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| Registros recuperados: 5.192 | |
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| Enríquez, D.; González, M. del C.; Delgado, Y.. |
| Actualmente existen escasos trabajos sobre la influencia de las lluvias en la distribución de los hongos presentes en los ecosistemas marinos. Este estudio tiene como objetivo conocer la distribución de los hongos marinos en los meses de junio (lluvioso) y marzo (seco) del año 2000, en dos playas ubicadas al norte de Ciudad de la Habana. Se empleó la metodología de incubación de sustratos vegetales en cámara húmeda y los hongos aislados se clasificaron hasta nivel de especie. Se obtuvieron un total de 82 aislamientos, de los cuales el 87.6 % corresponden a hongos ascomicetos y el 13.4% a hongos mitospóricos. Corollospora marítima y Lindra marinera fueron las especies más frecuentes, con 26.8% y 17%, respectivamente. En junio el número de aislamientos de... |
| Tipo: Journal Contribution |
Palavras-chave: Fungi; Seasonal distribution; Fungi; Http://aims.fao.org/aos/agrovoc/c_3145. |
| Ano: 2008 |
URL: http://hdl.handle.net/1834/3397 |
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| Zhang, Yuexia; MIao, Zhenqing; Yan, Shiqiang. |
| The research on water masses is always one important facet of Oceanography. I adopt the method of Fuzzy Density Clustering to analyse water masses. Meanwhile, I use Visual Basic 6.0 as developing platform and utilize the MapX components to develop the platform of GIS. By integrating the Water Masses Model compiled by FORTRAN language, and GIS using Tight Coupling, I develop an Integrated System. That makes all phases are finished in one condition, including the gain of computing grid, the pick-up and analysis of data, the choice of parameters and resetting, the computing of model, and the result’s visualization. It improves the efficiency of the data analysis and decision-making. Finally, this system is applied in the Zhoushan fishing ground and adjacent... |
| Tipo: Journal Contribution |
Palavras-chave: Water masses; GIS; Models. |
| Ano: 2008 |
URL: http://hdl.handle.net/1834/5877 |
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| 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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| El-Sayed, H.Kh.A.. |
| Growth and population dynamics parameters of Alepes djedaba as an exotic carangid fish species from Red Sea into the Levant Basin of the Mediterranean Sea, were investigated. Fish samples were obtained from purse-seiners operating during the day time from Jan. to Dec. 2003 in Abu Qir Bay, Eastern Alexandria. The results obtained show that back-calculated lengths (based upon otolith readings) for the first; second and third age groups were 10.38; 15.4 and 19.32 cm TL respectively, the estimated Bertalanffy growth parameters were L∞=33.29 cm, K=0.2473 and t0= -0.51. The Length-weight relationship was represented by the formula: Log W=-1.9245+2.9762 Log L. Total mortality (Z), natural mortality (M) and fishing mortality (F) were 1.85; 0.62 and 1.23... |
| Tipo: Journal Contribution |
Palavras-chave: Mortality; Yield/recruit; Growth; Carangidae. |
| Ano: 2005 |
URL: http://hdl.handle.net/1834/4995 |
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| Osorno Arango, A.; Díaz Merlano, J.M.. |
| Exploitation, uses and current status of the West Indian topshell Cittarium pica (Mollusca: Gastropoda, Trochidae) along the Colombian Caribbean coast. The West Indian topshell, Cittarium pica is a common and conspicuous gastropod that thrives in Caribbean intertidal rocky shores and has been used for food by men since pre-Columbian times. Although, the exploitation of this resource is practiced only by artisanal fishermen and mainly for self-consumption, its abundance has noticeably reduced in the last ten years, so the species has been included in the endangered animal lists of several Caribbean countries, including Colombia. The present study was carried out to assess the current status of the population of C. pica along the Colombian Caribbean mainland... |
| Tipo: Journal Contribution |
Palavras-chave: Marine molluscs; Resource conservation; Resource conservation; Http://aims.fao.org/aos/agrovoc/c_6523. |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/1974 |
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| Garcés, Y.; Betanzos, A.. |
| Muestreos realizados en meses lluviosos de los años 2008 y 2009 manifiestan influencia de aguas dulces en la salinidad del Golfo de Guacanayabo, registrándose valores promedios de 34,9 y 33,6 ‰, respectivamente. Elementos no conservativos como el SiO3, el P-PO4- y el N-NH4+ manifiestan una tendencia al incremento a medida que disminuye la salinidad presentándose correlaciones negativas significativas (α<0,05), corroborando la importancia de los escurrimientos fluviales en el aporte de nutrientes. Los bajos coeficientes de correlación denotan otras fuentes de aporte. En comparación con registros anteriores se observan disminuciones en los SiO3, incrementos del P-PO4- y una variabilidad con tendencia ascendente-descendente en los compuestos nitrogenados. |
| Tipo: Preprint |
Palavras-chave: Salinity; Nutrients (mineral); Salinity; Http://aims.fao.org/aos/agrovoc/c_6751. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/3628 |
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| Capape, Ch.; Bradai, M. N.; Seck, A. A.; Diata, Y.; Tomasini, J. A.; Quignard, J. P.. |
| Des aspects de la biologie de la reproduction du sagre noir, Etmopterus spinax, sont présentés dans cette note. Les spécimens observés sont récoltés au large des côtes tunisiennes et de la côte du Languedoc (France méridionale), sur des fonds sableux et/ou sablo-vaseux allant de 100 à 400 m de profondeur. Les mâles sont adultes au-delà de 380 mm de longueur totale (LT). La phase de maturation des femelles entrent dans une phase de maturation. La plus petite femelle avec des oocytes majeurs prêts à être pondus mesurait 380 mm LT le la plus petite femelle gravide, 400 mm LT. Toutes les femelles adultes ont plus de 400 mm LT. La taille maximale est de 400 mm LT pour chaque sexe. La gestation pourrait durer une année au minimum, mais il serait hypothétique... |
| Tipo: Journal Contribution |
Palavras-chave: Elasmobranchii; Squalidae Reproduction Reproductive cycle Sexual maturity Shark fisheries Reproduction Sexual maturity http://aims.fao.org/aos/agrovoc/c_6507 http://aims.fao.org/aos/agrovoc/c_7016. |
| Ano: 2001 |
URL: http://hdl.handle.net/1834/4084 |
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| Payet, R.J.. |
| Net fishing is an important component of the artisanal fishery of the Seychelles. It is composed of beach seine, encircling and set gillnets. This report reviews net fishery and its impact on the environment and fish stocks and provides a framework for its management. There are no current management measures for the traditional net fisheries except that all nets above 50 metres requires a license with a lead seal bearing the licence number. Certain irresponsible uses of these nets have ben acknowledged, principally the 'Met outaz' fishing strategy, incidental catch of marine mammals and the presence of commercially important juvenile fish in the beach seine fishery. SFA has addresses these issues rationally and management options are explored followed by... |
| Tipo: Report |
Palavras-chave: Net fishing; Fishery management; Seychelles; Fishery regulation; Artisanal fishing; Net fishing; Beach seines. |
| Ano: 1997 |
URL: http://hdl.handle.net/1834/771 |
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| De la Garza González, J.L.; Ravalli, C.; López Greco, L.. |
| The objective of this work is to increase knowledge on the distribution and punctual density of both morphotypes of Munida gregaria in the San Jorge Gulf, Argentina. The data derived from the research cruise carried out on board of the FV Álvarez Entrena I in February 2011. Specimens of gregaria and subrugosa were caught in 37 and 73 of the 91 trawls performed, respectively. Out of the total of positive trawls, 17 were performed at depths lower than 55 m and the remaining 60 at deeper waters. The relative average abundance of both morphotypes increased significantly with regard to the two previous years (2009, 2010). M. gregaria subrugosa represented 66.4% and gregaria the remaining percentage. In the south sector of the gulf, where the highest punctual... |
| Tipo: Journal Contribution |
Palavras-chave: Biogeography; Abundance; Size distribution; Fishery surveys. |
| Ano: 2013 |
URL: http://hdl.handle.net/1834/5487 |
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| 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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| Ksouri, J.; Elferjani, H.; Mensi, F.. |
| L’identification d’un principe actif servant en thérapie osseuse a propulsé l’algue brune Padina pavonica au rang des algues à intérêt économique très prisées à l’échelle mondiale et en Tunisie. L’évaluation des potentialités de cette espèce au niveau d’un site atelier, Cap Zebib (Nord-Est de la Tunisie), a été initiée pour éclairer les décideurs sur l’état du stock, afin que l’autorisation pour la collecte d’un certain tonnage de cette algue soit accordée en connaissance de cause. A Cap Zebib, l’espèce en question étant localisée dans la zone comprise entre 0 et 10 m, la biomasse naturelle disponible est évaluée à 112,5 tonnes de matière fraîche, soit 25 tonnes de matière sèche (22,2%). Le rendement global est de 0,850 t/ha. Mais, comme la majeure partie... |
| Tipo: Journal Contribution |
Palavras-chave: Biomass; Commercial species; Seaweed products; Seaweeds; Stock assessment. |
| Ano: 2008 |
URL: http://hdl.handle.net/1834/4251 |
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| Franklin, H.; Muhando, C. A.. |
| Anthropogenic pressures on the coral reefs of Tanzania are high. Over-exploitation, destructive fishing practices, unplanned tourism and high sedimentation load are amongst the most evident contributing factors whilst the poor economy and increased human population density along the coast is an underlying problem. There is a clear need for alternative sources of livelihood and effective ways to manage coral reef resources sustainably. Mariculture is becoming a common component in coastal zone management in Tanzania. |
| Tipo: Report |
Palavras-chave: Coral reefs. |
| Ano: 1996 |
URL: http://hdl.handle.net/1834/992 |
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| Adekanbi, E.O.; Okoye, B.C.O.; Ajao, E.A.. |
| The state of pollution in the Lagos lagoon was examined by a field survey of twenty-six sites (stations) in the dry and wet season in 1985. Some selected sites were further re-examined in the same period in 1986. The sediment trace metals and total hydrocarbons were analysed. The relationship between non residual and residual trace elements was examined. For both years of study, total trace metal levels (mg/kg) fell in the ranges: Cu,1.9 – 132.4, Cr, 2.9 – 167; 7.8 – 830. 6; Ph, 1.6 – 483.1 and Cd, 0.04 – 15.5. Total hydrocarbon concentrations in 1985 ranged from 0.25 to 2766.27 mg/g with high concentrations in muddy and sandy sediments. The results show marked variations and non – uniform distribution from one season to another. With few exceptions,... |
| Tipo: Working Paper |
Palavras-chave: Environmental pollution; Coastal waters. |
| Ano: 1991 |
URL: http://hdl.handle.net/1834/269 |
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| McCallum, J.N.; Paterson, L.; Greenwood, M.F.D.. |
| Tree and pneumatophore height and density of Avicennia marina were measured along a point -intersection/band transect at Nabq, Red Sea, to establish possible zonation patterns amongst these mangrove characteristics. There was a significant increase in pneumatophore height and density landwards to seawards. Tree density decreased significantly down the transect. Graphical analysis showed an increase in tree height followed by a decrease at the seaward edge. Investigation of a theoretical increase in productivity (biomass) down the shore by leaf index calculation (leaf index = average leaf area x number of leaves per station) was inconclusive from data obtained. |
| Tipo: Working Paper |
Palavras-chave: Mangroves. |
| Ano: 2004 |
URL: http://hdl.handle.net/1834/382 |
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| Registros recuperados: 5.192 | |
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