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Biofiltração da água e tipos de substrato na larvicultura do pacamã. Repositório Alice
PEDREIRA, M.M.; LUZ, R.K.; SANTOS, J.C.E. dos; SAMPAIO, E.V.; SILVA, R.S.F..
O objetivo deste trabalho foi avaliar o uso de diferentes biofiltros e substratos na qualidade da água e no desempenho de larvas de Lophiosilurus alexandri. Os tratamentos usados foram: sistema sem biofiltro (SB); biofiltro interno ao tanque com substrato de cascalho de diâmetro médio de 1,6 cm (CMe); biofiltro interno ao tanque com cascalho de diâmetro médio de 2,1 cm (CMa); biofiltro interno ao tanque com substrato constituído de uma mistura de 70% de brita (diâmetro médio de 1,3 cm) e 30% de concha (diâmetro médio de 1,1 cm) (CB); e sistema fechado (SF) com biofiltro externo aos tanques, com substrato de brita e concha. O experimento foi realizado em delineamento inteiramente casualizado, com cinco tratamentos e cinco repetições, durante 16 dias. Para...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Artemia; Lophiosilurus alexandri; Qualidade da água; Resíduo orgânico; Sistema de recirculação de água; Water quality; Organic waste; Recirculating aquaculture system.
Ano: 2009 URL: http://www.alice.cnptia.embrapa.br/handle/doc/125874
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C/N ratio-induced structural shift of bacterial communities inside lab-scale aquaculture biofilters ArchiMer
Michaud, Luigi; Lo Giudice, Angelina; Interdonato, Filippo; Triplet, Sebastien; Ying, Luo; Blancheton, Jean-paul.
In Recirculating Aquaculture Systems (RAS) various chemical compounds (mainly nitrates and organic carbon) accumulate in the rearing water. These chemical substrata regulate the ecophysiology of the bacterial communities of the biofilter and have an impact on its nitrification efficiency and reliability. In the present study chemical and microbiological parameters in static mineral bed (SBB) and moving plastic bed (MBB) biological filters were monitored at increasing C/N ratios ranging from 0 (pure nitrification) to 4 (combined nitrification and organic carbon removal), with the aim to investigate the shift of the bacterial community structure and major taxa relative abundances. Results suggest that the MBB are less subjected to the nitrification...
Tipo: Text Palavras-chave: Recirculating aquaculture system; Biofilters; C/N ratio; Microbial community structure.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00167/27846/26070.pdf
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Economic values of growth and feed efficiency for fish farming in recirculating aquaculture system with density and nitrogen output limitations: a case study with African catfish (Clarias gariepinus) ArchiMer
Besson, M.; Komen, H.; Aubin, J.; De Boer, I. J. M.; Poelman, M.; Quillet, Edwige; Vancoillie, C.; Vandeputte, Marc; Van Arendonk, J A M.
In fish farming, economic values (EV) of breeding goal traits are lacking, even though they are key parameters when defining selection objectives. The aim of this study was to develop a bioeconomic model to estimate EV of 2 traits representing production performances in fish farming: the thermal growth coefficient (TGC) and the feed conversion ratio (FCR). This approach was applied to a farm producing African catfish (Clarias gariepinus) in a recirculating aquaculture system (RAS). In the RAS, 2 factors could limit production level: the nitrogen treatment capacity of the biofilter or the fish density in rearing tanks at harvest. Profit calculation includes revenue from fish sales, cost of juveniles, cost of feed, cost of waste water treatment, and fixed...
Tipo: Text Palavras-chave: Economic values; Feed conversion ratio; Fish farming; Recirculating aquaculture system; Selective breeding; Thermal growth coefficient.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00245/35593/34277.pdf
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Effect of particulate organic carbon on heterotrophic bacterial populations and nitrification efficiency in biological filters ArchiMer
Michaud, Luigi; Blancheton, Jean-paul; Bruni, V; Piedrahita, Raul.
Competition between heterotrophic and nitrifying bacteria is of major practical importance in aquaculture biofilter design and operation. This competition must be understood to minimize the negative impact of heterotrophic bacteria on an aquaculture system. On the other hand, the heterotrophic population is suspected of having a positive effect against pathogenic bacteria. Little information is available on the bacterial communities present within aquaculture systems, except for nitrifying bacteria, but a combination of traditional aquacultural engineering research methods and novel microbiological techniques offers new opportunities for the study of these communities. The heterotrophic bacterial population activity and the nitrification efficiency of a...
Tipo: Text Palavras-chave: Recirculating aquaculture system; Particulate organic matter; Heterotrophic bacteria; Nitrification.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1553.pdf
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Environmental impacts of genetic improvement of growth rate and feed conversion ratio in fish farming under rearing density and nitrogen output limitations ArchiMer
Besson, M.; Aubin, J.; Komen, H.; Poelman, M.; Quillet, E.; Vandeputte, Marc; Van Arendonk, J. A. M.; De Boer, I. J. M..
Today, fish farming faces an increasing demand in fish products, but also various environmental challenges. Genetic improvement in growth rate and feed conversion ratio is known to be an efficient way to increase production and increase efficiency in fish farming. The environmental consequences of genetic improvement in growth rate and feed conversion ratio, however, are unknown. In this study, we investigated the environmental consequences of genetic improvement in growth rate and feed conversion ratio in an African catfish farm, using Recirculating Aquaculture System (RAS). In RAS, total fish production of the farm is limited by rearing density or by the capacity to treat dissolved nitrogen. To evaluate the environmental consequences of genetic...
Tipo: Text Palavras-chave: Life cycle assessment; African catfish; Feed efficiency; Recirculating aquaculture system; Selection; Thermal growth coefficient.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00302/41355/40546.pdf
Registros recuperados: 5
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