Biochemical, sex steroids and hematological changes in pikeperch Sander lucioperca pre and post spawning

This study was conducted with the purpose of comparing the changes of sex steroids، hematological parameters and stress indices of pikeperch Sander lucioperca in final stage of reproduction. The blood samples were taken from 25 females and 9 males in order to determine stress indices، sex steroids and hematological parameters pre and post spawning of pikeperch. The testosterone in males and progesterone in females showed significant difference before and after spawning. While، estradiol in male and female brooders showed significant difference before spawning. In terms of stress indices (cortisol، lactate، glucose)، only glucose in males showed significant different before and after spawning. Regards the hematological parameters، the number of white blood cells (WBC) in females and the number of red blood cells (RBC) in males showed significant different before and after spawning. The obtained results showed that although many measured indices changed during pre and post spawning، main changes was observed in sex steroids levels. These changes in male and female as well as pre and post spawning are due to different physiological and hormonal during the final maturation and spawning.