Electrolytes and Sex steroids profiles of cultured Beluga (Huso huso)

Document Type : Biology(Animal)

Authors

1 Fishery Department, College of Agricultural and Natural Resources, Islamic Azad University, Azadshar branch. Azadshar, Iran

2 Sturgeon Propagation and Rearing Center of Shahid Marjani, P.O.Box: 49315-143, Gorgan, Iran

Abstract

In  this  study  electrolytes  and  sex  steroids  levels  of  beluga  (Huso  huso)  were  determined. Forty-one fish selected randomly from different age groups (4, 6, 7 and 8 year-old) including 23 females and 18 males in Shahid Marjani Sturgeon Culture  Center located in the Golestan Province (Gorgan, Iran). Blood sampling was taken from the caudal vein of fish. After serum separation, electrolytes (calcium, sodium and potasium) and sex steroids were determined. No significant  differences  were  seen  between  male  and  female  for  blood  serum  electrolytes. There  is  not  any  difference  in  electrolytes  fluctuation  of  Beluga  between  males  and  females when  evaluated  with  sex  maturation.  The  results  of  linear  regression  analysis  in  male  and female showed that with the increase in gonad maturation the level of calcium was increased. Testosterone and 17α-hydroxyprogestrone levels showed significant difference in males at the stage  V.  The  level  of  estradiol-17β  (E2)  in  males  showed  chaotic  fluctuations  in  different stages.  By  six  years,  all  males  could  be  separated  from  females  based  on  T  content  (>5 ng/ml).  In  females,  T,  E2  and  17-OHP  levels  were  relatively  low  before  vitellogenesis,  but during the vitellogenesis (stage IV) the level of T and E2 dramatically increased. The level of 17α-hydroxyprogestrone showed chaotic fluctuations in different stages. In conclusion, T, E2 and 17-OHP hormones are most important indices of sexual maturation. 

Keywords

Journal of Animal Environment
Volume 5, Issue 2
September 2012
Pages 79-86

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