Please use this identifier to cite or link to this item:
Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Omega-3 long-chain polyunsaturated fatty acids and aquaculture in perspective (Forthcoming/Available Online)
Authors: Tocher, Douglas R
Contact Email:
Keywords: Fish oil
Essential fatty acids
Issue Date: 17-Jan-2015
Publisher: Elsevier
Citation: Tocher DR Omega-3 long-chain polyunsaturated fatty acids and aquaculture in perspective (Forthcoming/Available Online), Aquaculture.
Abstract: In the 40 years since the essentiality of polyunsaturated fatty acids (PUFA) in fish was first established by determining quantitative requirements for 18:3n−3 and 18:2n−6 in rainbow trout, essential fatty acid (EFA) research has gone through distinct phases. For 20 years the focus was primarily on determining qualitative and quantitative EFA requirements of fish species. Nutritional and biochemical studies showed major differences between fish species based on whether C18 PUFA or long-chain (LC)-PUFAwere required to satisfy requirements. In contrast, in the last 20 years, research emphasis shifted to determining “optimal” levels of EFA to support growth of fish fed diets with increased lipid content and where growth expectations were much higher. This required greater knowledge of the roles and functions of EFA inmetabolismand physiology, and howthese impacted on fish health and disease. Requirement studies were more focused on early life stages, in particular larval marine fish, defining not only levels, but also balances between different EFAs. Finally, a major driver in the last 10–15 years has been the unavoidable replacement of fish oil and fishmeal in feeds and the impacts that this can have on n−3 LC-PUFA contents of diets and farmed fish, and the human consumer. Thus, dietary n−3 infish feeds can be defined by three levels. Firstly, the minimumlevel required to satisfy EFA requirements and thus prevent nutritional pathologies. This level is relatively small and easy to supply even with today's current high demand for fish oil. The second level is that required to sustainmaximumgrowth and optimumhealth in fish being fed modern high-energy diets. The balance between different PUFA and LC-PUFA is important and defining them is more challenging, and so ideal levels and balances are still not well understood, particularly in relation to fish health. The third level is currently driving much research; how can we supply sufficient n−3 LC-PUFA tomaintain these nutrients in farmed fish at similar or higher levels than in wild fish? This level far exceeds the biological requirements of the fish itself and to satisfy it we require entirely new sources of n−3 LCPUFA. We cannot rely on the finite and limited marine resources that we can sustainably harvest or efficiently recycle. We need to produce n−3 LC-PUFA de novo and all possible options should be considered.
Type: Journal Article
DOI Link:
Rights: This item has been embargoed for a period. During the embargo 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: Aquaculture

Files in This Item:
File Description SizeFormat 
Tocher omega-3 review.pdf742.23 kBAdobe PDFUnder Embargo until 18/1/2017     Request a copy

Note: If any of the files in this item are currently embargoed, you can request a copy directly from the author by clicking the padlock icon above. However, this facility is dependant on the depositor still being contactable at their original email address.

This item is protected by original copyright

Items in the Repository are protected by copyright, with all rights reserved, unless otherwise indicated.

If you believe that any material held in STORRE infringes copyright, please contact providing details and we will remove the Work from public display in STORRE and investigate your claim.