Changes in gonadotropin and ovarian steroids associated with oocytes maturation during spawning induction in the carp

Levavi-Zermonsky, Berta; Yaron, Z.

doi:10.1016/0016-6480(86)90097-3

Cited by 99 publications

(56 citation statements)

References 29 publications

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“…Some of the testosterone seems to be aromatized, however, since there is a slight but overall increase in estradiol levels. This contrasts to the situation in most fish species studied, where estradiol levels decline during the periovulatory period (Scott et al, 1982b;Kime and Dolben, 1985;Van der Kraak et al, 1985;Levavi-Zermonsky and Yaron, 1986;Liley et al, 1986). Injection of 17a-P in our experiments caused significant increases in plasma GTH and testosterone levels.…”

Section: Discussionmentioning

confidence: 41%

“…It has been well established in cypriniform and salmoniform teleosts that the preovulatory rise in serum gonadotropin, either natural or induced, stimulates the ovarian production of 17~P and 17a-hydroxy, 20/3-dihydroprogesterone (17a, 2Op-P) (e.g. carp - Breton et al, 1983;Kime and Dolben, 1985;Levavi-Zermonsky and Yaron, 1986;salmonids -Liley et al, 1986;Scott et al, 1982a, b;Van der Kraak et al, 1985;white sucker, Cutostomus commersonii-Scott et al, 1984). A similar situation is found in the African catfish, order Siluriformes (Lambert and Van Den Hurk, 1982).…”

Section: Introductionmentioning

confidence: 99%

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The effect of pimozide/LHRHa and 17α-hydroxyprogesterone on plasma steroid levels and ovulation in the African catfish, Clarias gariepinus

Richter¹,

Eding²,

Goos

et al. 1987

Aquaculture

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The effect was studied of a preovulatory gonadotropic hormone (GTH) surge, induced by pimozide/LHRHa treatment, and of 17a-hydroxyprogesterone on oocyte maturation and ovulation and on the plasma levels of 17a-hydroxyprogesterone, 17a-hydroxy-20/I-dihydroprogesterone, testosterone and estradiol. GTH and 17o-hydroxyprogesterone initially caused an increase in plasma testosterone levels, followed by an increase in 17a-hydroxy-20@-dihydroprogesterone. Neither treatment affected estradiol levels. All fish treated with pimozide/LHRHa or 17a-hydroxyprogesterone showed oocyte maturation and ovulation.

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Section: Discussionmentioning

confidence: 41%

Section: Introductionmentioning

confidence: 99%

The effect of pimozide/LHRHa and 17α-hydroxyprogesterone on plasma steroid levels and ovulation in the African catfish, Clarias gariepinus

Richter¹,

Eding²,

Goos

et al. 1987

Aquaculture

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show abstract

“…Embryos which were positive for the foreign sequence were obtained in normal 7-day-old embryos derived from oocytes at each stage, even in embryos from oo cytes more than 16 h before ovulation in which no positive embryos were obtained in the previous study. 2) In addition, the rates of positive embryos in oocytes collected 16-10 and 6 h before ovulation were the same or higher than those reported in the previous study (1,4,8,18, and 2% for 16, 14, 12, 10, and 6 h before ovulation, respectively) 2) Only the rate of positive embryos in oocytes collected 8 h before ovulation was lower than that in the pre vious study.2)…”

contrasting

confidence: 42%

Successful Foreign Gene Transfer into Medaka by Microinjection into Oocytes at Early Stages of Maturity

Inoue

Yamashita

1993

NSUGAF

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“…IRcGTH, estradiol and 17, 20-P were measured in the serum samples. This experiment is part of a wider study reported elsewhere (Levavi-Zermonsky and Yaron, 1986). All non-percent data are expressed as group mean + SEM.…”

Section: Ovarian Events and Hormonal Profile During Spawning Inductionmentioning

confidence: 99%

“…Two females, differing in size or other external features, were housed in each tank in order to enable individual identification. At noon of the following day an ovarian sample was taken from each female by biopsy, and the oocytes stages were determined after clearing the tissue sample (details in Levavi-Zermonsky and Yaron, 1986). The females were injected intramuscularly with a priming dose of a calibrated carp pituitary extract (Dag Shan Ltd., Beit Shah, Israel; see Yaron et al 1984) containing immunoreactive GTH (IR-cGTH; 0.1 mg/kg bw).…”

Section: Suitability O F Female Carp For Spawning Inductionmentioning

confidence: 99%

Fluctuations in gonadotropin and ovarian steroids during the annual cycle and spawning of the common carp

Yaron

Levavi-Zermonsky

1986

Fish Physiol Biochem

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The main objective of the paper is to describe the annual changes in hormones associated with reproduction in the female carp under the conditions prevailing in the Israeli fish culture. Fish were sampled monthly throughout 1984; gonadosomatic index (GSI) was calculated and the diameter of ovarian follicles was measured. Gonadotropin (GTH) content in the pituitary and the circulating GTH, estradiol, testosterone and 17α, 20β-dihydroxy-4-pregnen-3-one (17, 20-P) were determined by specific radioimmunoassays. GTH, estradiol and testosterone showed a bimodal annual pattern. The late summer peak was associated with initial vitellogenesis while the peak in spring occurred just before spawning, which took place in April-May. A resting phase in ovarian activity was noted in June and July. The levels of 17, 20-P were very low compared with those occurring during spawning induction. The paper summarizes a previous study by our laboratory on the changes in circulating hormones, as related to oocyte stages, in female carp induced to spawn by a GTH-calibrated pituitary extract. This study associates the short but prominent peak in 17, 20-P with the presence of follicles with maturing oocytes in the ovary. A correlation was found between the percentage of oocytes with eccentric germinal vesicle initially present in ovarian biopsies of females carp and their spawning success after hypophysation. The paper describes simple means to ensure successful induction of spawning in carp by utilizing a calibrated pituitary extract and prior selection of females that would respond to the induction treatment.

show abstract

Changes in gonadotropin and ovarian steroids associated with oocytes maturation during spawning induction in the carp

Cited by 99 publications

References 29 publications

The effect of pimozide/LHRHa and 17α-hydroxyprogesterone on plasma steroid levels and ovulation in the African catfish, Clarias gariepinus

The effect of pimozide/LHRHa and 17α-hydroxyprogesterone on plasma steroid levels and ovulation in the African catfish, Clarias gariepinus

Successful Foreign Gene Transfer into Medaka by Microinjection into Oocytes at Early Stages of Maturity

Fluctuations in gonadotropin and ovarian steroids during the annual cycle and spawning of the common carp

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