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Zoological Research
Kunming Institute of Zoology, Chinese Academy of Sciences
ISSN: 2095-8137
Vol. 25, No. 3, 2004, pp. 249-255
Bioline Code: zr04044
Full paper language: Chinese
Document type: Research Article
Document available free of charge

Zoological Research, Vol. 25, No. 3, 2004, pp. 249-255

 en Effects of n-3 HUFA Content in Broodstock Diets on Reproductive Performance and Seasonal Changes of Plasma Sex Steroids Levels in Plectorhynchus cinctus check for this species in other resources
LI Yuan-you CHEN Wei-zhou SUN Ze-wei CHEN Jie-hui WU Ke-gang

 
 cn
LI Yuan-you CHEN Wei-zhou SUN Ze-wei CHEN Jie-hui WU Ke-gang


In order to study the effects of n-3 highly unsaturated fatty acids (n-3 HUFA) content in broodstock diets on the reproductive performance and seasonal changes of plasma sex steroids levels,five groups of Plectorhynchus cinctus check for this species in other resources female broodstocks were respectively fed a natural diet composed of trash fish (D5) and four artificial formulated diets containing 0.16% (D1),1.27% (D2),2.36% (D3) and 3.47% (D4) of n-3 HUFA,during the whole reproductive cycle.Their fecundity,egg and larval quality were evaluated,and the levels of plasma sex steroids were monthly monitored.It was found that the eggs production/kg of female,fertilization rate of eggs,larval survival and length at mouth-opening stage of both D2 and D3 group were equivalent to those of D5 group;however,those of D1 and D4 group were significantly lower than D5 group.Dietary n-3 HUFA content showed no obvious influence on the seasonal change pattern of plasma 172) and testosterone (T).However,the plasma E2 and T levels in gonad developmental and mature seasons of D1 and D4 group were significantly lower than those of D5 group.Dietary n-3 HUFA content also displayed some influence on E2 and T production by in vitro ovarian follicles.Little basic E2 production was observed by ovarian follicles of D4 group.Human chorionic gonadotropin (HCG,100 IU/mL) stimulated E2 and T production by ovarian follicles of D2-D5 group;however,ovarian follicles of D1 group had no response to HCG.The results suggest that the optimum n-3 HUFA requirements in broodstock diet of P.cinctus range between 1.27% and 2.36%,deficient or high dietary n-3 HUFA content may have negative effect on reproductive performance of broodstocks;n-3 HUFA may affect the reproductive performance by influencing the production of sex steroids.


Plectorhynchus cinctus; n-3 highly unsaturated fatty acid (n-3 HUFA); Fecundity; Sex steroid

 
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