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Fatty Acid Profile of Sunshine Bass: II. Profile Change Differs Among Fillet Lipid Classes
Author(s) -
Trushenski Jesse T.,
Lewis Heidi A.,
Kohler Christopher C.
Publication year - 2008
Publication title -
lipids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.601
H-Index - 120
eISSN - 1558-9307
pISSN - 0024-4201
DOI - 10.1007/s11745-008-3190-5
Subject(s) - polyunsaturated fatty acid , food science , fish oil , chemistry , linseed oil , fillet (mechanics) , fatty acid , bass (fish) , zoology , biochemistry , biology , fishery , fish <actinopterygii> , materials science , composite material
Fatty acid (FA) profile of fish tissue mirrors dietary FA profile and changes in a time‐dependent manner following a change in dietary FA composition. To determine whether FA profile change varies among lipid classes, we evaluated the FA composition of fillet cholesteryl esters (CE), phospholipids (PL), and triacylglycerols (TAG) of sunshine bass (SB, Morone chrysops × M. saxatilis ) raised on feeds containing fish oil or 50:50 blend of fish oil and coconut, grapeseed, linseed, or poultry oil, with or without implementation of a finishing period (100% FO feed) prior to harvest. Each lipid class was associated with a generalized FA signature, irrespective of nutritional history: fillet PL was comprised largely of saturated FA (SFA), long‐chain polyunsaturated FA (LC‐PUFA), and total n‐3 FA; fillet TAG was higher in MC‐PUFA and total n‐6 FA; and fillet CE was highest in monounsaturated FA (MUFA). Neutral lipids reflected dietary composition in a near‐direct fashion; conversely, PL showed evidence of selectivity for MC‐ and LC‐PUFA. Shorter‐chain SFA were not strongly reflected within any lipid fraction, even when dietary availability was high, suggesting catabolism of these FA. FA metabolism in SB is apparently characterized by a division between saturated and unsaturated FA, whereby LC‐PUFA are preferentially incorporated into tissues and SFA are preferentially oxidized for energy production. We demonstrated provision of SFA in grow‐out feeds for SB, instead MC‐PUFA which compete for tissue deposition, meets energy demands and allows for maximum inclusion of LC‐PUFA within fillet lipids.