Effect of water recirculation on seawater quality and production of scallop (Pecten maximus) larvae |
| |
| Institution: | 1. KU Leuven Kulak, Research Unit Food & Lipids, E. Sabbelaan 53, 8500 Kortrijk, Belgium;2. Leuven Food Science and Nutrition Research Centre (LFoRCe), KU Leuven, Kasteelpark Arenberg 20, 3001 Leuven, Belgium;3. KU Leuven, Department of Biosystems, MeBioS division, Kasteelpark Arenberg 30, 3001 Leuven, Belgium;4. University of Antwerp, Department of Engineering Management, Prinsstraat 13, 2000 Antwerpen, Belgium;5. Technologiecluster Bioengineering Technology, Campus Brugge, Spoorwegstraat 12 - bus 7913, 8200 Sint-Michiels, Belgium;6. Departement Microbiële en Moleculaire Systemen, KU Leuven, Kasteelpark Arenberg 23 - bus 246, 3001 Leuven, Belgium;7. KU Leuven Kulak, Laboratory Aquatic Biology, E. Sabbelaan 53, 8500 Kortrijk, Belgium;1. Universidad Peruana Cayetano Heredia (UPCH), Av. Honorio Delgado 430, Distrito de Lima, Peru;2. Laboratorio de Modelado Oceanográfico, Ecosistémico y del Cambio Climático (LMOECC), Instituto del Mar del Peru (IMARPE), Esquina Gamarra y General Valle S/N Chucuito Callao, Peru;3. Institut de Recherche pour le Développement (IRD), UMMISCO, Sorbonne Université, Université Cheikh Anta Diop, Campus international UCAD/IRD de Hann, Dakar, Senegal.;4. Institut de Recherche pour le Développement (IRD), UMR LOCEAN, Sorbonne Universités (UPMC)/CNRS/MNHN, Paris 75252, France;5. Institut de Recherche pour le Développement (IRD), UBO, CNRS, Ifremer, LEMAR, IUEM, Plouzané, France;6. Laboratorio de Ecofisiologia Acuatica, Instituto del Mar del Peru (IMARPE), Esquina Gamarra y General Valle S/N Chucuito Callao, Peru;7. Universidad Nacional Agraria La Molina, Av. La Molina s/n La Molina, Peru;8. Institut de Recherche pour le Développement (IRD), Sorbonne Université, Unité de Modélisation Mathématique et Informatique des Systèmes Complexes, UMMISCO, F-93143, Bondy, France |
| |
| Abstract: | Scallop larval production systems in Norway have changed from the use of batch to continuous flow through systems (FTS) during the last decade. Energy use to heat water in both larval and spat nurseries is considerable. Two experiments (June 2010 and February 2011) using water recirculation technology (RAS) were performed in large scale systems (3500 L larval tanks) supplied with continuous addition of algal feed, and 20% renewal of seawater.In the RAS a gradual increase in CO2, decrease in pH and dissolved oxygen was observed over time. This was most obvious during experiment two, when the total organic carbon content increased in both FTS and RAS. The total bacterial number was lower and more stable in FTS than in the RAS. The variations in seawater quality parameters were smaller during the first experiment compared to the second, when values of oxygen saturation were reduced to <70%, pH was 7.8 and NO3− reached 5 mg L−1. Even though these changes would seem less beneficial for survival and growth of scallop larvae, results showed that the survival at the end of the larval stage was higher in the FTS, but the yield of competent larvae ready for settlement was not significant different (p > 0.05) due to large variations between tanks. The CV% was 28.9% in FTS, while it was 49.9% in RAS. In FTS the mean yield was 40.2%, while it was 26.5% of initial number of larvae in RAS. Large variations in survival and yield were found between the larval tanks as well as gradual reduction in pH and oxygen in RAS tanks. The results indicate that there is a large potential for 80% reduction in water use by utilizing recirculation technology. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
