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Registros recuperados: 5
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Comparative growth and welfare in rainbow trout reared in recirculating and flow through rearing systems ArchiMer
Roque D'Orbcastel, Emmanuelle; Person, Jeannine; Le Bayon, Nicolas; Blancheton, Jean-paul.
The objective of this study was to compare fish performance and welfare at different stocking densities in a recirculating system (RS) and a flow through system (FTS) under field conditions. During the 77 days experiment, the fish survival rate was high (99.3%) and stocking density increased from 57 to 98108 kg m(-3). No significant differences in growth were observed between RS and FTS until day 56. Later, growth decreased in the FTS, while it remained similar to the farm reference at 50 kg m(-3) in the RS. Final weight was 17% higher in RS than in FTS. The maximum carrying capacity of the RS was near 100 kg m(-3), limited by NO2 increase up to safe level at the end of the experiment, the maximum carrying capacity of the FTS was near 85 kg m(-3), probably...
Tipo: Text Palavras-chave: Welfare; Fin; Performance; Stocking density; Recirculating system.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6509.pdf
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Optimisation des conditions hydrobiologiques pour la conservation de l'huître creuse Crassostrea gigas en système re-circulé ArchiMer
Buzin, Florence.
The maintenance of bivalve commercialisation du ring periods when sales are prohibited represents a major economic issue for shellfish-farming. To ensure their survival and to preserve the oyster Crassostrea gigas quality, their storage in land-based systems has been studied i) out of water in a cold room at 3°C with controlled humidity, enabling the bivalve sensory quality to be retained for 15 days, and ii) in recirculating systems in immersed conditions for 30 days. For the latter, the oysters were stored at 167 kg.m3 density in a tank equipped with an air-lift system, with water treated with UV and thermoregulated. A minimum of food was supplied to avoid mass tissue loss. A temperature of 16°C was defined as optimal to limit mortality and to avoid...
Tipo: Text Palavras-chave: Crassostrea gigas; Huître Pacifique; Système re-circulé; Ecophysiologie; Sauvegarde; Modélisation; Crassostrea gigas; Pacific oyster; Recirculating system; Ecophysiology; Safeguard; Modelling.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00092/20350/17995.pdf
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Storage of Pacific oysters Crassostrea gigas in recirculating tank: ammonia excretion and potential nitrification rates ArchiMer
Buzin, Florence; Dupuy, Beatrice; Lefebvre, Sebastien; Barille, Laurent; Haure, Joel.
In response to the closure of shellfish production sites due to increasing occurrence of toxic algal blooms, land-based recirculating aquaculture systems (RAS) could be used by producers to store a proportion of their stock temporarily. An RAS prototype was tested in this study to store Pacific oyster Crassostrea gigas over a range of temperatures. In such systems, the water temperature is a variable that could influence the bivalve excretion rate of ammonia, the concentration of which may become critical for the water quality. In this study, we first estimated the total ammonia nitrogen (TAN, N-NH4+ + N-NH3) excretion of the Pacific oyster and then investigated whether the bacterial population associated with the oysters could act as a natural biofilter...
Tipo: Text Palavras-chave: Crassostrea gigas; Ammonia excretion; Nitrification rate; Recirculating system; Temperature.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00248/35889/34409.pdf
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The effect of density on sea bass (Dicentrarchus labrax) performance in a tank-based recirculating system ArchiMer
Sammouth, Sophie; Roque D'Orbcastel, Emmanuelle; Gasset, Eric; Lemarie, Gilles; Breuil, Gilles; Marino, Giovanna; Coeurdacier, Jean-luc; Fivelstad, Sveinung; Blancheton, Jean-paul.
Sea bass (Dicentrarchus tabrax) (135 +/- 4 g) were reared under tank-based recirculating aquaculture system for a 63-day period at four densities: 10, 40, 70, 100 kg m(-3). Fish performance, stress indicators (plasma cortisol, proteonemia plus other blood parameters-Na+, K+, glucose, pH, total CO2- and water quality were monitored. At the end of the 63-day period, resistance to infection was also studied by a nodavirus challenge. A 25-day test was performed on fish from two extreme densities (10 and 100 kg m(3)) and one intermediate density (40 kg m(3)). With regards to the different density treatments, there was no significant difference between the daily feed intake (DFI) and the specific growth rate (SGR) up to a density of 70 kg m(-3). No significant...
Tipo: Text Palavras-chave: Welfare; Performance; European sea bass; Recirculating system; Density.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6761.pdf
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Water quality and rainbow trout performance in a Danish Model Farm recirculating system: Comparison with a flow through system ArchiMer
Roque D'Orbcastel, Emmanuelle; Blancheton, Jean-paul; Belaud, Alain.
The objective was to compare water quality and fish growth and mortality in a pilot scale recirculating system (RS) and a control tank in flow through system (FTS). The RS was designed after the Danish Model Trout Farm and operated with a make Lip Water renewal rate of 9 m(3) kg(-1) of fish produced. RS water quality did not decrease significantly with water flow rate decrease in the RS. During the experiment, the RS water treatment system presented solids removal efficiency of 59.6 +/- 27.7% d(-1), ammonia oxidation of 45 +/- 32 g m(-3) d(-1), oxygenation yield of 392 +/- 132 g of O-2 kWh(-1) and CO2 degassing of 23.3 +/- 11.9% pass(-1). In the RS, nitrite concentration was 0.15 +/- 0.07 mg l(-1), close to the toxicity threshold; a N-2 supersaturation...
Tipo: Text Palavras-chave: Energy cost; Water quality; Flow rate; Treatment system; Performance; Trout; Recirculating system.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6506.pdf
Registros recuperados: 5
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