Efficiency of Streptococcus agalactiae Vaccine in Nile Tilapia (Oreochromis niloticus) with Different Stocking Density

Abstract

Study on efficiency of Streptococcus agalatiae vaccine in Nile Tilapia (Oreochromis niloticus) with different stocking density. Fish (average 64.37±0.95 g in weigh) were used in this studied were intraperitoneally injected. Fish were reared in 30, 50, 70 and 100 fish/meter2. The first antibody titers of above stocking densitywere 3.271±0.017, 2.837±0.198, 2.590±0.144 and 2.430±0.175, respectively. Moreover, the second antibody titer were 3.261±0.017, 3.100±0.053, 2.940±0.046 and 2.809±0.063, respectively. The growth rates were highest in stocking density of 50 fish/meter2 and lowest in 100 fish/meter2.