Effects of dietary oil source on growth and fillet fatty Acid composition of Murray cod, Maccullochella peelii peelii

Francis, David, Turchini, Giovanni, Jones, Paul and De Silva, Sena 2006, Effects of dietary oil source on growth and fillet fatty Acid composition of Murray cod, Maccullochella peelii peelii, Aquaculture, vol. 253, no. 1-4, pp. 547-556.

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Title Effects of dietary oil source on growth and fillet fatty Acid composition of Murray cod, Maccullochella peelii peelii
Formatted title Effects of dietary oil source on growth and fillet fatty Acid composition of Murray cod, Maccullochella peelii peelii
Author(s) Francis, David
Turchini, Giovanni
Jones, Paul
De Silva, Sena
Journal name Aquaculture
Volume number 253
Issue number 1-4
Start page 547
End page 556
Publisher Elsevier B.V.
Place of publication Amsterdam, The Netherlands
Publication date 2006-03-31
ISSN 0044-8486
1873-5622
Keyword(s) Murray cod
canola oil
linseed oil
fatty acids
fish oil replacement
Summary The Murray cod, an Australian native freshwater fish, supports a relatively small but increasing aquaculture industry in Australia. Presently, there are no dedicated commercial diets available for Murray cod; instead, nutritionally sub-standard feeds formulated for other species are commonly used. The aim of the present investigation was to assess the suitability of two plant based lipid sources, canola oil (CO) and linseed oil (LO), as alternatives to fish oil for juvenile Murray cod. Five iso-nitrogenous, iso-calorific, iso-lipidic semi-purified experimental diets were formulated with 17% lipid originating from 100% cod liver oil (FO), 100% canola oil, 100% linseed oil and 1 : 1 blends of canola and cod liver oil (CFO) and 1 : 1 blends of linseed and cod liver oil (LFO). Each of the diets was fed to apparent satiation twice daily to triplicate groups of 50 Murray cod with initial mean weights of 6.45 ± 1.59 g for 84 days at 22 °C. Final mean weight, specific growth rate and daily feed consumption were significantly higher for the FO and LFO treatments compared to the LO treatment. Feed conversion and protein efficiency ratios were not significantly different amongst treatments. Experimental diets containing vegetable oil and vegetable oil blend(s) had significantly higher concentrations of n-6 fatty acids, predominantly in the form of linoleic acid (LA), while n-3 fatty acids were present in significantly higher concentrations in LO and LFO treatments. The fatty acid composition of Murray cod fillet was reflective of the dietary lipid source. Fillet of fish fed the FO was highest in EPA (20:5n-3), ArA (20:4n-6) and DHA (22:6n-3). Fish fed the CO diet had high concentrations of oleic acid (OlA) (192.2 ± 10.5 mg g lipid− 1), while the fillet of Murray cod fed the LO diet was high in α-linolenic acid (LnA) (107.1 ± 6.7 mg g lipid− 1). The present study suggests that fish oil can be replaced by up to 100% with canola oil and by up to 50% with linseed oil in Murray cod diets with no significant effect on growth.
Language eng
Field of Research 070401 Aquaculture
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2005, Elsevier B.V.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30003535

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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