Finishing diets stimulate compensatory growth: results of a study on Murray cod, Maccullochella peelii peelii

Turchini, Giovanni, Francis, David and De Silva, Sena 2007, Finishing diets stimulate compensatory growth: results of a study on Murray cod, Maccullochella peelii peelii, Aquaculture nutrition, vol. 13, no. 5, pp. 351-360.


Title Finishing diets stimulate compensatory growth: results of a study on Murray cod, Maccullochella peelii peelii
Author(s) Turchini, Giovanni
Francis, David
De Silva, Sena
Journal name Aquaculture nutrition
Volume number 13
Issue number 5
Start page 351
End page 360
Publisher Blackwell Publishing Ltd
Place of publication Oxford, England
Publication date 2007
ISSN 1353-5773
1365-2095
Keyword(s) fatty acids
fish oil replacement
lipo-compensatory growth
vegetable oil
wash-out
Summary The effective implementation of a finishing strategy (wash-out) following a grow-out phase on a vegetable oil-based diet requires a period of several weeks. However, fish performance during this final stage has received little attention. As such, in the present study the growth performance during both, the initial grow-out and the final wash-out phases, were evaluated in Murray cod (Maccullochella peelii peelii). Prior to finishing on a fish oil-based diet, fish were fed one of three diets that differed in the lipid source: fish oil, a low polyunsaturated fatty acid (PUFA) vegetable oil mix, and a high PUFA vegetable oil mix. At the end of the grow-out period the fatty acid composition of Murray cod fillets were reflective of the respective diets; whilst, during the finishing period, those differences decreased in degree and occurrence. The restoration of original fatty acid make up was more rapid in fish previously fed with the low PUFA vegetable oil diet. During the final wash-out period, fish previously fed the vegetable oil-based diets grew significantly (P < 0.05) faster (1.45 ± 0.03 and 1.43 ± 0.05, specific growth rate, % day−1) than fish continuously fed with the fish oil-based diet (1.24 ± 0.04). This study suggests that the depauperated levels of highly unsaturated fatty acids in fish previously fed vegetable oil-based diets can positively stimulate lipid metabolism and general fish metabolism, consequently promoting a growth enhancement in fish when reverted to a fish oil-based diet. This effect could be termed 'lipo-compensatory growth'.
Notes Published Online: 20 Aug 2007
Language eng
Field of Research 070401 Aquaculture
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2007, Blackwell Publishing Ltd
Persistent URL http://hdl.handle.net/10536/DRO/DU:30007079

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