Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2014, Vol. 30 ›› Issue (20): 26-29.doi: 10.11924/j.issn.1000-6850.2013-1044

Special Issue: 生物技术 水产渔业

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Effects of Ration Levels on Growth, Digestive Enzyme, Immune Enzymes Activities and Nitrogen Budget of Litopenaeus vannamei

  

  • Received:2013-04-11 Revised:2014-05-18 Online:2014-07-15 Published:2014-07-15

Abstract: In order to study the effect of ration level on Shrimp, ration levels on growth characteristics, digestive enzymes, immune enzyme and nitrogen balance of Litopenaeus vannamei was studied. The results indicated that ration level significantly affected the survival rate, weight increasing rate, feed coefficient, growth rate, the nitrogen balance, part of digestive enzymes and immune enzymes activity. Weight increasing rate and specific growth rate were highest in 7% of ration level, survival rate was lowest in 9% of ration level, feed coefficient was lowest in 2% of ration level. A curves relationship existed between ration level and specific growth rate, and specific growth rate was highest in 7.92% of ration level. Feeding nitrogen, growth nitrogen, excretion nitrogen and fecal nitrogen were lowest in 2% of ration level and highest in 7% of ration level significantly. Low ration levels got low digestive enzymes and immune enzymes activity. Therefore, the optimal ration level should be 7%-8%.