High levels of vegetable oils in plant protein-rich diets fed to gilthead sea bream (Sparus aurata L.): growth performance, muscle fatty acid profiles and histological alterations of target tissues
|Author(s)||Benedito Palos L1, Navarro J1, Sitja Bobadilla A1, Bell J2, Kaushik Sadasivam3, 4, Perez Sanchez J1|
|Affiliation(s)||1 : Inst Aquaculture Torre Sal CSIC, Dept Biol Culture & Pathol Marine Species, Ribera De Cabanes 12595, Castellon, Spain.
2 : Univ Stirling, Inst Aquaculture, Stirling FK9 4LA, Scotland.
3 : Univ Bordeaux 1, UMR Nutr Aquaculture & Genom, Unite Mixte INRA, IFREMER, F-64310 St Pee Sur Nivelle, France.
|Source||British Journal of Nutrition (0007-1145) (Cambridge Univertsity Press), 2008-11 , Vol. 100 , N. 5 , P. 992-1003|
|WOS© Times Cited||136|
|Keyword(s)||Lipoid liver disease, Soya lecithin, Phospholipids, Essential fatty acids|
|Abstract||The feasibility of fish oil (FO) replacement by vegetable oils (VO) was investigated in gilthead sea bream (Sparus aurata L.) in a growth trial conducted for the duration of 8 months. Four isolipidic and isoproteic diets rich in plant proteins were Supplemented with L-lysine (0-55%) and soya lecithin (1%). Added oil was either FO (control) or a blend of VO, replacing 33% (33VO diet), 66% (66VO diet) and 100% (VO diet) of FO. No detrimental effects on growth performance were found with the partial FO replacement, but feed intake and growth rates were reduced by about 10% in fish fed the VO diet. The replacement strategy did not damage the intestinal epithelium, and massive accumulation of lipid droplets was not found within enterocytes. All fish showed fatty livers, but signs of lipoid liver disease were only found in fish fed the VO diet. Muscle fatty acid profiles of total lipids reflected the diet composition with a selective incorporation of unsaturated fatty acids it) polar lipids. The robustness of the phospholipid fatty acid profile when essential fatty acid requirements were theoretically covered by the diet was evidenced by multivariate principal components analysis in fish fed control. 33VO and 66VO diets.|