Program and Abstracts(PDF)
Program and Abstracts(PDF)
Program and Abstracts(PDF)
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Poster presentation 15<br />
EFFECTS OF POLYCHAETE EXTRACTS ON REPRODUCTIVE PERFORMANCE<br />
AND TISSUE LIPID COMPOSITIONS OF KURUMA SHIMP, MARSUPENAEUS<br />
JAPONICUS, BATE<br />
Binh Thanh Nguyen 1* , Shogo Harakawa 2 , Saichio Yokoyama 1,2 , Manabu Ishikawa 1,2 ,<br />
Shunsuke Koshio 1,2 , <strong>and</strong> Kazutaka Sakiyama 3<br />
1<br />
The United Graduate of Agricultural Sciences, Kagoshima University, Kagoshima,<br />
890-0065, Japan<br />
2 Laboratory of Aquatic Animal Nutrition, Faculty of Fisheries, Kagoshima University,<br />
Kagoshima, 890-0056, Japan<br />
3 Momoshima Station, National Research Institute of Fisheries <strong>and</strong> Environment of Inl<strong>and</strong><br />
Sea, Fisheries Research Agency, Onomichi, Hiroshima, 722-0061, Japan<br />
* Email: binh2912 at yahoo.com<br />
A series of 3 experiments were set up to examine effects of marine polychaete extracts on<br />
reproductive performance <strong>and</strong> body tissue lipids of Marsupenaeus japonicus. In experiment 1,<br />
three polychaete extracts including trichloroacetic- soluble, neutral <strong>and</strong> polar lipids as<br />
supplements (0.5% of DM) to a basal diet given to unilaterally ablated wild caught female M.<br />
japonicus. Effects of polychaete extracts on M. japonicus ovarian maturation were observed<br />
<strong>and</strong> compared. Polychaete neutral lipid (PNL) extract probably containing some steroid<br />
hormonal substances was the most effective on M. japonicus ovarian maturation <strong>and</strong> followed<br />
by TCA-soluble extract. In experiment 2, four levels of PNL extract (0, 0.2%, 0.4% <strong>and</strong><br />
0.8%) incorporated with a basal diet were given to female M. japonicus for a 15-day period.<br />
The results showed that the sufficient supplemental PNL extract level in maturation diet to<br />
give positive effects on ovarian maturity of M. japonicus is from 0.4%. In experiment 3, a<br />
combination of polychaete TCA-soluble <strong>and</strong> PNL extracts was tested as supplements to a<br />
basal diet with comparison to fresh polychaetes <strong>and</strong> non-feeding. Synergetic effects of<br />
combined polychaete extracts in maturation diet on reproductive performance of M. japonicus<br />
were observed as significant higher hatching percentage <strong>and</strong> number of nauplii per spawn.<br />
Polychaete extracts affected shrimp hepatopancreatic <strong>and</strong> ovarian lipid tissues through<br />
influences on sexual maturation process. Effects of polychaete extracts on total lipids, lipid<br />
class <strong>and</strong> fatty acid compositions of hepatopancreas <strong>and</strong> ovaries were discussed.<br />
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