scholarly journals Changes of gonadosomatic index and plasma levels of cortisol in the male and female captive Caspian brown trout,Salmo Trutta Caspius(Kessler, 1877) during the reproductive cycle

2013 ◽  
Vol 41 (2) ◽  
pp. 133-136 ◽  
Author(s):  
Hamid Reza Jamalzadeh ◽  
Maryam Akhundian ◽  
Milad Kabir ◽  
Hossein Khara ◽  
Elham Mirrasuli ◽  
...  
Keyword(s):  
Reproductive Cycle ◽  
Brown Trout ◽  
Plasma Levels ◽  
Salmo Trutta ◽  
Gonadosomatic Index ◽  
Male And Female ◽  
Caspian Brown Trout ◽  
Brown Trout Salmo Trutta ◽  
Salmo Trutta Caspius

Identification of follicular vitellogenesis stage by monitoring of plasma calcium and estradiol-17β concentrations in the cultured Caspian brown trout, Salmo trutta caspius Kessler, 1877

Biologia ◽  
2012 ◽  
Vol 67 (4) ◽  
Author(s):  
Hamid Jamalzadeh ◽  
Saeed Hajirezaee ◽  
Samane Nazeri ◽  
Hossein Khara ◽  
Elham Mirrasuli
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Positive Relationship ◽  
Plasma Calcium ◽  
Caspian Brown Trout ◽  
Clear Peak ◽  
Brown Trout Salmo Trutta ◽  
Estradiol 17Β ◽  
Simple Indicator ◽  
Salmo Trutta Caspius

AbstractTo identify a simple indicator for detection of follicular vitellogenesis stage of cultured Caspian brown trout, the changes of plasma calcium and estradiol-17β along with ovarian histology were investigated over a reproductive cycle. For this purpose, the blood and gonad samples were taken monthly over a six months period. According to results, the concentrations of plasma calcium increased significantly during October and November but then declined steadily until the end of experiment. Estradiol-17β concentrations were low throughout the experiment, a clear peak was observed in October. Histological observations showed that all examined females were in vitellogenesis when the peak of plasma calcium and estradiol-17β were observed. Also, significant positive relationship was found between plasma calcium and estradiol. The good fitness of plasma calcium and estradiol-17β peak with histological observations suggests that plasma calcium could be a good and simple indicator for detection of follicular vitellogenesis stage in the cultured Caspian brown trout.

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