Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/24468
Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Temperature increase negatively affects the fatty acid bioconversion capacity of rainbow trout (Oncorhynchus mykiss) fed a linseed oil-based diet
Authors: Mellery, Julie
Geay, Florian
Tocher, Douglas R
Kestemont, Patrick
Debier, Cathy
Rollin, Xavier
Larondelle, Yvan
Contact Email: drt1@stir.ac.uk
Keywords: Rainbow trout
Oncorhynchus mykiss
diet
nutrition
linolenic acid
18:3n-3
lipid metabolism
LC-PUFA biosynthesis
temperature.
Issue Date: 13-Oct-2016
Citation: Mellery J, Geay F, Tocher DR, Kestemont P, Debier C, Rollin X & Larondelle Y (2016) Temperature increase negatively affects the fatty acid bioconversion capacity of rainbow trout (Oncorhynchus mykiss) fed a linseed oil-based diet, PLoS ONE, 11 (10), Art. No.: e0164478.
Abstract: Aquaculture is meant to provide fish rich in omega-3 long chain polyunsaturated fatty acids (n-3 LC-PUFA). This objective must be reached despite (1) the necessity to replace the finite and limited fish oil in feed production and (2) the increased temperature of the supply water induced by the global warming. The objective of the present paper was to determine to what extent increased water temperature influences the fatty acid bioconversion capacity of rainbow trout (Oncorhynchus mykiss) fed a plant-derived diet. Fish were fed two diets formulated with fish oil (FO) or linseed oil (LO) as only added lipid source at the optimal water temperature of 15°C or at the increased water temperature of 19°C for 60 days. We observed that a temperature increase close to the upper limit of the species temperature tolerance range negatively affected the feed efficiency of rainbow trout fed LO despite a higher feed intake. The negative impact of increased water temperature on fatty acid bioconversion capacity appeared also to be quite clear considering the reduced expression offatty acid desaturase 2in liver and intestine and the reduced Δ6 desaturase enzymatic activity in intestinal microsomes. The present results also highlighted a negative impact of increased temperature on the apparentin vivoenzymatic activity of Δ5 and Δ6 desaturases of fish fed LO. Interestingly, this last parameter appeared less affected than those mentioned above. This study highlights that the increased temperature that rainbow trout may face due to global warming could reduce their fatty acid bioconversion capacity. The unavoidable replacement of finite fish oil by more sustainable, readily available and economically viable alternative lipid sources in aquaculture feeds should take this undeniable environmental issue on aquaculture productivity into account.
DOI Link: http://dx.doi.org/10.1371/journal.pone.0164478
Rights: © 2016 Mellery et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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