Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/7447
Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Replacement of dietary fish oils by alpha-linolenic acid-rich oils lowers omega 3 content in tilapia flesh
Authors: Karapanagiotidis, Ioannis T
Bell, Michael
Little, David Colin
Yakupitiyage, Amararatne
Contact Email: d.c.little@stir.ac.uk
Keywords: 3
activities
alpha-linolenic acid
AQUACULTURE
CAPACITY
Control
DESATURATION
diet
DIETARY
Diets
EICOSAPENTAENOIC ACID
ELONGATION
feeding
fish
fish oil
FISH-OIL
HYBRID TILAPIA
LINSEED
linseed oil
lipid
LIPIDS
MARINE LIPIDS
METABOLISM
molecular
MUSCLE
N-3
Nile tilapia
nutrition
OIL
Oreochromis niloticus
polyunsaturated fatty acids
POLYUNSATURATED FATTY-ACIDS
PRODUCT
PUFA
REPLACEMENT
TILAPIA
TISSUE
TRIAL
TROUT ONCORHYNCHUS-MYKISS
VALUE
vegetable oil
vegetable oils
VEGETABLE-OIL
VEGETABLE-OILS
WEIGHT
Issue Date: Jun-2007
Publisher: Springer
Citation: Karapanagiotidis IT, Bell M, Little DC & Yakupitiyage A (2007) Replacement of dietary fish oils by alpha-linolenic acid-rich oils lowers omega 3 content in tilapia flesh, Lipids, 42 (6), pp. 547-559.
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.
Type: Journal Article
URI: http://hdl.handle.net/1893/7447
DOI Link: http://dx.doi.org/10.1007/s11745-007-3057-1
Rights: The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.
Affiliation: University of Stirling
Aquaculture
Aquaculture
Asian Institute of Technology

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