EGGEXTRACTION OFSTERLETSTURGEON, ACIPENSER RUTHENUS L., THROUGH SURGERY

Nowadays, methods are used to assure that fish will be alive after obtaining eggs in sturgeon brood stocks. This study examines the extraction of eggs from Sterlet (Acipenser ruthenus) females and their survival after the extraction which was made through a small surgery. In this study, after sexing and maturity staging, 3 of 16 fish which were in maturity stage IV and were injected with pituitary extract after sexing and maturity staging and after ovulation. Ripe oocytes were collected through a 2.5 cm abdominal incision. Then, the wounds were closed with two simple sutures and disinfected. Individual reproduction indices on each fish were recorded. Results of this study showed that most of the ripe oocytes were collected easily and in a short time by using this method, and no mortality occurred from surgical manipulation or secondary infections. After 30 days, wounds had thoroughly improved. This study shows that using surgery in small-sized Sturgeon, less than one kilogram, is easy and possible. To protect the brood fish in culture conditions, this method would be advisable.