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Estrogen synthesis in relation to estrone, estradiol, and vitellogenin plasma levels during the reproductive cycle of the female rainbow trout, Salmo gairdneri



Estrogen synthesis in relation to estrone, estradiol, and vitellogenin plasma levels during the reproductive cycle of the female rainbow trout, Salmo gairdneri



General and Comparative Endocrinology 45(1): 105-114



The annual reproductive cycle of the female rainbow trout, S. gairdneri, can be divided into 4 physiological periods: a previtellogenic period (March-April), a period of endogenous vitellogenesis (May-June), a period of exogenous vitellogenesis (Aug.-Dec.) and a period of ovulation and spawning (Jan.-Feb.). The estrogen synthetic capacity of the ovaries of adult trout was determined in vitro by incubation of ovarian homogenates with [3H]androstenedione during 6 mo. of the annual cycle. The estrogen synthetic capacity (the synthesis of estrone and estradiol-17.beta.) of the ovaries increased from zero in Feb. to a maximal value of 2.60 nmol/ovary in Oct. and rapidly decreased again in the following months. Plasma estrone and estradiol-17.beta. were determined monthly throughout the annual reproductive cycle by radioimmunoassay. Estrone plasma levels increased from 2.8 ng/ml in June to 5.1 ng/ml in Aug. Following a decrease to 2.8 ng/ml in Sept., a rapid increase to 30.2 ng/ml was seen in Nov. The values decreased again during the following months. Estradiol plasma levels increased from 1.0 ng/ml in April to 6.7 ng/ml in July. Following a decrease to 2.7 ng/ml in Aug. and 1.8 ng/ml in Sept., a sudden surge was seen to 59.8 ng/ml in Oct. The values decreased again during the following months. Vitellogenin levels measured in the same animals displayed a correlation with estrone levels in Oct. and Nov. and with estradiol values in Oct., Nov. and Dec. A possible physiological participation of estrone and estradiol during exogenous vitellogenesis is discussed.

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Accession: 005390412

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PMID: 7286624

DOI: 10.1016/0016-6480(81)90175-1


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