Influence of two different dietary zinc sources in freshwater prawn Macrobrachium rosenbergii post larvae

摘要

A feeding experiment was conducted to evaluate the effects of bulk zinc (B-Zn) and zinc nanoparticles (Zn-NPs) on survival,growth,compositions of amino acid and fatty acid,and nonspecific immune responses of the freshwater prawn,Macrobrachium rosenbergii post larvae.The B-Zn (size 10 μm)and Zn-NPs (size 50 nm) were supplemented separately with the basal feeds ofM.rosenbergii at 60 mg/kg and feed without supplementation of any Zn source was served as a control.M.rosenbergii were fed these feeds for 90 days and the results showed that significant (P＜0.05) improvements in survival,growth,feed intake,specific growth rate,essential amino acids,unsaturated fatty acids,nonspecific immune responses (total haemocytes and differential haemocytes count) ofM.rosenbergii fed with B-Zn and Zn-NPs supplemented feeds when compared to control.Among these Zn sources,Zn-NPs supplemented feeds fed prawns showed significantly (P＜0.05) better performance than that of B-Zn and control.Hence,present study suggests that the 60 mg/kg Zn-NPs can be supplemented with basal feeds ofM.rosenbergii for regulating better survival and growth.