The effect of density on sea bass (Dicentrarchus labrax) performance in a tank-based recirculating system |
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| Authors: | Sophie Sammouth Emmanuelle Roque d’Orbcastel Eric Gasset Gilles Lemarié Gilles Breuil Giovanna Marino Jean-Luc Coeurdacier Sveinung Fivelstad Jean-Paul Blancheton |
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| Institution: | 1. Animal Breeding and Genomics Centre, Wageningen University, PO Box 338, 6700 AH Wageningen, The Netherlands;2. Génétique animale et biologie intégrative, INRA, AgroParisTech, Université Paris-Saclay, 78350 Jouy-en-Josas, France;3. IFREMER, Chemin de Maguelone, 34250 Palavas-les-Flots, France;4. INRA, Agrocampus Ouest, UMR1069 Sol Agronomie Spatialisation, 65 rue de Saint Brieuc, 35042 Rennes, France;5. Animal Production Systems Group, Wageningen University, PO Box 338, 6700 AH, The Netherlands;1. Zuckerberg Institute for Water Research, J. Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Israel;2. Department of Marine Biotechnology, Institute of Marine and Environmental Technology, University of Maryland Baltimore County, Baltimore, MD 21202, United States;3. Israeli Ministry of Agriculture and Rural Development, Department of Fishery and Aquaculture, Beit Dagan 50250, Israel;1. Departamento de Biología, Facultad de Ciencias del Mar y Ambientales, Campus de Excelencia Internacional del Mar (CEI-MAR), University of Cádiz, E-11510 Puerto Real Cádiz, Spain;2. Instituto de Ciencias Marinas de Andalucía, Consejo Superior de Investigaciones Científicas (ICMAN-CSIC), E-11510 Puerto Real Cádiz, Spain;3. Dpto. Producción, IFAPA Centro “El Toruño”, Junta de Andalucía, E-11500 El Puerto de Santa María Cádiz, Spain |
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| Abstract: | Sea bass (Dicentrarchus labrax) (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 m3) and one intermediate density (40 kg m3).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 difference was found between treatments concerning the feed conversion ratio (FCR) and the mortality rate. No density effect was observed on the fish stress level (plasma cortisol) or on sensitivity to the nodavirus challenge. Under these experimental rearing conditions, the density above 70 kg m?3 has an impact on growth performance (DFI and SGR) indicators and also some blood parameters (CO2) at the highest density tested (100 kg m?3).This study suggests that a density up to 70 kg m?3 has no influence on sea bass performance and welfare. At 100 kg m?3, average specific growth rate was decreased by 14% without welfare deterioration according to the welfare indicators monitored. |
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