Biotechnic of artificial and semi-artificial Fingerling production of common carp (Cyprinus carpio Linnaeus, 1758) of Caspian Sea

*, This study carried out to determining the normative of artificial and semi-artificial reproduction of wild common carp (Cyprinus carpio. L. 1758) in 2019. In this study, 70 samples were caught from Gomishan region. Mean weight and length of 29 wild males were 1146±151.62 g and 44.79±2cm, and for 41 wild females were 1152.25±235.14 g and 44.87±2.4cm, respectively. Mean age of males were 7.16±0.75 and females were 9.5±0.67 years old, respectively. Artificial and semi-artificial propagation methods were performed. Artificial propagation was done by Ovulin injection in two steps for females at 1 ml / kg fish weight and half the dose was injected at the same time in the second stage of female infusion after 12 hours for males.14 males and 13 females broodstocks for artificial, and 7 and 10 for semi-artificial propagation were selected. The number of eggs per gram was 783±53. The fertilization rate was 91±4 and hatch rate was 58±7.23.Maximum and minimum relative fecundity were 209707 and 61200 per kilogram of body weight and Maximum and minimum working fecundity were 325728 and 53244 respectively. Mean relative and working fecundity was 104795.6±49663.32 and 128981.5±84102. Hatch rate was 58±7.23. A total of 729800 larvae were transferred to the Sijaval Center pond . 200000 juveniles with 0.8g weight and 36500 juveniles with 2.6g weight producing of semi artificial propagation rearing in Gharasu River in order to restocking. For reproduction of wild common carp, choosing the broodstocks in right time (in winter), region of catching, transfer it from the sea to breeding centers are the most important effective point. Therefore, the manipulation, relocation and transfer of these newly catch wildlife from the shores of the sea or river requires equipment, handy net, disinfect materials, anesthesia, Oxygen tank and time table.