Comparative effects of Aquavac and Iranian streptococcus/lactococcus vaccine on Health Factors in rainbow trout (Onchorhynchus mykiss)

Streptococcosis / Lactococcosis is important diseases for the aquaculture industry special in rainbow trout (Oncorhynchus mykis). The aim of this study was to compare the effective of Streptococcosis divalent foreign and Iranian vaccines (Lactococus garvie and Streptococcus iniae) in the immune responses contains, complement activation, serum lysozyme rate, bactericidal and respiratory burst (NBT) and some hematological indices contains, RBC and WBC count and hematocrit and as well as the growth performance contains, initial weight, final weight, body weight gain percent, specific growth rate, feed conversion ratio, protein efficiency rate, body weight gain percent and condition factor in rainbow trout. In this study, 630 rainbow trout fish weighing about 26 ± 3g were divided to three treatments contains, foreign vaccine, iranian vaccines and control group. During the experimental period and on days 0, 14, 30, 45 and 60 after vaccination samples were taken. The results of this study showed an increase in measured indices of blood and immune responses From 14 to 60 days of experiment in vaccinated trout fish compared to the control group that the amount of foreign vaccine group increased than two other groups. Also the results of this study showed that Iranian vaccine had a better effect on growth performance of rainbow trout Compared to foreign vaccine and control groups. According to the results of this study, vaccination by foreign and Iranian vaccine could have a positive effect on fish health indicators.