The effect of 17β-estradiol on spontaneous ovulation in the goldfish, Carassius auratus

1985 ◽  
Vol 63 (12) ◽  
pp. 2979-2981 ◽  
Author(s):  
N. W. Pankhurst ◽  
N. E. Stacey
Keyword(s):  
Body Weight ◽  
Carassius Auratus ◽  
Mature Female ◽  
Goldfish Carassius Auratus ◽  
17Β Estradiol ◽  
Gonadotropin Surge ◽  
Sexually Mature

Sexually mature female goldfish were treated daily with 17β-estradiol in oil (2 μg∙g body weight−1) or given a single silastic pellet containing 17β-estradiol (50 μg∙g−1) and held under conditions which promote spontaneous ovulation. Levels of 17β-estradiol were found to be significantly elevated by the treatments during the period prior to ovulation. However, neither of the 17β-estradiol treatments had any effect on gonadotropin levels or the number of fish ovulating. A decline in the level of serum 17β-estradiol does not appear to be a critical requisite for the occurrence of the preovulatory gonadotropin surge in goldfish.

Effects of orally-administrated mixed-diets on body weight, liver function and initial host defense of goldfish, Carassius auratus

1997 ◽  
Vol 21 (1) ◽  
pp. 71-72
Author(s):  
Yukiko Matsushima ◽  
Chie Kimura ◽  
Kazuki Orita ◽  
Hideki Ino ◽  
Kiyoshi Goto ◽  
...  
Keyword(s):  
Body Weight ◽  
Liver Function ◽  
Host Defense ◽  
Carassius Auratus ◽  
Goldfish Carassius Auratus

Effects of salmon gonadotrophin (SG-G100) on plasma lipids in the goldfish, Carassius auratus

1980 ◽  
Vol 58 (6) ◽  
pp. 957-966 ◽  
Author(s):  
Murray D. Wiegand ◽  
R. E. Peter
Keyword(s):  
Blood Sample ◽  
Carassius Auratus ◽  
Plasma Lipids ◽  
Plasma Lipid ◽  
Sexual Cycle ◽  
Control Solution ◽  
Goldfish Carassius Auratus ◽  
Ovarian Size ◽  
Mature Fish ◽  
Sexually Mature

Female goldfish were held under conditions of 12 °C and a 12 h light: 12 h dark photoperiod during three phases of the sexual cycle. A pretreatment blood sample was taken after 2 weeks of acclimation. Comparison of pretreatment levels of plasma lipids from the three experiments revealed that the concentration of triglycerides (TG) increased and total cholesterol (TC) decreased with increasing ovarian size. Plasma lipid phosphorus (LP) levels were slightly higher in sexually mature fish than in sexually regressed fish. Two weeks after the pretreatment blood sample, the fish were injected intraperitoneally with salmon gonadotrophin (SG-G100) or control solution for 3 days, after which a posttreatment blood sample was taken. In sexually maturing fish injection of SG-G100 caused increased plasma TG levels (compared with pretreatment) in fish with small ovaries, changing to decreased levels in fish with larger ovaries. A similar effect was also seen in maturing fish with plasma TC; these effects were abolished by castration or by keeping fish at 21 °C. SG-G100 had little effect on plasma LP. The results suggest that gonadotrophin causes a net mobilization of lipid in fish with small ovaries (presumably via sex steroids) and accelerated ovarian uptake of lipid in fish with larger ovaries.

Interaction of 17β-estradiol and ketoconazole on endocrine function in goldfish (Carassius auratus)

2013 ◽  
Vol 132-133 ◽  
pp. 19-25 ◽  
Author(s):  
Zhenhua Yan ◽  
Guanghua Lu ◽  
Donghai Wu ◽  
Qiuxia Ye ◽  
Zhengxin Xie
Keyword(s):  
Carassius Auratus ◽  
Endocrine Function ◽  
Goldfish Carassius Auratus ◽  
17Β Estradiol

Waterborne fluoxetine disrupts the reproductive axis in sexually mature male goldfish, Carassius auratus

2010 ◽  
Vol 100 (4) ◽  
pp. 354-364 ◽  
Author(s):  
Jan A. Mennigen ◽  
Wudu E. Lado ◽  
Jake M. Zamora ◽  
Paula Duarte-Guterman ◽  
Valérie S. Langlois ◽  
...  
Keyword(s):  
Carassius Auratus ◽  
Mature Male ◽  
Goldfish Carassius Auratus ◽  
Reproductive Axis ◽  
Sexually Mature

17α,20β-Dihydroxy-4-pregnen-3-one: a steroidal primer pheromone increasing milt volume in the goldfish, Carassius auratus

1986 ◽  
Vol 64 (11) ◽  
pp. 2412-2417 ◽  
Author(s):  
N. E. Stacey ◽  
P. W. Sorensen
Keyword(s):  
Carassius Auratus ◽  
Primer Pheromone ◽  
Goldfish Carassius Auratus ◽  
Final Maturation ◽  
17Β Estradiol ◽  
Releaser Pheromone

The volume of milt that could be stripped from male goldfish, Carassius auratus, increased dramatically when fish were exposed overnight to water with concentrations of 17α,20β-dihydroxy-4-pregnen-3-one (17,20P) as low as 10−10 M. A variety of free steroids (pregnenolone, androstenedione, testosterone, 11-ketotestosterone, 17β-estradiol) and glucuronated steroids (etiocholanolone glucuronide, testosterone glucuronide, 17β-estradiol glucuronide), suggested by others to function as pheromones in fish, failed to increase milt volume at a concentration of 5 × 10−9 M. The milt response appears to be specific to 17,20P and progesterone precursors (17α-hydroxyprogesterone, progesterone), but is most sensitive to 17.20P. Because bilateral section of the olfactory tracts completely blocked the milt response to 17.20P, it is believed to be a pheromone. Selective sectioning of the lateral and medial subdivisions of the olfactory tracts demonstrated that the milt response to 17,20P is dependent on the medial tract. Increases in milt in response to 17,20P are not affected by interaction with conspecifics; exposure to 17,20P induced equivalent responses in males held in isolation, paired with a male, or paired with a female. It is proposed that 17,20P, which is produced during oocyte final maturation in the female, is a "primer" pheromone released to the water and that it increases milt volume in the male. This effect is discussed in relation to releaser pheromone effects previously demonstrated in goldfish.

scholarly journals Ellagitannins – Compounds From Pomegranate as Possible Effector in Steroidogenesis of Rabbit Ovaries

2015 ◽  
pp. 583-585 ◽  
Author(s):  
D. PACKOVA ◽  
A. A. CARBONELL-BARRACHINA ◽  
A. KOLESAROVA
Keyword(s):  
Steroid Hormones ◽  
Mature Female ◽  
Enzyme Linked Immunosorbent Assay ◽  
Control Group ◽  
Progesterone Secretion ◽  
New Zealand White Rabbits ◽  
17Β Estradiol ◽  
Dose Dependent ◽  
Sexually Mature

This study has observed possible effect of ellagitannins – compounds from pomegranate on process of steroidogenesis in ovaries. The aim of the study was to investigate the possible effect of punicalagin on secretion of steroid hormones – progesterone, androstenedione, testosterone and 17β-estradiol by ovarian fragments of rabbits in vitro. Ovarian fragments from sexually mature female New Zealand white rabbits (n=20) were incubated without (control group) or with punicalagin at various doses 1, 10 and 100 μg.ml−1 for 24 h. Hormones were evaluated by ELISA (The Enzyme-Linked Immunosorbent Assay). Data showed that progesterone and 17β-estradiol (but not androstenedione and testosterone) release by rabbit ovarian fragments was significantly affected by punicalagin addition at various doses. Punicalagin (at 100 μg.ml−1) significantly (P<0.05) increased progesterone secretion. On the other hand, the release of 17β-estradiol was significantly (P<0.005) decreased by punicalagin addition (at 10 μg.ml−1). Our results suggest that punicalagin could have dose-dependent impact on secretion of steroid hormones progesterone and 17β-estradiol by rabbit ovarian fragments and it may be effector in process of ovarian steroidogenesis.

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