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Análise do custo e rentabilidade da produção de tilápia em tanques rede em represa rural com diferentes manejos alimentares. Repositório Alice
TURCO, P. H. N.; FRASCÁ-SCORVO, C. M. D.; DONADELLI, A.; SCORVO FILHO, J. D.; LOSEKANN, M. E..
Resumo: Esse estudo visa estimar o custo operacional de produção e a rentabilidade, da produção de tilápia em tanques rede em represa rural, submetida a diferentes manejos alimentares. O experimento foi constituído de 4 tratamentos e 4 repetições em um delineamento fatorial (2x2) avaliando-se dois tipos de ração (baseado no conceito de proteína ideal x ração comercial convencional) e dois manejos alimentares (alimentação em 7 dias por semana x 5 dias por semana). Assim, considerando os resultados obtidos em cada tratamento foi feita uma simulação onde foram calculados os custos e a rentabilidade para uma criação em cem tanques-rede de 4m³. Os resultados mostraram que a variação de ganho de peso foi significativo entre os tratamentos, onde o maior ganho de...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Custo operacional; Rentabilidade; Aquicultura; Tilapia; Produção; Tanque; Nutrição animal; Rentabilidade; Produtividade; Tilapia (common name); Fish production; Reservoirs; Animal nutrition.
Ano: 2013 URL: http://www.alice.cnptia.embrapa.br/handle/doc/967973
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Aquatic plant community in porto primavera reservoir Planta Daninha
Pitelli,R.L.C.M.; Pitelli,R.A.; Rodrigues,C.J.; Dias,J.H.P..
Aiming to identify the populations of aquatic plants present in the Porto Primavera reservoir and evaluate the behavior of Hydrilla verticillata colonization of this water body a survey was carried out in 2007. The data was based on presence or absence, only were assessed the presence or absence of the species and the data were subjected to cluster analysis to establish differences in distribution and occurrence of populations. The community of aquatic plants showed 24 species distributed in 16 botanical families. Cyperaceae and Pontederiaceae were the most representative in terms of species richness. The submerged macrophyte Hydrilla verticillata showed the highest frequency of occurrence in the water body, showing a different behavior from the other...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hydrilla verticillata; Reservoirs; Aquatic macrophytes exotic invasive aquatic weed.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000300001
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Arcobacter butzleri and A. cryaerophilus in human, animals and food sources, in southern Chile BJM
Fernandez,Heriberto; Villanueva,Maria Paz; Mansilla,Ingrid; Gonzalez,Mario; Latif,Fadua.
The isolation frequency of Arcobacter species in children with diarrhea, fowls, mammals and food of avian and marine origin was established. In all the samples it was possible to isolate Arcobacter species corresponding 201 (39.4%) to A. butzleri and 24 (4.7) to A. cryaerophilus. Both species were simultaneously isolated in 19 (3.7%) being A. butzleri the most frequently isolated species.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Arcobacter diarrhea; Reservoirs; Food.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000100145
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Balancing irrigation and hydropower: Case study from Southern Sri Lanka AgEcon
Molle, Francois; Jayakody, Priyantha; Ariyaratne, Badugodahewa Ranjith; Somatilake, H.S..
This report analyzes a case from southern Sri Lanka, where the Samanalawewa dam and the Kaltota Irrigation Scheme (KIS) compete for the water of the Walawe river. At the catchment level, it is shown that dam releases are well attuned to the needs of KIS and to the occurrences of natural runoff, and that little of the dam water is "lost" to the river.
Tipo: Report Palavras-chave: Reservoirs; Dams; Hydroelectric schemes; Economic analysis; Canals; Irrigation scheduling; Cropping systems; Case studies; Crop Production/Industries; Farm Management; Land Economics/Use.
Ano: 2005 URL: http://purl.umn.edu/44544
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Best management practices for tilapia cage culture in small rural reservoirs. Repositório Alice
QUEIROZ, J. F. de; FRASCÁ-SCORVO, C. M. D.; SCORVO FILHO, J. D.; LOSEKANN, M. E.; DONADELLI, A..
2011
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Tilapia cage culture; Small rural reservoirs; Tilapia; Reservoirs; Tilapia (common name).
Ano: 2011 URL: http://www.alice.cnptia.embrapa.br/handle/doc/919636
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Capacity building for participatory irrigation management in Sindh Province of Pakistan. AgEcon
Memon, Yameen; Talpur, Mustafa; Murray-Rust, Hammond.
Tipo: Working or Discussion Paper Palavras-chave: River basins; Institutions; Organizations; Private sector; Public sector; Local government; Mapping; Water resource management; Water policy; Legislation; Rural women; Constraints; Groundwater; Surface water; Water quality; Water use; Water users; Dams; Reservoirs; Large-scale systems; Irrigation management; Industrialization; Case studies; Operations; Maintenance; Canals; Conflict; Farmer-agency interactions; Policy; Water supply; Rural development; Community/Rural/Urban Development; Farm Management; Institutional and Behavioral Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2001 URL: http://purl.umn.edu/92769
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Conflicts Associated with Dam Removal in Sweden Ecology and Society
The increasing number of deteriorating old dams that need renovation or have lost their function make dam removal a viable management option. There are at least four major reasons for dam removal: safety, law and policy, economy, and ecology. Here we discuss 17 Swedish dams that were recently considered for removal. Because dam removal usually causes controversy, dam removal initiatives may succeed, fail, or result in a compromise such as a bypass channel for migrating fish. We identify and discuss three major obstructions to dam removal: funding, cultural-historical values, and threatened species. To facilitate dam removal, the reasons for, and the effects of, dam removal must be carefully explained, and the public and stakeholders must be kept...
Tipo: Peer-Reviewed Insight Palavras-chave: Controversies; Dam removal; Information; Obstructions; Reservoirs; Rivers; Stakeholder involvement; Sweden.
Ano: 2009
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Conocimiento local y crecimiento inicial del ojite (Brosimum alicastrum Swartz) bajo distintas condiciones de manejo en la zona de Lomeríos del municipío Paso de Ovejas, Veracruz, México. Colegio de Postgraduados
Domínguez Lagunes, Maira Antonia.
La investigación se realizó en dos etapas. El objetivo de la primera etapa fue documentar el conocimiento local sobre Brosimum alicastrum como árbol forrajero. Las entrevistas con los ganaderos mostraron que el 83% conocía aspectos ecológicos del árbol, el 9% la biología y un 77% aspectos sobre manejo del árbol; esta especie cayó en el desuso a partir del reparto agrario (1940) cuando la delimitación de las parcelas restringió el acceso a los árboles. Se concluyó que existe conocimiento sobre la utilización del árbol aunque limitado, y que el desarrollo tecnológico propició a que este recurso fuera cayendo en desuso; aunque aún existe interés en recuperarlo y utilizarlo. El objetivo de la segunda etapa considerando la primera, fue analizar el crecimiento...
Palavras-chave: Brosimum alicastrum; Vegetación nativa; Conocimiento local; Zonas rurales; Reservorios; Desuso; Hidrogel; Native vegetation; Local knowledge; Rural zones; Reservoirs; Disuse; Hydrogel; Agroecosistemas Tropicales; Maestría.
Ano: 2012 URL: http://hdl.handle.net/10521/1875
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Cyanobacterial occurrence and detection of microcystin by planar chromatography in surface water of Billings and Guarapiranga Reservoirs, SP, Brazil Rev. Bras. Bot.
Carvalho,Luciana R. de; Sant'Anna,Célia L.; Gemelgo,Marcina C.P.; Azevedo,Maria Teresa de P..
Billings and Guarapiranga Reservoirs were deeply affected by environmental disturbances, which more evident consequence are the cyanobacterial blooms. Microcystins are the most common cyanotoxin in freshwaters and more than 70 types are known. Different methods for microcystins analysis in water can be used, among which ELISA and HPLC are the most frequently employed. However, less sophisticated and more economic methods can also be used. This is the case of planar chromatography (thin-layer chromatography) method previously used in cyanotoxins purification but gradually replaced by others. Posterior optimization of the microcystin chromatography conditions and because of its simplicity, rapidity, efficiency and low cost, this method is again considered an...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cyanobacteria; Drinking water; Microcystins; Planar chromatography; Reservoirs.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042007000100014
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Dieta do tucunaré-amarelo Cichla monoculus (Bloch & Schneider) (Osteichthyes, Cichlidae), no Reservatório de Lajes, Rio de Janeiro, Brasil Zoologia
Santos,Luciano Neves dos; Gonzalez,Alejandra Filippo; Araújo,Francisco Gerson.
The diet of Cichla monoculus (Bloch & Schneider, 1801) in Lajes's Reservoir, a major impoundment in Rio de Janeiro State, Brazil, was assessed, from fishes collected in 1994,1996 and 1999/2000. Gut contents in individuals was analyzed by the index of relative importance (IRI) which deals with numerical, gravimetrical and frequency of occurrence. Cichla monoculus showed a strong piscivorous habits feeding on Cichlidae, Characidae and Pimelodidae, in decreasing order of importance, with a remarkable cannibalism on young-of-the-year. Others minor items in the diet were Macrobrachium sp. and Odonata. Changes in feeding composition varied with reservoir's zones and seasons, with higher diversity in Autumn and peaks of cannibalism in lower zone during...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cichla; Trofic ecology; Diet; Reservoirs; Freshwater fish; Condition factor; Feeding habits.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000500015
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Diversity of Odonata (Insecta) larvae in streams and farm ponds of a montane region in southern Brazil Biota Neotropica
Pires,Mateus Marques; Kotzian,Carla Bender; Spies,Marcia Regina; Neri,Damaris Battistel.
This study presents an inventory of the genera of Odonata found in streams and artificial farm ponds in a montane region, with temperate climate, in southern Brazil. Differences in richness of lotic and lentic environments were also investigated. The diversity of odonate families and genera in southernmost Brazil is lower than in warmer, either tropical or subtropical, regions of the country. Nine genera are new records for the region and six genera had their geographical ranges extended to regions with temperate climate of the Neotropics. The overall richness and especially the overall abundance recorded in the studied area are possibly determined by the occurrence of numerous farm ponds because natural standing waters are scarce in the region. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dragonfly; Inventory; Neotropical region; Reservoirs; Riverine fauna.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032013000300259
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Do distinct water chemistry, reservoir age and disturbance make any difference on phosphatase activity? IPB - Escola Superior Agrária
Geraldes, Ana Maria; Boavida, Maria José.
Alkaline phosphatase activity was assessed concomitantly with total phosphorus, orthophosphate and phosphomonoester concentrations in two meso-eutrophic reservoirs with distinct age and subjected to different kinds of environmental influence. Differences in conductivity, temperature and pH were found. However, during the study period alkaline phosphatase activity was similar in both reservoirs. Water colour was higher in S. Serrada Reservoir. This fact can be related to (1) reservoir age (2) high internal disturbance (3) large imputs of allochthonous detritus, resulting from the combined effect of grazing, fire and catchment slope. Despite the high water colour recorded in S. Serrada, alkaline phosphatase activity was apparently not inactivated by humic...
Tipo: Article Palavras-chave: Alkaline phosphatase; Orthophosphate regeneration; Phytoplankton; Zooplankton; Reservoirs.
Ano: 2003 URL: http://hdl.handle.net/10198/705
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Ecological assessment of a southeastern Brazil reservoir Biota Neotropica
Martins,Isabela; Sanches,Barbara; Kaufmann,Philip Robert; Hughes,Robert M.; Santos,Gilmar Bastos; Molozzi,Joseline; Callisto,Marcos.
Reservoirs are artificial ecosystems with multiple functions having direct and indirect benefits to humans; however, they also cause ecological changes and influence the composition and structure of aquatic biota. Our objectives were to: (1) assess the environmental condition of Nova Ponte Reservoir, Minas Gerais state, southeastern Brazil; and (2) determine how the aquatic biota respond to disturbances. A total of 40 sites in the littoral zone of the reservoir were sampled to characterize physical and chemical habitat, land use, and benthic macroinvertebrate and fish assemblages. The predominant type of land cover near the reservoir was natural vegetation. A total of 29 fish species and 39 macroinvertebrate taxa were collected, including eight alien...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Reservoirs; Water quality; Bioindicators; Physical habitat; Environmental quality.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032015000100103
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Economics and politics of water resources development: Uda Walawe Irrigation Project, Sri Lanka AgEcon
Molle, Francois; Renwick, Mary E..
The Uda Walawe Irrigation and Resettlement Project (UWIRP) located in the Southern dry zone of Sri Lanka was initiated in the early 1950s. The original plan for the UWIRP was a highly ambitious social, economic and physical engineering project aimed at creating a modern, profitable agriculture sector. This report examines the history of water resources development and investment decisions for the UWIRP over a period of 50 years and uncovers underlying processes that shaped the evolution of the project and highlights the limitation of viewing development as a mere set of technical and social engineering endeavors.
Tipo: Report Palavras-chave: Water resources development; Irrigation programs; History; River basins; Rehabilitation; Costs; Crop production; Domestic water; Water use; Reservoirs; Fisheries; Decision making; Cost benefit analysis; Cost recovery; Water requirements; Water demand; Demand and Price Analysis; Environmental Economics and Policy; Farm Management.
Ano: 2005 URL: http://purl.umn.edu/44525
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Efeitos da ocupação do solo, do uso da água e da idade das albufeiras nos parâmetros ambientais e na estrutura das comunidades zooplanctónicas IPB - Escola Superior Agrária
Geraldes, Ana Maria.
O presente trabalho decorreu em três albufeiras de idades distintas e sujeitas a diferentes tipos de perturbações de origem antropogénica. Estes sistemas aquáticos localizam-se na parte portuguesa da Bacia Hidrográfica do Rio Douro, na região de Trás-os-Montes. A albufeira da Serra Serrada foi criada em 1995 com o objectivo de abastecer de água a cidade de Bragança, actualmente com 34.750 habitantes. Como consequência do intenso consumo de água ocorrem flutuações de grande amplitude no seu nível. Por outro lado, na bacia de drenagem desta albufeira a pastorícia é particularmente intensa durante o Verão. Devido a esta actividade ocorrem nesta área, fogos frequentes que são induzidos pelos pastores com o objectivo de obterem melhores pastagens. A albufeira...
Tipo: Book Palavras-chave: Albufeiras; Estado trófico; Uso do solo; Idade das albufeiras; Qualidade da água; Flutuações no nível da água; Variáveis ambientais; Comunidades fito e zooplactónicas; Precipitação; Macrófitos; Actividade da fosfatase alcalina; Regeneração do ortofosfato; Nutrientes; Reservoirs; Trophic state; Nutrients; Land use; Reservoir age; Water quality; Water level fluctuation; Environmental variables; Phytoplankton and zooplankton assemblages; Precipitation; Macrophytes; Kaline phosphatase activity; Orthophosphate regeneration.
Ano: 2004 URL: http://hdl.handle.net/10198/770
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Estimación de aportaciones deducidas a presas mediante análisis de series de tiempo estacionales. Colegio de Postgraduados
Ariza Hernández, Isaías.
Para el estudio de las aportaciones deducidas, que se pueden esperar en presas, se analizan con modelos matemáticos basados en la estadística, con los que se trata de inferir el comportamiento de las variables hidrológicas, que en este caso, son las aportaciones deducidas. Dichos modelos pueden ser modelos de series de tiempo. El objetivo fundamental de este trabajo es presentar una metodología de análisis de series de tiempo estacionales cuyo dominio es el tiempo propuesto por Box y Jenkins (1970). La importancia del estudio de las aportaciones radica principalmente en la estimación del volumen de agua que se espera escurra en una corriente con fines de planeación de los sistemas de irrigación. La metodología fue aplicada al registro histórico de...
Palavras-chave: Aportaciones deducidas; Series de tiempo estacionales; Modelos Box-Jenkins; Surface inflows; Reservoirs; SARIMA; Time-Series; Irrigation districts; Maestría; Hidrociencias.
Ano: 2012 URL: http://hdl.handle.net/10521/725
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Estimating cyclopoid copepod species richness and geographical distribution (Crustacea) across a large hydrographical basin: comparing between samples from water column (plankton) and macrophyte stands Rev. Bras. Zool.
Perbiche-Neves,Gilmar; Rocha,Carlos E.F. da; Nogueira,Marcos G..
Species richness and geographical distribution of Cyclopoida freshwater copepods were analyzed along the "La Plata" River basin. Ninety-six samples were taken from 24 sampling sites, twelve sites for zooplankton in open waters and twelve sites for zooplankton within macrophyte stands, including reservoirs and lotic stretches. There were, on average, three species per sample in the plankton compared to five per sample in macrophytes. Six species were exclusive to the plankton, 10 to macrophyte stands, and 17 were common to both. Only one species was found in similar proportions in plankton and macrophytes, while five species were widely found in plankton, and thirteen in macrophytes. The distinction between species from open water zooplankton and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: La Plata River basin; Reservoirs; Rivers; Zooplankton.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702014000300005
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Farmer response to rationed and uncertain irrigation supplies AgEcon
Perry, Christopher J.; Narayanamurthy, S.G..
Explores the theoretical and actual responses of farmers faced with irrigation supplies that are limited in relation to available land and labor resources, and where the actual schedule and available volume for delivery are uncertain.
Tipo: Report Palavras-chave: Water resource management; Water use efficiency; Evapotranspiration; Agricultural production; Irrigated farming; Irrigation scheduling; Water allocation; Water supply; Water scarcity; Water delivery; Reservoirs; Uncertainty; Yield; Crop Production/Industries; Labor and Human Capital; Land Economics/Use.
Ano: 1998 URL: http://purl.umn.edu/44582
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Fish assemblage in a dammed tropical river: an analysis along the longitudinal and temporal gradients from river to reservoir Neotropical Ichthyology
Terra,Bianca de Freitas; Santos,Alex Braz Iacone dos; Araújo,Francisco Gerson.
We analysed changes in the fish assemblage structure along a longitudinal gradient of the Paraíba do Sul River and Funil Reservoir. We tested the hypothesis that shifts from lotic to lentic environment affect the richness and structure of the assemblage which are modulated by seasonal rainfall changes. Standardised monthly samplings were carried out from October 2006 to September 2007 in four zones: 1) river upstream from the reservoir; 2) upper part of the reservoir; 3) lower part of the reservoir, and 4) river downstream from the reservoir. Fishes were caught using gillnets deployed for 15 hours. We collected a total of 4550 specimens, representing 35 species and 5 orders. The highest richness and diversity were recorded in zone 2, the transitional zone...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Spatial patterns; Physico-chemical variables; Reservoirs.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000300004
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Health impacts of small reservoirs in Burkina Faso. AgEcon
Boelee, Eline; Cecchi, Philippe; Kone, Andre.
In Burkina Faso, at least 1,700 small reservoirs have been constructed, most of them during the last 30 years. Numerous and scattered, these beneficial multipurpose systems combine productive with domestic water uses. However, their environmental and health impacts remain insufficiently documented. This report combines data from different sources into syntheses and national maps, with a focus on water-related diseases. The mitigation of negative impacts requires an integrated approach to specifically identify the enhancing and limiting factors that influence environmental impacts and the transmission of diseases around reservoirs. Public awareness campaigns need to accompany the promotion of preventive and curative measures and the development of...
Tipo: Working or Discussion Paper Palavras-chave: Reservoirs; Health hazards; River basins; Water resources development; Environmental effects; Waterborne diseases; Malaria; Schistosomiasis; Control methods; Water policy; Environmental Economics and Policy; Health Economics and Policy; Land Economics/Use; Resource /Energy Economics and Policy.
Ano: 2009 URL: http://purl.umn.edu/91869
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