Effects of different dietary levels of L-Arginine on growth indices and survival rate in fingerling common carp (Cyprinus carpio)

Arginine is one of the amino acids that its impact on improving the growth and immune system of human and many animals always been one of interest of researchers. In this study, the effect of this amino acid on growth indices and resistance against salinity tension on common carp fish has been investigated. For this purpose, four treatments (each treatment with three replicates) were made from common carp and fed with dietary foods containing arginine 0, 1.5, 2 and 2.5% for 60 days. During this period, the fishes three times were biometrics. Data analysis was performed using SPSS software version 18 and Excel and the comparing the mean of treatments in a completely randomized design have been performed analysis with Duncan test and one way ANOVA and existent or lack significant difference were performed in 5% of the level Probability (P<0.05). Regarding to the results obtain from arginine acid on food conversion rate (FCR), body weight gain and percentage of body weight gain of carp, it had significant impact (P <0.05), however, increasing body weight gain and decreasing FCR were observed in treatment groups (P<0.05), however condition factor (CF), growth specific rate (SGR) and survival rate (SR), did not showed any significant difference (P>0.05). Therefore, according to the present results, applying of salinity stress on different treatments showed that the presence of arginine in the feed of carp fish may have a significant effect on their resistance and survival, so that for feed treatments with 1.5% and 2% of arginine within 72 hours did not show any casualties, therefore. Hence, according to the present results, use of 2% L-Arginine to increase weight of carp, recommended.