Infl uence of two diff erent dietary zinc sources in freshwater prawn Macrobrachium rosenbergii post larvae

摘要

A feeding experiment was conducted to evaluate the eff ects 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 10μm)and Zn-NPs(size 50 nm)were supplemented separately with the basal feeds of M.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 diff erential haemocytes count)of M.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 of M.rosenbergii for regulating better survival and growth.