Mahsa Ranjdoost - University of, Gonbade kavoos, Golestan province, Iran
h Jafaryan - University of, Gonbade kavoos, Golestan province, Iran
s Jafaryan - Gorgan University of Agricultural Sciences and Natural Resources, Golestan province, Iran

The blend of two probiotic bacilli, Bacillus circulans and B. licheniformis were inoculate into the rearing tanks of common carp on exploitation of three live food and feeding and growth efficiency. Artemia urmiana, Artemia fransiscana and Artemia parthenogenetica nauplii were fed by common carp larvae with initial body weight, 111011 mg for 12 daysat feeding rate of %13 of body weight. In treatments C-P, C.F and C-U the common carp larvae were fed with Artemia parthenogenetica, A. fransiscana and A. urmiana nauplii respectively and in probiotic treatments (C-P-B, C-F-B and C-U-B) the fish larvae werefed with these Artemia nauplii and two probiotic baceria (B. circulans and B. licheniformis) at a concentration of 1×116 CFU/liter were then inoculated to the rearingtanks. In the final of experiment the results indicated that the Within treatments, final body weight (FBW), Specific growth rate (SGR), thermal growth coefficient (TGC), daily growth coefficient (DGC), Relative gain rate (RGR) were affected by probioticbacillus (P<1010). The results indicated that the using probiotic in rearing tanks of Common Carp larvae significantly (p1010) promoted levels of dry matter in treatmentsof C-P-B and C-U-B in comparison with other treatments and highest dry matter (%1003) was obtained in treatment of G.P-Bacteria while in treatment of C-P and C-F were significantly (P < 1010) lower than other treatments. The minimum of dry matter (1.0.13)was observed in treatment of C-P. The maximum of crude lipid level (110.23) was obtained in treatment of C-P-B where the common carp larvae were fed with Artemia parthenogenetica. The inoculation of probiotic bacillus into the rearing system tanks of common carp larvae significantly increased (P < 1010) the crude energy of carcass common carp larvae in treatment of C-P-B where common carp larvae were feeding byArtemia parthenogenetica nauplii with inoculated bacilli in water of rearing system. Generally the best exploitation performance of common carp larvae was obtained by feeding of Artemia parthenogenetica nauplii in trial of probiotic (C-P-B).

common carp, probiotic bacilli, live food, Artemia, rearing tanks, crude lipid