Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/23843
Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Effect of ration level and dietary docosahexaenoic acid content on the requirements for long-chain polyunsaturated fatty acids by juvenile barramundi (Lates calcarifer)
Authors: Morton, Katherine M
Blyth, David
Bourne, Nicholas
Irvin, Simon
Glencross, Brett
Contact Email: b.d.glencross@stir.ac.uk
Keywords: Asian seabass
Docosahexaenoic acid (DHA)
Eicosapentaenoic acid (EPA)
Essential fatty acid (EFA)
Long-chain polyunsaturated fatty acid (LC-PUFA)
Issue Date: 20-Sep-2014
Publisher: Elsevier
Citation: Morton KM, Blyth D, Bourne N, Irvin S & Glencross B (2014) Effect of ration level and dietary docosahexaenoic acid content on the requirements for long-chain polyunsaturated fatty acids by juvenile barramundi (Lates calcarifer), Aquaculture, 433, pp. 164-172.
Abstract: Juvenile barramundi were fed one of six diets containing differing docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) levels. Fish were restricted fed on a pair-fed feeding regime to eliminate variability in feed intake, with two diets fed to satiety to examine the effects of fixed or variable feed rations on EFA requirements. Weight gain, feed intake, feed utilisation, and physical clinical signs were monitored. No effect of dietary DHA and EPA concentration, DHA:EPA ratio or total LC-PUFA level was observed on weight gain, growth rate, feed conversion ratio (FCR), survival or physical clinical health signs (P>0.05). Satiety fed fish had higher feed intake, final weight, weight gain and growth rate compared to their respective restrictively fed treatments (P<0.05). No effect of ration level on the responses to DHA concentration was observed. Body fatty acid composition was affected by diet, increasing dietary DHA resulted in higher body tissue DHA concentration, and a similar relationship was observed for EPA. Plasma haemoglobin increased with increasing DHA+EPA levels (P<0.05) while glutamate dehydrogenase increased for fish fed DHA+EPA in a 1:1 ratio, regardless of total dietary LC-PUFA (P<0.05). Juvenile barramundi may be fed diets containing as low as 1gkg-1 DHA without compromising growth or health status. 
Type: Journal Article
URI: http://hdl.handle.net/1893/23843
DOI Link: http://dx.doi.org/10.1016/j.aquaculture.2014.05.047
Rights: Accepted refereed manuscript of: Morton KM, Blyth D, Bourne N, Irvin S & Glencross B (2014) Effect of ration level and dietary docosahexaenoic acid content on the requirements for long-chain polyunsaturated fatty acids by juvenile barramundi (Lates calcarifer), Aquaculture, 433, pp. 164-172. DOI: 10.1016/j.aquaculture.2014.05.047 © 2014, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Affiliation: Commonwealth Scientific and Industrial Research Organisation (CSIRO)
Commonwealth Scientific and Industrial Research Organisation (CSIRO)
Commonwealth Scientific and Industrial Research Organisation (CSIRO)
Commonwealth Scientific and Industrial Research Organisation (CSIRO)
Aquaculture

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