English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/45807
logo share SHARE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Dietary Lecithin Source Affects Growth Potential and Gene Expression in Sparus aurata Larvae

AuthorsAlves Martins, D.; Estévez, Alicia; Stickland, Neil C.; Simbi, Bigboy; Yúfera, Manuel
KeywordsDietary lipid
Stocking density
Gilthead seabream
Fatty acids
Gene expression
Issue Date10-Sep-2010
American Oil Chemists' Society
CitationLipids 45(11): 1011-1023 (2010)
AbstractSoybean lecithin (SBL), used as a phospholipid source in larval fish diets, may compromise growth and survival in marine species, and affect gene expression, due to differences in fatty acid composition relative to marine lecithins (ML). The potential of SBL as a phospholipid source in gilthead seabream microdiets as compared to ML was evaluated. Two stocking densities were tested in order to exacerbate possible dietary effects: 5 and 20 larvae L−1. Larvae reflected dietary fatty acid profiles: linoleic acid was higher, whereas eicosapentaenoic and arachidonic acids were lower in SBL fed groups than in ML fed larvae. Highest stocking density decreased survival, and led to elevated saturates and lower docosahexaenoic acid levels in polar lipid. Muscle histology observations showed hindered growth potential in SBL fed larvae. Despite similar cortisol levels between treatments, higher glucocorticoid receptor (GR), as well as hormone-sensitive lipase (HSL) mRNA levels in SBL fed groups revealed a role for fatty acids in gene regulation. Further analysed genes suggested these effects were independent from the hypothalamus-pituitary-interrenal axis control and the endocannabinoid system. Cyclooxygenase-2 and gluconeogenesis seemed unaffected. For the first time in fish, a link between dietary lecithin nature and HSL gene transcription, perhaps regulated through GR fatty acid-induced activation, is suggested. Enhanced lipolytic activity could partly explain lower growth in marine fish larvae when dietary ML is not provided.
Description13 páginas, 5 figuras, 7 páginas.
Publisher version (URL)http://dx.doi.org/10.1007/s11745-010-3471-7
Appears in Collections:(ICMAN) Artículos
Files in This Item:
File Description SizeFormat 
dietary_lecithin_Alves.pdf775,79 kBAdobe PDFThumbnail
Show full item record
Review this work

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.