Fluctuations of sexual steroid hormones, calcium ion and alkalinephosphatase enzyme during different sexual maturation stages in broodstock of Silver Carp (Hypophthalmichthys molitrix L.)

Study of hormone profiles is one of the most important methods for detecting regulator mechanisms of reprodution process in fish. The present study was carried out with the aim of determining sexual steroid hormones, calcium ion and alkalinephosphatase enzyme (ALP) during different sexual maturation stages in silver carp (Hypophthalmichthys molitrix) during 6 months. A total of 24 fish (including 12 males and 12 females) at different sexual maturation stages (I - IV) were selected and blood samples were taken. Testosterone and progesterone levels showed significant difference both in males and females at different sexual maturation stages (P