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.
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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.
KeywordsFish oil Lipid metabolism Phospholipids Pig lard Polyunsaturated fatty acids Pseudoplatystoma sp. Soybean oil Triacylglycerols
The authors are grateful to “Projeto Pacu”, Brazil for providing the experimental fish, to Nutron Alimentos and Mogiana Alimentos, Brazil for providing some of the diet ingredients, and to Dr. Juliette Delabbio of Aquaculture Research Station of Northwestern State University, Louisiana, USA for the English review of this manuscript. The authors are also grateful to the Rio de Janeiro State Research Support Foundation (FAPERJ) (Grant: E/26-170.987-03) as a partial sponsor of this work and to Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for the doctorate scholarship of Mr. M. D. Noffs.
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