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Fatty Acid Profile of Sunshine Bass: I. Profile Change is Affected by Initial Composition and Differs Among Tissues
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/s11745-008-3188-z
Subject(s) - fish oil , polyunsaturated fatty acid , food science , linseed oil , fatty acid , feed conversion ratio , fillet (mechanics) , chemistry , biology , biochemistry , fishery , fish <actinopterygii> , body weight , materials science , composite material , endocrinology
Fatty acid (FA) composition of fillet tissue can be tailored by transitioning fish from alternative lipid‐based, low long‐chain polyunsaturated fatty acid (LC‐PUFA) grow‐out feeds to high LC‐PUFA “finishing” feeds. To address whether grow‐out feed composition influences the responsiveness of fillet tissue to finishing, sunshine bass (SB, Morone chrysops × M. saxatilis ) were reared to a submarketable size on grow‐out feeds containing fish oil (FO) or a 50:50 blend of FO and coconut (CO), grapeseed (GO), linseed (LO), or poultry (PO) oil. For the final 8 weeks of the trial, fish were either maintained on assigned grow‐out feeds or finished with the 100% FO feed. Production performance was unaffected by dietary lipid source, but fillet FA profile generally conformed to nutritional history. Regardless of grow‐out regimen, finishing had a significant restorative effect on fillet FA composition; however, complete restoration of control levels of 20:5n‐3, 22:6n‐3, total LC‐PUFA and n‐3:n‐6 FA ratio was achieved only among fish fed the CO‐based grow‐out feed. Saturated fatty acids (SFA) appear to be preferential catabolic substrates, whereas medium‐chain and long‐chain PUFA are selectively deposited in tissues. Provision of SFA in grow‐out feeds appears to optimize selective FA metabolism and restoration of beneficial fillet FA profile during finishing.