T. BAGHERI, A. A. HEDAYATI, A. JAFERIAN, M. A. HESNI and A. MOVAHEDINIA
Department of Marine Biology, University of Marine Science & Technology, Khorramshahr, Iran
BAGHERI, Tahere, Ali Akbar HEDAYATI, Amir JAFERIAN, Majid Askari HESNI and Abolali MOVAHEDINIA, 2008. The Study of Seasonal Fluctuation of Steroid Hormones in Great Sturgeon (Huso huso) Cultured in Brackish Water Condition Bulg. J. Agric. Sci., 14: 432-435
An experiment was conducted on blood sexual hormone measurement of Great sturgeon, aged 4-5 years, cultured in brackish water in Bafgh-Iran constructions. Hormone levels were measured with Radio Immunoassay (RIA). Gonadic sampling was stained with Hematoxylin & Eosin. Statistical results show significant elevation of sexual hormones in both sexes (p>0.05; more in male). However, only estradiol had significant elevation among seasons (maximum in fall and minimum in winter). Testosterone (T) had significant elevation in relation to gonadic development, but in females, estradiol (E2) and progesterone (P) had not significant elevation. In males, II, II-III, III, IV stages, T level was 5.5, 4.4, 6.3, 2.6 ng/m respectively l. In females, II, II-III stage, T was 0.1, 0.16, E2 was 1.455, 0.81 and P was 0.12, 0.13 ng/ml respectively. We concluded that in females, with parallel to progression of gonadic development, T and P have increased but E2 have decreased. Results were in accordance to the other works about reduction of sexual hormones in early life stages. What’s more, we could acclaim that seasons, environmental conditions and gonad development affect sexual hormones levels.