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Replacement of dietary fish oils by alpha-linolenic acid-rich oils lowers omega 3 content in tilapia flesh.
Lipids. 2007 Jun; 42(6):547-59.L

Abstract

A 20-week feeding trial was conducted to determine whether increasing linolenic acid (18:3n-3) in vegetable oil (VO) based diets would lead to increased tissue deposition of 22:6n-3 in Nile tilapia (Oreochromis niloticus). Five isonitrogenous and isoenergetic diets were supplemented with 3% of either linseed oil (LO), a mixture of linseed oil with refined palm olein oil (PO) (LO-PO 2:1) and a mixture of refined palm olein oil with linseed oil (PO-LO 3:2) or with fish oil (FO) or corn oil (CO) as controls. The PO-LO, LO-PO and LO diets supplied a similar amount of 18:2n-6 (0.5% of diet by dry weight) and 0.5, 0.7 and 1.1% of 18:3n-3, respectively. Increased dietary 18:3n-3 caused commensurate increases in longer-chain n-3 PUFA and decreases in longer-chain n-6 PUFA in the muscle lipids of tilapia. However, the biosynthetic activities of fish fed the LO-based diets were not sufficient to raise the tissue concentrations of 20:5n-3, 22:5n-3 and 22:6n-3 to those of fish fed FO. The study suggests that tilapia (O. niloticus) has a limited capacity to synthesise 20:5n-3 and 22:6n-3 from dietary 18:3n-3. The replacement of FO in the diet of farmed tilapia with vegetable oils could therefore lower tissue concentrations of 20:5n-3 and 22:6n-3, and consequently produce an aquaculture product of lower lipid nutritional value for the consumer.

Authors+Show Affiliations

Institute of Aquaculture, University of Stirling, Stirling, FK9 4LA, Scotland.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17473942

Citation

Karapanagiotidis, Ioannis T., et al. "Replacement of Dietary Fish Oils By Alpha-linolenic Acid-rich Oils Lowers Omega 3 Content in Tilapia Flesh." Lipids, vol. 42, no. 6, 2007, pp. 547-59.
Karapanagiotidis IT, Bell MV, Little DC, et al. Replacement of dietary fish oils by alpha-linolenic acid-rich oils lowers omega 3 content in tilapia flesh. Lipids. 2007;42(6):547-59.
Karapanagiotidis, I. T., Bell, M. V., Little, D. C., & Yakupitiyage, A. (2007). Replacement of dietary fish oils by alpha-linolenic acid-rich oils lowers omega 3 content in tilapia flesh. Lipids, 42(6), 547-59.
Karapanagiotidis IT, et al. Replacement of Dietary Fish Oils By Alpha-linolenic Acid-rich Oils Lowers Omega 3 Content in Tilapia Flesh. Lipids. 2007;42(6):547-59. PubMed PMID: 17473942.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Replacement of dietary fish oils by alpha-linolenic acid-rich oils lowers omega 3 content in tilapia flesh. AU - Karapanagiotidis,Ioannis T, AU - Bell,Michael V, AU - Little,David C, AU - Yakupitiyage,Amararatne, Y1 - 2007/05/01/ PY - 2006/11/17/received PY - 2007/03/20/accepted PY - 2007/5/3/pubmed PY - 2007/12/8/medline PY - 2007/5/3/entrez SP - 547 EP - 59 JF - Lipids JO - Lipids VL - 42 IS - 6 N2 - A 20-week feeding trial was conducted to determine whether increasing linolenic acid (18:3n-3) in vegetable oil (VO) based diets would lead to increased tissue deposition of 22:6n-3 in Nile tilapia (Oreochromis niloticus). Five isonitrogenous and isoenergetic diets were supplemented with 3% of either linseed oil (LO), a mixture of linseed oil with refined palm olein oil (PO) (LO-PO 2:1) and a mixture of refined palm olein oil with linseed oil (PO-LO 3:2) or with fish oil (FO) or corn oil (CO) as controls. The PO-LO, LO-PO and LO diets supplied a similar amount of 18:2n-6 (0.5% of diet by dry weight) and 0.5, 0.7 and 1.1% of 18:3n-3, respectively. Increased dietary 18:3n-3 caused commensurate increases in longer-chain n-3 PUFA and decreases in longer-chain n-6 PUFA in the muscle lipids of tilapia. However, the biosynthetic activities of fish fed the LO-based diets were not sufficient to raise the tissue concentrations of 20:5n-3, 22:5n-3 and 22:6n-3 to those of fish fed FO. The study suggests that tilapia (O. niloticus) has a limited capacity to synthesise 20:5n-3 and 22:6n-3 from dietary 18:3n-3. The replacement of FO in the diet of farmed tilapia with vegetable oils could therefore lower tissue concentrations of 20:5n-3 and 22:6n-3, and consequently produce an aquaculture product of lower lipid nutritional value for the consumer. SN - 0024-4201 UR - https://www.unboundmedicine.com/medline/citation/17473942/Replacement_of_dietary_fish_oils_by_alpha_linolenic_acid_rich_oils_lowers_omega_3_content_in_tilapia_flesh_ L2 - https://link.springer.com/article/10.1007/s11745-007-3057-1 DB - PRIME DP - Unbound Medicine ER -