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Effects of replacing fish oil with vegetable oils in feed for rainbow trout (Oncorhynchus mykiss) and Arctic charr (Salvelinus alpinus)

Pettersson, Andreas (2010). Effects of replacing fish oil with vegetable oils in feed for rainbow trout (Oncorhynchus mykiss) and Arctic charr (Salvelinus alpinus). Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2010:43
ISBN 978-91-576-7456-2
[Doctoral thesis]

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As global capture of fish has stagnated and fish consumption is increasing due to a growing human population, the demand can only be met by increased aquaculture production. Fish oil (FO), derived exclusively from wild pelagic fish, has traditionally been used as the primary lipid source in fish feeds. For a number of reasons, more sustainable development of aquaculture is necessary where FO needs to be replaced with a more sustainable lipid source. This thesis investigated the effects of FO replacement with two vegetable oils on growth, lipid content, feed preference and swimming performance of two salmonid species; rainbow trout and Arctic charr. In addition, a comparison of lipid content and composition with wild fish was performed to highlight the importance of natural food webs for successful production of specific fish species. The results obtained showed no negative effects on growth of fish fed vegetable oils. However, significant changes in fatty acid profiles were observed in fish tissues, with reduced levels of long-chain polyunsaturated fatty acids (LCPUFA), mainly EPA and DHA, and increased levels of 18:1n-9 and 18:2n-6. Comparisons of fatty acid profiles of wild and farmed Arctic charr showed significant differences in individual n-3 and n-6 fatty acids. The largest difference was found in arachidonic acid (20:4n-6) content with 7-fold higher levels in the phospholipid fraction in white muscle of wild Arctic charr compared with Arctic charr fed marine FO. Cholesterol-lowering effects were observed in fish fed rapeseed oil, possibly explained by the presence of phytosterols in the diet. Swimming performance at 4 ºC was significantly reduced in Arctic charr fed a blend of rapeseed oil and palm oil. This outcome is suggested to be an effect of the different levels of n-3 LCPUFA and saturated fatty acids due to their temperature influenced properties. The results in this thesis imply that an appropriate mix of vegetable oils and FO can replace the sole use of FO in fish feeds. However, researchers and feed manufacturers should be encouraged to continue to increase feed diversification in order to optimize the nutritional requirements of farmed fish.

Authors/Creators:Pettersson, Andreas
Title:Effects of replacing fish oil with vegetable oils in feed for rainbow trout (Oncorhynchus mykiss) and Arctic charr (Salvelinus alpinus)
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2010
Number of Pages:78
ALLI. Pettersson, A., Johnsson, L., Brännäs, E., Pickova, J.(2009). Effects of rapeseed oil replacement in fish feed on lipid composition and self selection by rainbow trout (Oncorhynchus mykiss). Aquaculture Nutrition 15, 577-586. II. Pettersson, A., Pickova, J., Brännäs, E. (2009). Effects of crude rapeseed oil on lipid composition in Arctic charr (Salvelinus alpinus). Journal of Fish Biology 75, 1446-1458. III. Pettersson, A., Pickova, J., Brännäs, E. (2010). Swimming performance at different temperatures and fatty acid composition of Arctic charr (Salvelinus alpinus) fed rapeseed and palm oils. Aquaculture 300, 176-181. IV. Pettersson, A., Pickova, J., Ask, P., Byström, P., Brännäs, E. (2010). Fatty acid profiles of wild and farmed Arctic charr (Salvelinus alpinus). Manuscript
Place of Publication:Uppsala
ISBN for printed version:978-91-576-7456-2
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:oncorhynchus mykiss, salvelinus alpinus, feeds, fish oils, rapeseed oil, palm oils, fish, lipid content, fatty acids, phytosterols, animal performance
Keywords:salmonids, fish oil, vegetable oil, n-3 LCPUFA, phospholipid, DHA, arachidonic acid, swimming performance, phytosterols.
Permanent URL:
ID Code:2284
Department:(NL, NJ) > Dept. of Food Science (until 161231)
Deposited By: Andreas Pettersson
Deposited On:05 May 2010 00:00
Metadata Last Modified:02 Dec 2014 10:17

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