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Morphological and endocrine correlates of the reproductive cycle of the aplacental viviparous dogfish, Squalus acanthias.

Abstract：

:Pregnant female spiny dogfish were captured off the coasts of Maine and Massachusetts and morphometric and gravimetric analyses of the liver, gonad, and reproductive tract correlated with the reproductive cycle. Plasma samples were taken and circulating steroids (progesterone, testosterone, and estradiol) were measured by radioimmunoassay. Clear-cut temporal variations in plasma steroid levels were observed, which correlated with the ovarian cycle. Testosterone and estradiol-17 beta levels were low (100-200 pg/ml plasma) in early pregnancy when ovarian follicles were small but increased to about 10 ng/ml as follicles grew and gestation progressed. By contrast, plasma progesterone was high (2-6 ng/ml) in early to mid-pregnancy when corpora lutea were active and declined toward term (less than 1.0 ng/ml).

journal_name

Gen Comp Endocrinol

journal_title

General and comparative endocrinology

authors

Tsang PC,Callard IP

doi

10.1016/0016-6480(87)90266-8

subject

Has Abstract

pub_date

1987-05-01 00:00:00

pages

182-9

issue

2

eissn

0016-6480

issn

1095-6840

journal_volume

66

pub_type

杂志文章

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