Effects of dietary astaxanthin concentration and feeding period on the skin pigmentation of Australian snapper Pagrus auratus (Bloch & Schneider, 1801)

Doolan, Benjamin John, Booth, Mark A, Allan, Geoff and Jones, Paul 2008, Effects of dietary astaxanthin concentration and feeding period on the skin pigmentation of Australian snapper Pagrus auratus (Bloch & Schneider, 1801), Aquaculture research, vol. 40, no. 1, pp. 60-68.

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Title Effects of dietary astaxanthin concentration and feeding period on the skin pigmentation of Australian snapper Pagrus auratus (Bloch & Schneider, 1801)
Formatted title Effects of dietary astaxanthin concentration and feeding period on the skin pigmentation of Australian snapper Pagrus auratus (Bloch & Schneider, 1801)
Author(s) Doolan, Benjamin John
Booth, Mark A
Allan, Geoff
Jones, Paul
Journal name Aquaculture research
Volume number 40
Issue number 1
Start page 60
End page 68
Total pages 9
Publisher Wiley-Blackwell Publishing Ltd
Place of publication Oxford, England
Publication date 2008-12
ISSN 1355-557X
1365-2109
Keyword(s) astaxanthin
dose response
Pagrus auratus
skin colour
snapper
Summary A single-factor experiment was conducted to investigate the effects of dietary astaxanthin concentration on the skin colour of snapper. Snapper (mean weight=129 g) were held in white cages and fed one of seven dietary levels of unesterified astaxanthin (0, 13, 26, 39, 52, 65 or 78 mg astaxanthin kg−1) for 63 days. Treatments comprised four replicate cages, each containing five fish. The skin colour of all fish was quantified using the CIE L*, a*, b* colour scale after 21, 42 and 63 days. In addition, total carotenoid concentrations of the skin of two fish cage−1 were determined after 63 days. Supplementing diets with astaxanthin strongly affected redness (a*) and yellowness (b*) values of the skin at all sampling times. After 21 days, the a* values increased linearly as the dietary astaxanthin concentration was increased before a plateau was attained between 39 and 78 mg kg−1. The b* values similarly increased above basal levels in all astaxanthin diets. By 42 days, a* and b* values increased in magnitude while a plateau remained between 39 and 78 mg kg−1. After 63 days, there were no further increases in measured colour values, suggesting that maximum pigmentation was imparted in the skin of snapper fed diets >39 mg kg−1 after 42 days. Similarly, there were no differences in total carotenoid concentrations of the skin of snapper fed diets >39 mg kg−1 after 63 days. The plateaus that occurred in a* and b* values, while still increasing in magnitude between 21 and 42 days, indicate that the rate of astaxanthin deposition in snapper is limited and astaxanthin in diets containing >39 mg astaxanthin kg−1 is not efficiently utilized. Astaxanthin retention after 63 days was greatest from the 13 mg kg−1 diet; however, skin pigmentation was not adequate. An astaxanthin concentration of 39 mg kg−1 provided the second greatest retention in the skin while obtaining maximum pigmentation. To efficiently maximize skin pigmentation, snapper growers should commence feeding diets containing a minimum of 39 mg unesterified astaxanthin kg−1 at least 42 days before sale.
Language eng
Field of Research 070401 Aquaculture
Socio Economic Objective 830399 Livestock Raising not elsewhere classified
HERDC Research category C1 Refereed article in a scholarly journal
HERDC collection year 2009
Copyright notice ©2009, TheAuthors
Persistent URL http://hdl.handle.net/10536/DRO/DU:30022576

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