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| Registros recuperados: 5.192 | |
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| Nyunja, J.A.; Mavuti, K.M.; Wakwabi, E.. |
| The food habits of two schooling planktivorous fishes, Sardinella gibbosa and Atherinomorous lacunosus, were investigated in Mtwapa creek and Wasini Channel of the Kenya coast. Spatial and temporal variations in their food and feeding habits were assessed using the percentage numerical abundance method, percentage frequency of occurrence, stomach fullness indices and the Tokeshi graphical method. This study established a clear spatial separation of Mtwapa creek from Wasini Channel in terms of the abiotic and biotic data. Highly significant differences (t-test, p < 0.05) were observed between the two study areas in temperature, salinity, transparency, conductivity, chlorophyll a and in zooplankton abundance and diversity. The diet of the two fish species... |
| Tipo: Journal Contribution |
Palavras-chave: Ecology Marine fishes Habitat selection ISW; Kenya. |
| Ano: 2002 |
URL: http://hdl.handle.net/1834/40 |
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| Artisanal fishing in Africa, historically dominated by fishermen in canoes and boats who set out to sea from small coastal fishing villages in search of bonga, sardinella and other pelagic fish, has provided a nutritious source of food often cheaper than meat. As a result, fish has been consumed by large portions of the population and has become a diet staple. Today, however, some African fisheries, including the bonga (Ethmalosa fimbriata), which is widely harvested and eaten by west Africans, suffer from periods of excess harvest or glut, particularly during the peak season between November and May. Because most fishing communities do not have ice-storage facilities, the daily catch is either sold fresh or smoke-dried before it spoils.... |
| Tipo: Report |
Palavras-chave: Artisanal fishing. |
| Ano: 1999 |
URL: http://hdl.handle.net/1834/838 |
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| Ben Mouelli, I.; Bejaoui, B.; Raïs, S.; Brahim, M.. |
| Ce travail s’intéresse à l’étude de l’évolution et de la protection du littoral de la banlieue Nord de Tunis par modélisation à l’aide du code UNIBEST. Pour ce faire, une étude bibliographique a été élaborée concernant la morphologie des côtes, les facteurs naturels (houle, marée) l’influençant ainsi que les différents ouvrages de protection utilisés. L’étude du littoral de la banlieue Nord de Tunis a nécessité la subdivision de la région en zones d’étude afin de valider les hypothèses de base du modèle UNIBEST. La procédure de calage est effectuée seulement sur une zone. La modélisation de l’évolution du littoral de la banlieue Nord de Tunis a montré l’existence de deux sites menacés par l’érosion : Le premier site correspond à la côte de Gammarth entre... |
| Tipo: Journal Contribution |
Palavras-chave: Breaking waves; Breakwaters; Refraction; Mathematical models; Swell; Diffraction. |
| Ano: 2002 |
URL: http://hdl.handle.net/1834/242 |
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| Gutiérrez Delgado, A. R.; Alvarez Cruz, A.; Frías, M. del P.; Alfonso, I.. |
| Esta investigación muestra los efectos del evento ENOS 1997-1998 en la temperatura superficial del mar (TSM) y en la abundancia de larvas de peces de las familias Thunnidae, Carangidae y Lutjanidae en las aguas oceánicas adyacentes a Cuba. La data histórica está integrada por 37 cruceros oceanográficos realizados entre los años 1966 y 1999. De ellos, 3 cruceros fueron realizados bajo el efecto del ENOS 1997-1998 en los meses de diciembre de 1997, septiembre de 1998 y mayo de 1999. También fue utilizada la serie de TSM desarrollada en el Centro Meteorológico Nacional de la NOAA para la cuadrícula de Cuba 23º-24ºN y 74º-85ºO entre los años 1966 y 1999. Las anomalías térmicas de la TSM, durante septiembre de 1998, provocaron un aumento tanto de la... |
| Tipo: Book |
Palavras-chave: Temperature; Water levels; Spawning; Pelagic fish; Fish. |
| Ano: 2008 |
URL: http://hdl.handle.net/1834/5789 |
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| Mora-Cristancho, J.; Zea, S.; Gil-Agudelo, D.. |
| Las superficies sumerigdas en el mar son densamente colonizadas por bacterias y sus interacciones, tales como la inhibición del crecimiento, son importantes para determinar el desarollo de comunidades bactarinas, como también de posteriores etapas de las macroepibiosis. Para determinar el potencial de interacción entre bactarias de las biopelículas de esponjas, se realizaron ensayos de actividad de inhibición in vitro de crecimiento entre cepas bacterianas aisladas de superficies con diferente grado de macroepibiosis, de las esponjas Apysina insularis (limpia), Aplysina lacunosa (con macroepibiosis) y de la superficie calcárea de la concha del molusco bivalvo Donax sp. El procentaje total de interacción antagónica entre estas cepas bacterianas fue del 64... |
| Tipo: Journal Contribution |
Palavras-chave: Epibiosis; Sponges; Sponges; Http://aims.fao.org/aos/agrovoc/c_7321. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/3574 |
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| Derbali, A.; Jarboui, O.; Ghorbel, M.. |
| Le présent travail porte sur l’étude des caractères biométriques de l’huître perlière Pinctada radiata des îles de Kerkennah pour la différenciation entre les populations des deux sites El Kraten et El Jorf à partir d’un pouvoir discriminant des caractères métriques et méristiques. Durant l’année 2007, un total de 2360 et 2422 individus ont été collectés respectivement dans les sites d’El Kraten et d’El Jorf. Les résultats des comparaisons des moyennes et des variances des caractères biométriques à l’aide du test "F" de Fisher et du test "t" de Student plaident en faveur d’une discrimination entre les deux populations. De même, les résultats des analyses multivariées (l’Analyse en Composante Principale (ACP) et l’Analyse Factorielle Discriminante (AFD))... |
| Tipo: Journal Contribution |
Palavras-chave: Pearl oysters; Biometrics. |
| Ano: 2012 |
URL: http://hdl.handle.net/1834/5294 |
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| Akimova, Olga. |
| ODINECET Training Course on Marine Information Management (Intermediate level) was held at the UNESCO/IOC Project Office for IODE Oostende – Belgium (19 – 23 November 2007). This Training course was a continuation of intended instruction within the framework of the ODINECET project. The Training Course was attended by 13 participants from 7 countries including Bulgaria, Croatia, Estonia, Latvia, Poland, Russia and Ukraine. The main topic was dedicated to the creation of an ODINECET repository (CEEMaR – Central and Eastern Europe Marine Repository). |
| Tipo: Working Paper |
Palavras-chave: Ocean data. |
| Ano: 2008 |
URL: http://hdl.handle.net/1834/5556 |
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| Wilson, D.C.. |
| The present paper is based on a collation of information, through both a literature review and an internet search, on North American programs that involve some kind of scientific collaboration between fishers and fisheries scientists. It identifies four basic models of such collaboration and offers examples of collaborative activities that seem to fit into each of them. The first model defers to the expertise of the scientist for all major decisions and creates a strong programmatic distinction between what is science, and shall be done by scientists, and what are other, related activities that can be carried out by others. Various kinds of tagging programs, fisher advisory boards, at-sea research collaboration and many other activities fit this model. The... |
| Tipo: Conference Material |
Palavras-chave: Mariculture; Fisheries. |
| Ano: 1999 |
URL: http://hdl.handle.net/1834/620 |
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| Westmacott, Susie; Quod, J.P.. |
| CORDIO activities were conducted in seven of the Indian Ocean Islands namely, Comores, Madagascar, Mauritius, Mayotte, Réunion, Rodregues, and Seychelles. On each island biophysical and socio-economic assessments were conducted which have strengthened the annual monitoring of the reefs and collected baseline data for the socio-economic monitoring. In addition, a rapid assessment of the risk posed to island communities of ciguatera poisoning caused by potential increases in abundance of ciguatoxin producing dinoflagellates following bleaching was carried out. This study will eventually be expanded to encompass sites throughout the CORDIO region. Finally, as a record, a digital photographic database of the monitoring sites has been developed for the Island... |
| Tipo: Report |
Palavras-chave: Environmental assessment; Impact assessment; Socioeconomic development; Http://aims.fao.org/aos/agrovoc/c_37938; Http://aims.fao.org/aos/agrovoc/c_29966. |
| Ano: 2000 |
URL: http://hdl.handle.net/1834/475 |
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| DelSole, T.. |
| An optimal perturbation is an initial condition that optimizes amplitude growth over a prescribed time in a linear system. Previous studies have argued that optimal perturbations play an important role in turbulence. Two basic questions related to this theory are whether optimal perturbations necessarily grow in all turbulent background flows, and whether the turbulent flow necessarily excites optimal perturbations at the rate required to account for the observed eddy variance. This paper shows that both questions can be answered in the affirmative for statistically steady turbulence. The argument put forward here is independent of any closure theory of turbulence. In essence, the result follows from the fact that statistical equilibrium and conservation... |
| Tipo: Working Paper |
Palavras-chave: Perturbations. |
| Ano: 2003 |
URL: http://hdl.handle.net/1834/505 |
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| Aissaoui, A.; Turki, S.; Ben Hassine, O. K.. |
| Afin de fournir une meilleure idée sur la structure et la dynamique de la communauté des dinoflagellés et leurs relations avec les paramètres environnementaux dans les zones semi-fermées en communication avec le golfe de Tunis, une étude a été réalisée dans les ports puniques de Carthage afin d’estimer les densités et la dynamique des espèces de dinoflagellés ainsi que les variations des concentrations en nutriments, de janvier à juin 2006. Un nombre de 66 espèces de dinoflagellés ont été identifiés dont 14 espèces sont connues pour être nocives et responsables d’efflorescences nuisibles alors que 21 espèces sont connues pour être productrices de toxines. L'analyse statistique nous a permis de révéler des corrélations significatives entre les densités de... |
| Tipo: Journal Contribution |
Palavras-chave: Parameters; Nutrients (mineral); Coastal environment; Plankton; Nutrients; Plankton. |
| Ano: 2012 |
URL: http://hdl.handle.net/1834/5318 |
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| Kande, S.; Ministère de l'Enseignement Supérieur, des Universités et Centres Universitaires Régionaux et de la Recherche Scientifique, Dakar (Senegal); Université Cheikh Anta Diop, Faculté des Lettres et Sciences Humaines, Département de Sociologie, Dakar (Senegal). |
| Pour accomplir sa mission, le Ministère chargé de la pêche a mis en place une politique bâtie autour de la gestion durable et rationnelle des ressources halieutiques. Dans le cadre de cette politique, il a été mis en place des instruments sectoriel de gestion (permis de pêche, immatriculation des pirogues, etc.) et une réglementation à travers le cote de la pêche. Malgré la volonté affichée et les moyens déployés par l'administration des pêches, ces instruments de gestion sont difficiles à mettre en œuvre et la réglementation en vigueur est très souvent contournée par les pêcheurs artisanaux dont les aspirations et les logiques sont aux antipodes des préoccupations biologiques à long terme. Dans le cadre de ce travail, nous avons choisi d’étudier les... |
| Tipo: Theses and Dissertations |
Palavras-chave: Artisanal fishing; Fishing nets; Shrimp fisheries; Hydrology; Fishery management; Socioeconomic aspects; Fishing gear; Environmental legislation; Fishery management; Environmental legislation; Fishing nets; Hydrology; Fishing gear. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/5000 |
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| Delgadillo-Garzón, O.. |
| Fishes and macroinvertebrates associated to two types of artificial habitats deployed in Taganga Bay were assessed by stationary visual census to compare thes assemblages. Foty-one species of fishes and nine macroinvertebrates were observed in eleven visual censues. The distribution patterns depicted in abundance and richness between the two types of habitats used (concrete blocks vs. artificial shelters), were a possible response to dissimilarities in their location and number of visual census. A artificial structures in Colombia, probably owing to their proximity with heterogeneous natural habitats. The use of complex artificial habitats could have potential useful to conserve, restore and manage some marine resources supported in planned researchers in... |
| Tipo: Journal Contribution |
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| Ano: 2009 |
URL: http://hdl.handle.net/1834/3614 |
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| Registros recuperados: 5.192 | |
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