Journal ArticleDOI
Plasma 17α,20β-dihydroxy-4-pregnen-3-one levels during sexual maturation of amago salmon (Oncorhynchus rhodurus): Correlation with plasma gonadotropin and in vitro production by ovarian follicles
TLDR
It is indicated that 17 alpha, 20 beta-diOHprog is the major steroid responsible for oocyte maturation in amago salmon, produced as the follicular mediator of gonadotropin.About:
This article is published in General and Comparative Endocrinology.The article was published on 1983-07-01. It has received 162 citations till now. The article focuses on the topics: Gonadotropin & Ovulation.read more
Citations
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Journal ArticleDOI
Sex determination and sex differentiation in fish: an overview of genetic, physiological, and environmental influences
TL;DR: The lability of sex-determination systems in fish makes some species sensitive to environmental pollutants capable of mimicking or disrupting sex hormone actions, and such observations provide important insight into potential impacts from endocrine disruptors, and can provide useful monitoring tools for impacts on aquatic environments.
Journal ArticleDOI
Regulation of oocyte maturation in fish.
TL;DR: This article showed that oocyte maturation is a three-step induction process involving gonadotropin (LH), maturation-inducing hormone (MIH), and maturationpromoting factor (MPF).
Book ChapterDOI
6 The Functional Morphology of Teleost Gonads
TL;DR: This chapter discusses the functional morphology of teleost gonads and a two cell-type model involving thecal and granulosa cell layers has been proposed for the production of these two steroids for the first time in lower vertebrates.
Book ChapterDOI
Regulation of oocyte growth and maturation in fish
TL;DR: Of considerable interest is the finding that MIH, unlike most steroid hormones, acts on its receptors at the surface of oocytes, and the mechanism of MIH-induced MPF activation in fish oocytes differs from that in Xenopus and starfish.
Journal ArticleDOI
17α,20β-Dihydroxy-4-pregnen-3-one, a maturation-inducing hormone in fish oocytes: Mechanisms of synthesis and action
TL;DR: Findings suggest that 17 alpha,20 beta-DP initiates translation of cyclin B mRNA through cytoplasmic 3' poly(A) elongation.
References
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Journal ArticleDOI
In Vitro Oocyte Maturation and Ovulation in Rainbow Trout (Salmo gairdneri), Northern Pike (Esox lucius), and Goldfish (Carassius auratus)
TL;DR: The endocrine processes which control oocyte maturation and ovulation have been studied in vitro in the trout Salmo gairdneri and it is shown that 17α-hydroxy-20β-dihydroprogesterone plays a preferential role in initiating maturation.
Journal ArticleDOI
Estradiol-17β production in amago salmon (Oncorhynchus rhodurus) ovarian follicles: Role of the thecal and granulosa cells
TL;DR: A two-cell-type model for the production of follicular estrogens, the thecal layer possibly contributing to estradiol-17β production by synthesizing androgens which are transferred to the granulosa layer and aromatized to est radiol- 17β is suggested.
Journal ArticleDOI
Measurement of 17α,20β-dihydroxy-4-pregnen-3-one in plasma of trout (Salmo gairdneri Richardson): Seasonal changes and response to salmon pituitary extract
TL;DR: A simple direct radioimmunoassay for 17α,20β-dihydroxy-4-pregnen-3-one in plasma of female rainbow trout was developed and two antisera were evaluated and both were found to be highly specific.
Journal ArticleDOI
Steroid hormones in the plasma of salmon at various states of maturation.
P.J. Schmidt,D.R. Idler +1 more
TL;DR: There is a quantitative change in certain plasma steroids which coincides with the beginning of the river phase of the spawning migration, and the results give some support to a “hormone trigger theory” for spawning migration.
Journal ArticleDOI
Role of Prostaglandins in Fish Reproduction
N. E. Stacey,F. W. Goetz +1 more
TL;DR: An increase in prostaglandin F (PGF) levels associated with GtH-induced ovulation occurs in vivo in the pond loach and goldfish and, in goldfish, PG injection reverses this blockade.