Consulta: subjectFacets:"Recirculation"
Registros recuperados: 6
Data/hora: 06/06/2024 11:00:22

Water and fertilizers use efficiency in two hydroponic systems for tomato production
Provedor de dados: 75
Autores: Rosa-Rodríguez,Rodolfo De la; Lara-Herrera,Alfredo; Trejo-Téllez,Libia Iris; Padilla-Bernal,Luz Evelia; Solis-Sánchez,Luis Octavio; Ortiz-Rodríguez,José Manuel.
ABSTRACT The amount of water and fertilizers used in the production of vegetables, specifically tomatoes, is high. This study was carried out to determine water and fertilizers use efficiency in closed and open hydroponic systems for tomato production under greenhouse conditions. Two treatments with eight replications were assessed; each replication consisted of 67 pots with two plants each. One treatment was a closed hydroponic system (with nutrient solution recirculation), and the other was an open hydroponic system (with non-recirculating nutrient solution). We quantified the amounts of water and fertilizers applied, as well as the losses (drained nutrient solution), in the two treatments during the entire cycle of tomato. In the nutrient solution (NS)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum lycopersicum; Efficient water and fertilizers use; Open and closed hydroponics systems; Recirculation.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362020000100047

High-rate algal pond treatment for water reuse in an integrated marine fish recirculating system: effect on water quality and sea bass growth
Provedor de dados: 5
Autores: Deviller, Genevieve; Aliaume, Catherine; Franco, Miguel; Casellas, Claude; Blancheton, Jean-paul.
A high-rate algae pond (HRAP) was tested as a second loop of water treatment in a recirculating fish rearing system to reduce water requirements and nutrient discharge levels. Three duplicated groups of sea bass (mean initial body weight 3 5 I I g) were reared under different system conditions (flow-through system, recirculating system and recirculating system with HRAP) for I year. Fish survival rate was higher in the system with HRAP, and their mean body weight was statistically higher (p&lt;0.05) during the month of maximal climatic conditions for algae photosynthesis. After 266 days of experiment, mean fish weight was significantly higher (p&lt;0.05) in the flow-through system than in the recirculating systems. Final fish weight was 15% higher in the...
Tipo: Text
Palavras-chave: Sustainability; Phosphorus; Nitrogen; Fish growth; Recirculation; High rate algae pond.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/publication-620.pdf

Aquaculture en système clos : estimation des coûts de production pour l'élevage du bar et du turbot
Provedor de dados: 5
Autores: Lavenant, M; Paquotte, Philippe.
Two major constraints to aquaculture have raised in most countries : the little availability of convenient sites because of the competition for the use of the coastline and the progressive implementation of regulations to reduce the impact of the farms on the environment. The technique of recirculation, widely used for hatcheries, has been developed to answer these constraints and to get free of the natural variations in order to regulate the résults. The ongrowing experimental facilities have proved good enough results to make it possible to conceive industrial projects for sea-bass and turbot. In first approach, the production costs of these systems are similar to traditional techniques but expected productivity gains due to an increase of zootechnical...
Tipo: Text
Palavras-chave: Economical aspects; Production costs; Sea bass; Turbot; Marine aquaculture; Recirculation; Closed system; SEM; Aspects économiques; Coût de production; Bar; Turbot; Aquaculture marine; Système clos; Circuit fermé.
Ano: 1995
URL: http://archimer.ifremer.fr/doc/1995/acte-4032.pdf

Optimisation de deux systèmes de production piscicole : biotransformation des nutriments et gestion des rejets
Provedor de dados: 5
Autores: Roque D'Orbcastel, Emmanuelle.
Sustainability of fish aquaculture is currently subjected to environmental protection enhancement and to increasing restrictions of water and energy availability. The aim of this work was to study the biotransformations and waste management in a salmonid french farm (Charles Murgat S.A.S, Isère). Quantification of the wastes is necessary for the farmers and administrations to define control tools and treatment systems in view of water legislation respect (French water low, EC Water Framework Directive). The nutritional method gives a direct relation between feed and effluent fluxes. This method is easier to use than the hydrobiological method, which requires precise flow rate and concentration measurements (difficult and expensive). Solid waste treatment...
Tipo: Text
Palavras-chave: Traitement de l'eau; Rejets; Analyse du cycle de vie; Bien être; Recirculation; Biotransformations; Salmonidés; Pisciculture.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/these-3893.pdf

Fish growth and health aspects of sea bass (Dicentrarchus labrax) reared in standard vs. high rate algal pond recirculation systems
Provedor de dados: 5
Autores: Mladineo, Ivona; Bocina, Ivana; Przybyla, Cyrille; Fievet, Julie; Blancheton, Jean-paul.
Recirculation aquaculture system (RAS) is the type of land-based aquaculture production that interferes the least with the environment, particularly due to low effluent volume and overall water requirement. Water reuse, sometimes limited by the accumulation of waste products excreted by fish, can be improved by incorporating another biotechnical component in the form of high rate algal pond (RAS+HRAP), thus adding to the economy and self sustainability of the system. Our goal was to evaluate whether rearing fish for 1 year in a RAS or RAS+HRAP led to differences in fish production and health, by assessing: (1) fish growth; (2) impact on the morphological structure of sea bass target tissues (liver, kidney, and spleen); (3) susceptibility to monogenean...
Tipo: Text
Palavras-chave: Health; High rate algal pond; Recirculation; Sea bass.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00011/12228/9010.pdf

The use of Arthrospira platensis in rearing Nile tilapia (Oreochromis niloticus) in salt water
Provedor de dados: 124
Autores: Leite,Lorena Alves; Quaresma,Fabrízia da Silva; Ribeiro,Pedro Florêncio; Farias,Wladimir Ronald Lobo; Souza,Bartolomeu Warlene Silva de.
ABSTRACT Nile tilapia (Oreochromis niloticus) is a euryhaline species which, in marine systems, can provide animal protein where fresh water is scarce. As a result, adequate water management to maintain sustainability is essential, and the use of a salt water recirculating system would be an advantage at the present time. In addition, Arthrospira platensis is used in the diet of aquatic organisms, as it is rich in protein. The aim of this study, therefore, was to evaluate the use of A. platensis as a food supplement in the performance of Nile tilapia in a salt water recirculating system. The experimental model included two groups, with four replications. Each crop had a duration of 45 days (control and test), giving a total of 90 days, with the control...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microalgae; Pisciculture; Recirculation; Salinity.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902019000400593