title: Dietary fish oil replacement with lard and soybean oil affects triacylglycerol and phospholipid muscle and liver docosahexaenoic acid content but not in the brain and eyes of surubim juveniles Pseudoplatystoma sp.
abstract: Triplicate groups of juvenile suribim were fed for 183 days one of four different isonitrogenous (47.6% crude protein) and isolipidic (18.7% lipid) diets formulated using three different lipid sources: 100% fish oil (FO, diet 1); 100% pig lard (L, diet 2); 100% soybean oil (SO, diet 3), and FO/L/SO (1:1:1, w/w/w; diet 4). The tissue levels of fatty acids 18:2n-6 and 18:3n-3 decreased relative to corresponding dietary fatty acid values. The 20:5n-3 and 22:6n-3 composition of muscle and liver neutral lipids were linearly correlated with corresponding dietary fatty acid composition. In contrast, the 22:6n-3 composition of the brain and eye were similar among treatments. The 22:6n-3 level was enriched in all tissues, particularly in the neural tissues. Similar results were observed for tissue polar lipids: fatty acids content reflected dietary composition, with the exception of the 22:6n-3 level, which showed enrichment and no differences between groups. Given these results, the importance of the biochemical functions (transport and/or metabolism) of 22:6n-3 in the development of the neural system of surubim warrants further investigation.
authors.affiliation: Instituto de Química (CT), Universidade Federal do Rio de Janeiro-Laboratório de Bioquímica Nutricional e de Alimentos, Bl. A Lab. 528, Ilha do Fundão, 21949-900, Rio de Janeiro, RJ, Brazil.
authors.forename: M D
authors.initials: MD
authors.lastname: Noffs
authors.forename: R C
authors.initials: RC
authors.lastname: Martino
authors.forename: L C
authors.initials: LC
authors.lastname: Trugo
authors.forename: E C
authors.initials: EC
authors.lastname: Urbinati
authors.forename: J B K
authors.initials: JB
authors.lastname: Fernandes
authors.forename: L S
authors.initials: LS
authors.lastname: Takahashi
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D017756:Aquaculture; D001921:Brain / Q000378:metabolism*; D002397:Catfishes / Q000378:metabolism*; D002849:Chromatography, Gas; D004041:Dietary Fats / Q000008:administration & dosage; D004281:Docosahexaenoic Acids / Q000378:metabolism*; D005123:Eye / Q000378:metabolism*; D005395:Fish Oils / Q000008:administration & dosage; D008099:Liver / Q000378:metabolism*; D018482:Muscle, Skeletal / Q000378:metabolism*; D013024:Soybean Oil / Q000008:administration & dosage
chemical_list: D004041:Dietary Fats; D005395:Fish Oils; D004281:Docosahexaenoic Acids; D013024:Soybean Oil; C029310:lard