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Auteur (up) ROQUE D'ORBCASTEL, E.; BLANCHETON, J.-P.; BELAUD, A. url  openurl
  Titre Water quality and rainbow trout performance in a Danish Model Farm recirculating system: Comparison with a flow through system Type Article scientifique
  Année 2009 Publication Aquacultural Engineering Revue Abrégée  
  Volume 40 Numéro 3 Pages 135-143  
  Mots-Clés Energy cost; Water quality; Flow rate; Treatment system; Performance; Trout; Recirculating system  
  Résumé 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 phenomenon was measured, probably due to the air injection depth. The biofilter and sedimentation area management has to be improved to avoid Organic matter decomposition and release of dissolved elements. Even if no N-2 over-saturation apparent effect on fish performance and aspect were detected, the airlift depth has to be modified in the case of industrial development of the RS. Some improvements of the water treatment system, especially on the airlift and sedimentation area, are suggested. Concerning fish growth, no significant differences were observed between the RS and the FTS. No pathologies were detected and cumulative mortality rates (0.1%) were similar to the farm's Usual data. There were no significant effects of water flow rate decrease in the RS on fish performance and energy savings were recorded to be 0.7 kWh kg(-1) of fish produced between RS1 and RS2. The global energy cost of the RS was 3.56 kWh kg(-1) of fish produced (0.107 (sic) kg(-1) of fish produced). Even if the energy consumption of the water treatment system can be improved, the results confirm that recirculating system can be used for industrial trout On growing, without fish performance deterioration. (C) 2009 Elsevier B.V. All rights reserved.  
  Adresse Ecole Natl Super Agron Toulouse, ENSAT, F-31326 Castanet Tolosan, France.  
  Auteur institutionnel Thèse  
  Editeur Elsevier Lieu de Publication Éditeur  
  Langue Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 0144-8609 ISBN Médium  
  Région Expédition Conférence  
  Notes Approuvé pas de  
  Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ 6506 collection 1227  
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