculture, convened in Los Baños, Philippines, 5 -7 June 2000. It was convened to address issues associated with the difficult transition from abundance to scarcity in aquatic resources. Reliable information will spread the right perception of the productive capacity and result in more realistic assessment of decreasing benefits and rising costs. Conservation of aquatic biodiversity, ecosystem approaches to fisheries and aquaculture production and food quality and safety along the entire chain from production to the consumer are key concepts that will govern approaches to aquatic living resources in...
Tipo: Proceedings Paper Palavras-chave: International cooperation.
Ano: 2001 URL: http://hdl.handle.net/1834/883
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ACP-EU Fisheries Research Initiative. OceanDocs
This report presents the proceedings of a five day scientific conference on “Placing Fisheries in their Ecosystem Context”, held on 4-8 December 2000, at the Charles Darwin Research Station, Puerto Ayora, Galápagos Islands. The conference was hosted by the Charles Darwin Foundation for the Galápagos Islands and co-organized by Instituto de Ecologia Aplicada, Universidad San Francisco de Quito, Ecuador; the Charles Darwin Research Station, Ecuador; and the North Sea Centre, Denmark. The conference as made possible through support from the European Commission's INCO-DC Concerted Action programme ERBIC18CT97175. The conference was based on the recognition that the sustainability of fisheries worldwide depends on the maintenance of the ecosystems in which they...
Tipo: Proceedings Paper Palavras-chave: International cooperation.
Ano: 2002 URL: http://hdl.handle.net/1834/884
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ACP-EU Fisheries Research Initiative. OceanDocs
This report presents the papers discussed at an EC/INCO-DC-sponsored international workshop ‘Markets, Global Fisheries and Local Development’ held on March 22 and 23, 1999 at the Chr. Michelsen Institute (CMI), Bergen, Norway. The main objective of the workshop was to initiate a debate on how markets impact on global fisheries, and how these in turn impact on the ability of developing fishing nations to improve the welfare of their citizens. The motivation for the workshop stems from the observation that over time two things have happened to the world’s fishing sector. First, through improvement in fishing technology and the activities of distant water fishing fleets, fish exploitation and harvest have become global. Second, with significant technological...
Tipo: Proceedings Paper Palavras-chave: International cooperation.
Ano: 2000 URL: http://hdl.handle.net/1834/882
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African Aquaculture: A Regional Summary with Emphasis on Sub-Saharan Africa OceanDocs
Moehl, J.; Machena, C..
The African Region consists of 48 countries and five island nations, most of which are practising some form of aquaculture, often at a very low level. Over half the countries report producing less than 100 mt annually. The largest producer is Nigeria (17 700 mt) followed by Madagascar (5 100 mt) and Zambia (4 700 mt). The 1997 combined aquaculture production of the region was 40 300 mt. Aquaculture is estimated to be 95 percent small scale, with fish ponds integrated into the mosaic of agricultural activities. Mean yield is approximated as 500 kg/ha/yr, although the range is wide, from less than a hundred to more than 10 000 kg/ha/yr. A typical scenario would be a 300 m2 pond producing 15 kg a year relying on family labour and on-farm inputs. There is...
Tipo: Proceedings Paper Palavras-chave: Fish Farming; Aquaculture; Sub-Saharan Africa; Development; Africa; Aquaculture.
Ano: 2000 URL: http://hdl.handle.net/1834/371
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African Fisheries: Major Trends and Diagnostic of the 20th Century OceanDocs
Njock, J.C.; Njifonjou, O..
The marine fisheries production from African coastal countries, combined with that of freshwater production of the continent is estimated to be 6 millions metric tons, corresponding only 5 % of the total world production. Africa's contribution to fisheries products (1,5 %) is insignificant compared to that of world commerce which is around 44 millions tons. This deplorable situation is due to a certain number of problems which include s among others, the relative biogenic poverty of African waters, the exploitation of African waters by foreign vessels, the total lack of catches effected by the African vessels out of their regional boundaries, the lack of knowledge on the mastering of commercialisation and on veritable commercial politics of fisheries...
Tipo: Proceedings Paper Palavras-chave: Fisheries.
Ano: 2000 URL: http://hdl.handle.net/1834/839
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Alternativas para obtener alimentos más eficientes en el engorde semintensivo del camarón blanco (Litopenaeus Schmitti) OceanDocs
Alvarez, S.; Garcia, T.; Villareal, H.; Galindo, J.; Fraga, I.; Pelegrín, E..
Se desarrollaron cuatro diseños experimentales completamente aleatorizados. El primero se realizó a escala de laboratorio, en cajas plásticas de 40L de capacidad y 10 juveniles/caja, para evaluar la respuesta de los camarones ante la sustitución parcial y total de la harina de pescado por soya en la dieta, teniendo como control la fórmula empleada en el engorde a escala comercial.
Tipo: Proceedings Paper Palavras-chave: Prawn culture; Diets; Animal growth.
Ano: 2004 URL: http://hdl.handle.net/1834/1881
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An integrated river basin planning approach – Nyando case study in Kenya OceanDocs
Njogu, A.K..
The river basin has long been acknowledged as the appropriate unit of analysis for water resources management and has also been named by the United Nations Conference on Environment and Development (UNCED 1992) as the logical unit for integrated water resources management in Agenda 21, chapter 18. The comprehensive methodology framework for analysis structures the decision making process, starting with the problem identification, through the weighing of various options to the final selection of the most appropriate policy. The integrated planning approach methodology is applied to the 3600 km2 Nyando river basin in western Kenya, one of the sub-basins that drain into Lake Victoria in Eastern Africa. Statistical methods used to check the adequacy and...
Tipo: Proceedings Paper Palavras-chave: Integrated river basin planning; Integrated water resources management; Institutional arrangements Resource management River basins Resource management River basins http://aims.fao.org/aos/agrovoc/c_6524 http://aims.fao.org/aos/agrovoc/c_6613.
Ano: 2002 URL: http://hdl.handle.net/1834/1293
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An Ocean Theme for the IGOS Partnership OceanDocs
The Integrated Global Observing Strategy Partnership (IGOS-P) established, in 1999, a thematic approach to the implementation of the IGOS. Recognising that other themes will emerge, the “Ocean Theme” was chosen to be the “pathfinder” in this approach and an Ocean Theme Team was assembled to formulate guidance. One goal of the Ocean Theme Team is to consider and study the full range of current and planned observations, while identifying potential gaps in future observations that might compromise ocean observational records. This document presents a proposed set of long-term ocean observations and identifies a number of challenges for the improvement of knowledge about both the oceans and observing techniques. The overall strategy is to create an observing...
Tipo: Proceedings Paper Palavras-chave: Oceanography; Surface temperature; Wind vectors; Sea ice; Salinity; Salinity; Http://aims.fao.org/aos/agrovoc/c_6751.
Ano: 2000 URL: http://hdl.handle.net/1834/2631
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Análisis de contaminantes inorgánicos tóxicos en las aguas del Rio Almendares, Cuba OceanDocs
Rodríguez, A.J.; Arpajón, I.; Castaño, Z.; Marsán, R.; Lugo, D.; Roevros, N.; Chou, L.; Rojas, N.; Heydrich, M..
The Almendares River constitutes the most important superficial stream in Cuban capital, that finishes in the Metropolitan Park of Havana, which is an entertaining centre. The objective of this work is to determine the presence of toxic inorganic pollutants in the Almendares River water. 10 samplings were carried out from June 2003 to May 2004 in 14 stations established along the last 10 km of the river and 3 tributaries. The quantification of nitrates, nitrites and ammonium was done by spectrophotometric methods The concentration of heavy metals in the dissolved and particulate phase was determined by atomic emission spectrometry. The total microbial charge was determined by epifluorescency. Were found high levels of ammonium and nitrites, as well as high...
Tipo: Proceedings Paper Palavras-chave: Rivers; Freshwater pollution; Heavy metals; Rivers; Heavy metals; Http://aims.fao.org/aos/agrovoc/c_6617; Http://aims.fao.org/aos/agrovoc/c_2223.
Ano: 2006 URL: http://hdl.handle.net/1834/2086
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Analysis and prediction of yellowfin tuna (Thunnus albacares) catch rates of longline fisheries in the western Indian Ocean using a neural network. OceanDocs
Nishida, T.; Komatsu, T..
Strengthening tuna management is one of the primary tasks for the new Indian Ocean Tuna Commission (IOTC). Stock assessment and the prediction of the dynamics of the tuna resources will become increasingly important research topics because they provide the basic information for the management decision process. Under these circumstances, this paper attempts to develop the stock analyses and prediction techniques using neural networks. As a first step and as a test study, analyses and predictions of catch rates of the Japanese yellowfin tuna longline fisheries are attempted.
Tipo: Proceedings Paper Palavras-chave: Fishery management; Stock assessment; Catch/effort; Tuna fisheries.
Ano: 1998 URL: http://hdl.handle.net/1834/60
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Analysis of small-scale movements of yellowfin tuna around fish-aggregating devices (FADS) using sonic tags OceanDocs
Marsac, F.; Cayré, P.; Conand, F..
The ongoing ultrasonic experiments of phase 2 of the Regional Tuna Project (Commission de l'Ocean Indien) are reported and analysed in relation to the local environmental parameters. Although 7 yellowfin tuna (Thunnus albacares) were tagged during the first 3 cruises of the project, only 5 of them are considered in this paper, as they were tracked around FADs. Seasonal trends affect the horizontal movements associated with FADs: strong association and homing behaviour during the fishing season vs. weaker association when the fishing season comes to an end and the fish start migrating from the area. The vertical movements are analysed in order to provide a typology of the distribution of tuna in relation to different features (FAD association by day and at...
Tipo: Proceedings Paper Palavras-chave: Tuna fisheries Fishery surveys Tagging Sonic tags Local movements Migrations Environmental conditions Thunnus albacares ISW; Indian Ocean.
Ano: 1996 URL: http://hdl.handle.net/1834/16
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Apatite Fission Track Analysis of Sites 959 and 960 on the Transform Continental Margin of Ghana, West Africa OceanDocs
Carter, A.; Clift, P.D.; Hurford, A.J..
Four samples of sandstone from deformed Aptian–Albian sediments and their less deformed Turonian cover at Sites 959 and 960 on the Côte d’Ivoire-Ghana Marginal Ridge yielded sufficient apatite for fission track analysis. Reduced mean track length values of 12.42 ± 0.16 μm to 13.67 ± 0.11 μm indicate that measured central ages, which range from 88 ± 4 Ma to 113 ± 4 Ma, have undergone partial resetting and are therefore apparent ages. Stochastic modeling of the fission track age and length parameters indicate that the samples have a strong predepositional signal, slightly modified by minor levels of prolonged postdepositional annealing (maximum temperatures <80°C). The preserved provenance-related signal records cooling through the apatite partial...
Tipo: Proceedings Paper Palavras-chave: Geology.
Ano: 1998 URL: http://hdl.handle.net/1834/444
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Aporte contaminante de las aguas residuales de la industria pesquera cubana y su impacto sobre el ecosistema OceanDocs
Romero López, T..
The present paper involves their results in the pollutant contributions to the aquatic ecosystems according to the products processed in different productive facilities of the Cuba Island, and concerning to the most significant fishing resources as lobster, white shrimp, tuna, shark, snapper, mackerel, jack and bill fish. The polluting loads in 12 years (between 1955 and 1999) respond to the indicators BOD, QOD, TP, TNK and N-NH4. The captures for those years were approximately between 3 950 and 23 970 tons, with fluctuations of BOD loads between 56 and 342 tons and of DQO between 111 and 676 tons. The principal nutrients contribution was the nitrogen, followed by the phosphorous and finally the ammonium, representing a total contribution of 136,3; 52,7...
Tipo: Proceedings Paper Palavras-chave: Fishery industry; Waste water; Environmental impact; Waste water; Environmental impact; Http://aims.fao.org/aos/agrovoc/c_24927; Http://aims.fao.org/aos/agrovoc/c_24420.
Ano: 2006 URL: http://hdl.handle.net/1834/2083
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Aquaculture genetics research in Egypt OceanDocs
Elghobashy, H..
Fish production in Egypt has significantly increased over the last few years reaching 546 000 t in 1998 compared to 306 000 t in 1988. The contribution of aquaculture in the overall fish production has increased as well reaching its utmost share in 1998 (26%). Research on aquaculture topics was conducted in several institutes targeting the increase of productivity as well as working on problems facing this promising sector. However, research on fish genetics in Egypt only started in recent years. The genetic improvement of tilapias and African catfish represents the focus of most genetics research in Egypt. This paper presents the status of genetics research within the International Network on Genetics in Aquaculture and in other national institutes in...
Tipo: Proceedings Paper Palavras-chave: Genetics; Genetics; Http://aims.fao.org/aos/agrovoc/c_3222.
Ano: 2001 URL: http://hdl.handle.net/1834/845
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Arrecifes de coral: un potencial económico, turístico y educacional OceanDocs
Olaechea-Juárez, A.; González, E.; Guitart-Pérez-Puelles, B..
Los arrecifes de coral son utilizados en dos formas principales: la extractiva y la no-extractiva. La forma extractiva incluye la captura de las especies que en él habitan, tales como peces, langostas, cangrejos, etc., así como en la colecta de productos con fines ornamentales, como esponjas, conchas y otros. La forma no extractiva se basa en la utilización del arrecife con fines de recreación, científicos y educacionales. La protección de los corales es de vital importancia para los hombres. El papel de los acuarios en promover su preservación a través de la exhibición y del uso del buceo contemplativo, es sumamente importante. Las maravillas que ofrecen nuestros mares y en particular los arrecifes coralinos, constituyen...
Tipo: Proceedings Paper Palavras-chave: Coral reefs; Tourism; Educa.
Ano: 1994 URL: http://hdl.handle.net/1834/4659
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Atelier de Kayar OceanDocs
Dioh, B.; Ndiaye, O.; Sané, K.; Diouf, P.S..
ATELIER DE FORMATION SUR L'APPLICATION DES LOIS ET REGLEMENTS AU CONTEXTE DE LA PECHERIE MARITIME DE KAYAR Introduction Dans le programme de conservation des écosystèmes marins et côtiers de I'Akique de I'Ouest du World Wide Fund for Nature (WWF), Kayar a été retenu comme site où des activités de terrain doivent être menées. Dans le but de former et de sensibiliser les acteurs chargés de I'application des lois et règlements relatifs à la pêche et ceux à qui cette réglementation s'applique, une séance de vulgarisation des lois et règlements régissant la pêche au Sénégal a été organisée le 26 juillet 2002 à Kayar. Aprés la cérémonie d'ouverture, Messieurs Ousmane NDIAYE, Chef de la division pêche artisanale à la Direction de l'océanographie et des pêches...
Tipo: Proceedings Paper Palavras-chave: Fish consumption; Fish counters; Fish culture; Law of the sea; Licences; Fish culture; Licences; Http://aims.fao.org/aos/agrovoc/c_2918; Http://aims.fao.org/aos/agrovoc/c_4313.
Ano: 2002 URL: http://hdl.handle.net/1834/1709
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