Document Detail

Different ratios of docosahexaenoic and eicosapentaenoic acids do not alter growth, nucleic acid and fatty acids of juvenile cobia (Rachycentron canadum).
MedLine Citation:
PMID:  19760445     Owner:  NLM     Status:  MEDLINE    
An experiment was performed to study the effect of different ratios of docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) on the growth, nucleic acid and fatty acids of cobia (Rachycentron canadum) juveniles. The juveniles were fed for 8 weeks using seven treatment diets (D-1-D-7) with the same amount of DHA and EPA (1.50 +/- 0.1% of dried diet), but varying ratios of DHA to EPA (0.90, 1.10, 1.30, 1.50, 1.70, 1.90, 2.10, respectively) and a control diet (D-0, DHA + EPA = 0.8% of dried diet, DHA/EPA = 1.30). At the end of the experiment, the mean body weight (BW) of juveniles fed D-0-D-7 increased significantly (from 6.86 +/- 1.64 in the week 0 to 58.52 +/- 16.45 g at the end of week 8, P < 0.05). The mean RNA amount and RNA/DNA ratio in the muscle (from 39.62 +/- 1.30 microg mg(-1) and 2.29 +/- 0.11 in the week 0 to 272.55 +/- 10.70 microg mg(-1) and 14.54 +/- 1.75 at the end of week 8, respectively) and the mean weight in the liver (from 117.70 +/- 11.15 microg mg(-1) and 3.14 +/- 0.25 in the week 0 to 793.07 +/- 13.38 microg mg(-1) and 13.16 +/- 0.76 at the end of week 8, respectively) of cobia juveniles fed D-0-D-7 were significantly higher at the end of 8-week experiment than initially (P < 0.05). The RNA/DNA ratio in the muscle and liver of cobia juveniles increased with their growth and appeared an obvious positive relationship, especially in the muscle, based on regression analysis. The mean lipid content increased significantly in the liver (from 29.82 +/- 0.99 to 37.47 +/- 3.25% totally) and muscle (from 6.74 +/- 0.25 to 10.63 +/- 0.23% totally) of cobia juveniles (P < 0.05). However, no significant difference was found on the lipid contents of juveniles fed different diets for 8 weeks (P > 0.05). In the muscle and liver of juveniles, EPA decreased with its reduction in the diet; DHA, DHA/EPA ratio and poly unsaturated fatty acids (PUFAs) generally increased with their increment in the diet. The conclusion was drawn that the growth, nucleic acid and fatty acids of cobia juveniles were not significantly affected by different DHA/EPA ratios in our experiments.
Youqing Xu; Zhaokun Ding; Haizhu Zhang; Liang Liu; Shuqi Wang; John Gorge
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-09-17
Journal Detail:
Title:  Lipids     Volume:  44     ISSN:  1558-9307     ISO Abbreviation:  Lipids     Publication Date:  2009 Dec 
Date Detail:
Created Date:  2010-01-21     Completed Date:  2010-04-02     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0060450     Medline TA:  Lipids     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  1091-104     Citation Subset:  IM    
Institute for Fisheries Sciences, Guangxi University, 100 University Road, 530004 Nanning, Guangxi, China.
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MeSH Terms
Diet / veterinary*
Docosahexaenoic Acids / pharmacology*
Eicosapentaenoic Acid / pharmacology*
Liver / drug effects*,  metabolism
Muscles / drug effects*,  metabolism
Nucleic Acids / metabolism
Perciformes / growth & development*
Reference Standards
Reg. No./Substance:
0/Nucleic Acids; 1553-41-9/Eicosapentaenoic Acid; 25167-62-8/Docosahexaenoic Acids

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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