The effects of dietary lipid and strain difference on polyunsaturated fatty acid composition and conversion in anadromous and landlocked salmon (Salmo salar L.) parr.

Five experimental diets containing different proportions of olive, sunflower and linseed oils were used in a 55-day feeding trial on both anadromous and landlocked parr of Atlantic salmon (Salmo salar) of the same age, in order to study the effects of diet and strain on growth and fatty acid composi...

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Bibliographic Details
Published in:Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology
Main Authors: Rollin, Xavier, Peng, Jinglan, Pham, Diep, Ackman, Robert G, Larondelle, Yvan
Other Authors: UCL - AGRO/BAPA - Département de biologie appliquée et des productions agricoles
Format: Article in Journal/Newspaper
Language:English
Published: 2003
Subjects:
Adipose Tissue
Animals
Atlantic Ocean
Body Composition
Data Interpretation
Statistical
Diet
Dietary Fats
Fatty Acids
Unsaturated
Linoleic Acid
Plant Oils
Salmo salar
Atlantic salmon
Online Access:http://hdl.handle.net/2078.1/9371
https://doi.org/10.1016/S1096-4959(02)00264-6
Description
Summary:Five experimental diets containing different proportions of olive, sunflower and linseed oils were used in a 55-day feeding trial on both anadromous and landlocked parr of Atlantic salmon (Salmo salar) of the same age, in order to study the effects of diet and strain on growth and fatty acid composition and absolute gains in fish whole body triacylglycerols (TAG) and phospholipids (PL). Growth rate was higher in landlocked than in anadromous parr, but not between the different diets. By contrast, the effect of diet on whole body fatty acid composition was much more pronounced than that of strain difference. The fatty acids deposition results establish significant (P<0.05) positive correlations and linear relationships between the percentage of several fatty acids (18:1n-9, 18:2n-6, 18:3n-3) in dietary lipids and their absolute gains in whole body TAG and PL of both stocks. They also indicate the selective deposition of 18:1n-9 compared with linoleic acid (LLA) and linolenic acid (LNA). Finally, the results suggest the occurrence of the conversion of LLA and LNA to long-chain polyunsaturated fatty acids, its stimulation by increased substrate availability, a significantly higher n-3 and n-6 polyunsaturated fatty acids conversion capacity in landlocked than in anadromous parr and a strong genetic influence on docosahexaenoic acid content in salmon parr PL.

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