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| Registros recuperados: 343 | |
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| Raini, Jackson A.. |
| Routine in situ and laboratory measurements of pH, Conductivity, DO, temperature, alkalinity, salinity, TSS, TDS, Secchi depth and nutrient levels have been carried out at 13 sampling sites in Lake Nakuru (Kenya), influent streams and urban effluent since 1993. Mean values for 8 lake sampling sites are: pH (10.14), Temperature (27.3°C), Conductivity (38.8mS/Cm), DO (9.21mg/l, 83% saturation), Secchi depth (10.3Cm). Mid-lake sampling at 19 sites showed the presence of a thermocline of upto 4 °C gradient (surface to bottom). DO levels (>2m/l) remained within the tolerance thresholds for A. fusiformis and the fish (S. grahami). Trace metal concentrations in Lake Nakuru water and sediment as determined by X-ray fluorescence spectroscopy, varied over an... |
| Tipo: Proceedings Paper |
Palavras-chave: Water quality; Biodiversity; Water levels (lakes). |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/2071 |
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| Palacios, C.; Burgos, L.. |
| Se analiza los datos tomados en el área marino costera de tres importantes islas de Galápagos como son: Bahía Academia-Santa Cruz, Caleta Aeolian-Baltra y Puerto Villamil-Isabela, durante los meses de junio y julio del 2007, considerando la distribución superficial de los parámetros físicos, químicos en cada una de las áreas. Se efectúa el análisis comparativo de las concentraciones promedios y la calidad microbiológica con los límites permisibles establecidos en la Legislación Secundaria Ambiental, concluyendo en general, que la calidad del agua está acorde con la vida marina, pero que a pesar de no presentar mayores problemas de contaminación, existen área muy puntuales que ameritan mayor cuidado y seguimiento para preservar y conservar estas islas que... |
| Tipo: Journal Contribution |
Palavras-chave: Water quality; Microbiological analysis; Physical properties; Data processing; Water quality; Microbiological analysis; Physical properties; Data processing; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_25302; Http://aims.fao.org/aos/agrovoc/c_13328; Http://aims.fao.org/aos/agrovoc/c_10289. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/3369 |
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| Mohammed, S.M.. |
| The coastal area of Tanzania (Fig. 1) encompasses a number of habitats that include coral reefs, mangroves, seagrass beds, sand banks, wetlands and beaches, among others. In addition to being essential linkages in the overall functioning of the coastal area, these coastal habitats support various resources both living and non-living. In addition, for generations the coastal area has provided life support to coastal communities where such activities as fisheries and related activities have played an important role in the social and economic development of local communities. In recent years, coastal tourism and mariculture have immerged as being potentially among most important economic activities nationally. The well being of these habitats and resources... |
| Tipo: Preprint |
Palavras-chave: Coral reefs; Mangroves; Seagrass; Wetlands; Beaches; Water quality; Pollution. |
| Ano: 2000 |
URL: http://hdl.handle.net/1834/183 |
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| Martínez Canals, M.; Montalvo, J.F.; Miravet, M.E.; Lugioyo, M.; Loza, S.; Pérez, R.. |
| The evaluation of the possible environmental changes due to the anthropic impacts that have happened in the last years in this scenario and the redefinition of areas that suffer affectations were carried up. Any environmental alteration of this ecosystem, either of natural or human origin, can have an important economic and social repercussion. According to the proposed chemical and biological indexes, the waters of the Gulf of Batabanó presented mesotrophic conditions with tendency to the eutrofization in four fundamental areas. In the silts of the Gulf the values of organic carbon and sulphidric acid were characteristic of sediments with high concentrations of organic matter. In the coastal sector N, was determinate high concentrations of sulphidric acid... |
| Tipo: Conference Material |
Palavras-chave: Heavy metals; Environmental impact; Coastal waters; Water quality; Man-induced effects; Marine pollution; Heavy metals; Environmental impact; Water quality; Coastal waters; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_24420; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_25205. |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/2254 |
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| Martinez Canals, M.; Lugioyo Gallardo, G.M.; Loza Alvarez, S.; Garcia, I.; Cesar, M.E.; Chang, E.; Esponda, S.; Sanchez, M.; Nuñez, R.. |
| Una de las causas que puede haber incidido de forma negativa en las poblaciones de langosta en el Golfo de Batabanó, son los cambios en la calidad ambiental del medio. Por tal motivo, se estudia el comportamiento de un conjunto de variables abióticas y bióticas y se compara con la información histórica existente que se remonta a la década de los años ’60. El estudio abarca dos matrices, aguas y sedimentos de fondo, en las especialidades de química, microbiología y fitoplancton. La salinidad mostró una baja variabilidad y valores elevados con una media de 38.64 ups, lo cual es de esperar teniendo en cuenta la gran sequía que sufrió el País durante muchos meses. El oxígeno disuelto mostró concentraciones normales para este tipo de ecosistema y valores por... |
| Tipo: Journal Contribution |
Palavras-chave: Water quality; Water quality; Http://aims.fao.org/aos/agrovoc/c_16061. |
| Ano: 2008 |
URL: http://hdl.handle.net/1834/3401 |
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| Mensi, F.; Ksouri, J.; Hammami, W.; Romdhane, M.S.. |
| La caractérisation environnementale de trois zones de la lagune de Bizerte a été faite dans le but d’identifier le meilleur emplacement pour la culture de l’algue rouge Gracilaria verrucosa. La concentration et la distribution des nutriments (ammonium, phosphate) dans l'eau ainsi que la salinité, la température et l’oxygène dissous ont été étudiées dans trois stations d’échantillonnage à différentes profondeurs (1, 2, 3 et 4 m) durant le printemps 2009 afin de suivre leurs variations. Les méthodes analytiques internationales standardisées ont été appliquées. La lagune est influencée par les apports de son bassin versant et est caractérisée par l’absence de toute stratification horizontale et verticale concernant les différents paramètres étudiés. Cette... |
| Tipo: Journal Contribution |
Palavras-chave: Site selection; Water quality; Gracilaria verrucosa. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/4991 |
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| Isla Molleda, M.. |
| Recirculating aquaculture systems (RAS) for fish culture have been used for more than three decades. The interest in RAS is due to their have advantages such as greatly reduced land and water requirements in places where the water resources are limited; but the RAS have also disadvantages like the deterioration of the water quality if the water treatment processes within the system are not controlled properly. The water quality problems in RAS were associated with low DO and high fish waste metabolite levels in the culture water. The objective of this study was to compare water quality in a RAS with water quality in a Limited Reuse System (LRS) for Arctic charr culture taking into account the oxygen demands of the fish; the metabolites production by the... |
| Tipo: Preprint |
Palavras-chave: Water quality; Fish culture; Water quality; Fish culture; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_2918. |
| Ano: 2008 |
URL: http://hdl.handle.net/1834/3102 |
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| El-Shenawy, M.; Farag, A.. |
| Spatial and temporal variability in the saprophytic (SB) and salt tolerant saprophytic (STSB) bacterial counts as well as total coliforms (TC), E. coli (EC) and fecal streptococci (FS) were investigated in the Egyptian surface coastal waters of Aqaba and Suez Gulfs as well as Red Sea. A total of 200 samples collected from 40 sites during January, March, May, July and September 2002 were investigated. Hydrographical parameters including water temperature (oC), salinity (S%o), dissolved oxygen (DO) and pH were also measured. According to the European and Egyptian current standards, out of 200 samples analyzed during 2002, 183 samples (91.5%) were accepted for marine recreational purposes. The obtained results indicated that water quality of the investigated... |
| Tipo: Journal Contribution |
Palavras-chave: Recreational waters; Water quality; Bacterial; Indicators; Saprophytic bacteria Bacteria Coastal waters Bacteria http://aims.fao.org/aos/agrovoc/c_765. |
| Ano: 2005 |
URL: http://hdl.handle.net/1834/1255 |
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| Mmochi, A.J.; Mwandya, A.W.. |
| The Makoba integrated mariculture pond system project (IMPS) has been on-going since 1998. Except for a period from mid 1999 to 2001, various water quality parameters, namely temperature, salinity, pH, dissolved inorganic nutrients and dissolved oxygen concentration and saturation, have been monitored continuously. In 2002, measurement of sediment oxygen demand (SOD) and consumption of oxygen by sediments was initiated. Dissolved oxygen concentration varied from the highest monthly average of 7.16 mg/l in October 1998, to 2.2 mg/l in March 2000 (r = –0.69). Nutrient concentrations remained moreor- less constant, except in the finfish ponds, where slight variations were recorded. The lowest concentration of ammonium-nitrogen (3.02 mg-at N/l) was recorded in... |
| Tipo: Journal Contribution |
Palavras-chave: Mariculture; Water quality. |
| Ano: 2003 |
URL: http://hdl.handle.net/1834/966 |
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| Bejaoui, B.; Elbour, M.; Belhassen, M.; Mrouna, R.; Boukef, I.; Mejri, S.; Harzallah, A.; Boudabous, A.. |
| La présente étude est effectuée dans le but d’évaluer l’effet des facteurs du milieu sur la distribution des populations bactériennes entériques dans un milieu lagunaire : la lagune de Bizerte. Un échantillonnage saisonnier, (novembre 2004, février 2005, mai 2005 et août 2005), portant sur 41 stations couvrant toute la lagune ont été réalisés. Les analyses bactériologiques effectuées ont concerné l’eau et le sédiment. Les paramètres physico-chimiques de l’eau ont été mesurés in-situ simultanément aux différents échantillonnages. Aussi, les paramètres climatiques ont été fournis par une station météorologique située à proximité de la lagune. Les résultats obtenus ont révélé que les charges en bactéries sont plus importantes dans les sédiments que dans... |
| Tipo: Journal Contribution |
Palavras-chave: Abiotic factors; Ecosystems; Geographical distribution; Pollution monitoring; Public health; Water quality. |
| Ano: 2008 |
URL: http://hdl.handle.net/1834/4262 |
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| Maridueña, Ana; Chalén, Norma; Coello, Dialhy; Cajas, Jacqueline; Elías, Esteban; Solís, Pilar; Aguilar, Fernando. |
| En febrero de 2003 en la Laguna de Yahuarcocha, se registró la muerte masiva de peces, estimándose que morían aproximadamente 500 peces/m2 por causas no conocidas. Fenómeno que se mantuvo durante algunas semanas disminuyendo paulatinamente el número de muertes. El Instituto Nacional de Pesca realizó un monitoreo durante los días 19 y 20 de marzo, con la finalidad de determinar las posibles causas, para lo cual se analizaron los parámetros ambientales, biológicos, identificación de las especies presentes en la laguna y la histopatología de los órganos y tejidos de los peces afectados. Los parámetros físico-químicos en la columna de agua y sedimentos registrados se encontraron dentro de los rangos normales para cuerpos lóticos. Desde el punto de vista... |
| Tipo: Journal Contribution |
Palavras-chave: Mortality causes; Pathology; Water quality; Fresh water; Fish diseases; Fish mortality. |
| Ano: 2011 |
URL: http://hdl.handle.net/1834/4501 |
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| Registros recuperados: 343 | |
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