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Weaning of Australian shortfin glass eels (Anguilla Australis): a comparison on the effectiveness of four types of fish roe

De Silva, Sena S., Gunasekera, Rasanthi M., Ingram, Brett A. and Dobson, Jennifer L. 2001, Weaning of Australian shortfin glass eels (Anguilla Australis): a comparison on the effectiveness of four types of fish roe, Aquaculture, vol. 195, no. 1-2, pp. 133-148, doi: 10.1016/S0044-8486(00)00548-2.

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Title Weaning of Australian shortfin glass eels (Anguilla Australis): a comparison on the effectiveness of four types of fish roe
Author(s) De Silva, Sena S.
Gunasekera, Rasanthi M.
Ingram, Brett A.
Dobson, Jennifer L.
Journal name Aquaculture
Volume number 195
Issue number 1-2
Start page 133
End page 148
Publisher Elsevier Science BV
Place of publication Amsterdam, Netherlands
Publication date 2001-04
ISSN 0044-8486
1873-5622
Keyword(s) Australian short-fin eel
fish roe
glass eel weaning;
fatty acids
amino acids
Summary Eel culture is solely dependent on wild seed stock, caught in estuaries during the freshwater migratory phase as glass eels. The methods used for weaning glass eels are very variable, and range from the use of live zooplankton to fish roe to fines of commercial fish feeds. The present experiments were conducted on glass eels of the Australian shortfin eel, when the effectiveness of four types of readily available fish roe (European carp, mirror dory, orange roughy and warehou) were evaluated over a 42-day period, in the laboratory.

After 28 days the eels did not show an interest in orange roughy and mirror dory roe, and these two treatments were discontinued to avoid mortality. In all treatments there was a decrease in mean weight during this period, but the survival was over 99%. In the 28th to 42nd day period the mean weight and specific growth rate of glass eels reared on European carp and warehou roe increased, but the differences between these two treatments were not significant.

The physical features of the roe and the oocytes thereof, the proximate composition, amino acid and fatty acid composition indicated major differences amongst the roe types, particularly with regard to the amount of n−6 polyunsaturated fatty acids (PUFA) and the ratio of n−3 to n−6. European carp and warehou roe (and oocytes) had a significantly higher arachidonic acid (AA-20:4n−6; over 60% of PUFA) content and a considerably lower n−3 to n−6 ratio (n−3 to n−6 ratio being 1.32, 5.92, 3.77 and 2.67 for roe types, and 1.25, 4.83, 2.91 and 2.42 for oocytes, of European carp, mirror dory, orange roughy and warehou, respectively), than in the other two roe types. The fatty acid profiles of European carp and warehou roe were similar to that of metamorphosing glass eels.
Notes Available online 20 February 2001.
Language eng
DOI 10.1016/S0044-8486(00)00548-2
Field of Research 070401 Aquaculture
Socio Economic Objective 970107 Expanding Knowledge in the Agricultural and Veterinary Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2001, Elsevier Science B.V.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30001345

Document type: Journal Article
Collection: School of Ecology and Environment
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