Cod Larviculture Using High-density Rotifer Production with Different Enrichments

• Published in: Journal of the World Aquaculture Society
• Main Authors: Hache, Remy, Plante, Sebastien, Forward, Benjamin S., Pernet, Fabrice
• Other Authors: Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2017
• Subjects: ACL; gadus-morhua; fatty-acid-composition; placopecten-magellanicus; bacterial-flora; brachionus-plicatilis; enriched rotifers; mass-culture; recirculation system; sparus-aurata l; vibrio-anguillarum; [SDE.BE]Environmental Sciences/Biodiversity and Ecology; Gadus morhua; Rotifer
• Online Access: https://hal.science/hal-02577610; https://doi.org/10.1111/jwas.12310

WOS:000397021200006 High-density (HD) rotifer culture systems have been recently commercialized, but are not commonly used by the aquaculture industry. The aim of this study was to determine if HD systems could be used in cod hatcheries. An enrichment strategy using the commercial products, ArteMac and Protein Selco Plus (Com), was compared with the manufacturer's suggested enrichment, using Pavlova-DHA (Pav). The Pav enrichment increased the eicosapentaenoic acid (EPA) levels in rotifers, but reduced the docosahexaenoic acid (DHA) and 22: 5n-6 (n-6DPA, docosapentaenoic acid) levels. Larvae EPA levels in both polar and neutral lipids were relatively stable in the larvae fed with Com-rotifers; while they were higher in early stages, they were progressively reduced through ontogeny in the Pav-rotifers fed-larvae. DHA levels in polar lipids decreased in larvae, particularly when fed with HD-Pav rotifers. In all larvae, arachidonic acid (ARA) levels increased in the polar and neutral lipids, regardless of treatments. In both lipid fractions, the levels of ARA were quite stable in time, but still higher in larvae fed with Com-rotifers. Bacterial load was lower in larvae fed with Pav-rotifers. Denaturing gradient gel electrophoresis (DGGE) bacterial profiles of larvae and rotifers were all similar. This study shows the potential of usingHDsystems to produce rotifers, but highlights the necessity of adjusting the nutritional composition of rotifers prior to being fed to larvae.