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Serum levels of 11 oxotestosterone in male and 17 beta estradiol in female rainbow trout salmo gairdneri during the 1st reproductive cycle



Serum levels of 11 oxotestosterone in male and 17 beta estradiol in female rainbow trout salmo gairdneri during the 1st reproductive cycle



General & Comparative Endocrinology 56(1): 111-120



The serum levels of 11-oxotestosterone (11-O-T) in 231 male and of 17.beta.-estradiol (E2) in 207 female rainbow trout were measured radioimmunologically, and compared with the developmental stages of the gonads. Using histological criteria, testicular development was divided into 7 stages, and ovarian development into 4 stages. In males, 11-O-T levels remained < 6 ng/ml until the appearance of spermatozoa. Maximum values (126 ng/ml) were observed in spermiating males. In females, E2 levels were < 2 ng/ml during the period of flow oocyte growth. Maximum values (average of 31 ng/ml) were observed during exogenous vitellogenesis.

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Accession: 006402188

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