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Effects of rearing density on sea bass (Dicentrarchus labrax) biological performance, blood parameters and disease resistance in a flow through system

Published online by Cambridge University Press:  23 December 2009

Emmanuelle Roque d'Orbcastel ,
Gilles Lemarié ,
Gilles Breuil ,
Tommaso Petochi ,
Giovanna Marino ,
Sébastien Triplet ,
Gilbert Dutto ,
Sveinung Fivelstad ,
Jean- Luc Coeurdacier  and
Jean-Paul Blancheton
Emmanuelle Roque d'Orbcastel
Affiliation:
Ifremer, Chemin de Maguelone, 34250 Palavas-les-Flots, France
Gilles Lemarié
Affiliation:
Ifremer, Chemin de Maguelone, 34250 Palavas-les-Flots, France
Gilles Breuil
Affiliation:
Ifremer, Chemin de Maguelone, 34250 Palavas-les-Flots, France
Tommaso Petochi
Affiliation:
ISPRA, Aquaculture Unit, Via Casalotti 300, Rome 00166, Italy
Giovanna Marino
Affiliation:
ISPRA, Aquaculture Unit, Via Casalotti 300, Rome 00166, Italy
Sébastien Triplet
Affiliation:
Ifremer, Chemin de Maguelone, 34250 Palavas-les-Flots, France
Gilbert Dutto
Affiliation:
Ifremer, Chemin de Maguelone, 34250 Palavas-les-Flots, France
Sveinung Fivelstad
Affiliation:
Bergen University College, Nygårdsgaten 114, 5020 Bergen, Norway
Jean- Luc Coeurdacier
Affiliation:
Ifremer, Chemin de Maguelone, 34250 Palavas-les-Flots, France
Jean-Paul Blancheton
Affiliation:
Ifremer, Chemin de Maguelone, 34250 Palavas-les-Flots, France
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Abstract

During 84 days, the effects of density on juvenile sea bass (Dicentrarchus labrax) (76±16 g) were studied in an experimental tank-based flow through system. Performance, stress response and resistance to virus infection were analysed under five stabilized rearing densities: 10, 20, 40, 70 and 100 kg m-3. Water quality parameters (CO2, total ammonia nitrogen and O2) were measured and maintained close to the recommended values for farmed sea bass by adjusting water renewal exchange. No significant differences were observed between density treatments, neither on stress response (cortisol) nor susceptibility to nodavirus. With regards to biological performances, the daily feed intake and specific growth rate were significantly lower in fish reared at the 100 kg m-3 density. Results on the effects of density in sea bass reared in flow through (present study) and in recirculating aquaculture systems (RAS) (Sammouth et al. 2009) were compared as a contribution to the identification of density not affecting health and welfare in farmed sea bass.

Keywords

Rearing densityFlow through systemStressWater qualitySea bass
Type
Research Article
Information
Aquatic Living Resources , Volume 23 , Issue 1 , January 2010 , pp. 109 - 117
Copyright
© EDP Sciences, IFREMER, IRD, 2009

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