ISSN:
1573-143X
Keywords:
condition index
;
diatom (Skeletonema costatum)
;
European oyster (Crassostrea gigas)
;
fatty acid
;
glycogen
;
lipid
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Abstract To improve the condition index of European oysters (Crassostrea gigas), Skeletonema costatum was fed to adult oysters. However, the consequences of this practice on compositional traits of oysters were not investigated. This study deals with the chemical changes in oysters fed with Skeletonema costatum for six weeks in ponds. The results showed that: 1. Supplying Skeletonema costatum to oysters for six weeks improved the condition index (from 26 to 56) as a consequence of an increase in glycogen content (from 5.0 to 24.4 g·100 g −1 of dry flesh) while lipid content remained steady (9.9 g·100 g−1 dry flesh). 2. Large changes in fatty acid composition of neutral lipids were observed. Some fatty acids of Skeletonema costatum such as 16:1 ω7 and 20:5 ω3, were directly accumulated into lipid fractions. 3. 16:1 ω7 was elongated into 18:1 ω7 showing that oysters are able to elongate 16 carbon mono-unsaturated fatty acids into the corresponding 18 carbon fatty acids. 4. Fatty acids typical of Skeletonema costatum (16:4 ω1, 16:2 ω4, 16:3 ω4) were poorly accumulated into neutral lipids and phospholipids of oysters suggesting that oysters discriminate these fatty acids.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1009244530383
