Plasma Gonadotropin and Steroid Hormone Profiles During Ovulation in the Carp Cyprinus carpio

Santos, Athiê J. G.; Furukawa, Kiyoshi; Kobayashi, Makito; Bando, Koji; Aida, Katsumi; Hanyu, Isao

doi:10.2331/suisan.52.1159

Cited by 50 publications

(25 citation statements)

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“…1986, Fitzpatrich etal. 1986, Truscott et al 1986) and cyprinids b, Stacey et al 1983, Shimizu et al 1985, Santos et al 1986). As oocyte maturation did not occur in the present study, the profile of serum estradio1-17/3 concentration in the Japanese sardine during oocyte maturation and ovulation is still unclear.…”

Section: Discussionmentioning

confidence: 99%

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Annual reproductive cycle of the captive female Japanese sardineSardinops melanostictus: Relationship to ovarian development and serum levels of gonadal steroid hormones

et al. 1991

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Abstract.Gonad and blood samples were taken from the captive female Japanese sardine Sardinops melanostictus between 1988 and 1989, and changes in serum levels of gonadal steroids were correlated with the annual gonadal cycle. Under captive conditions, female fish did not mature and spawn spontaneously, although oocytes developed up to the end of vitellogenic growth. Based on evidence from ovarian histology, the annual gonadal cycle of the Japanese sardine was divisible into four periods, i.e., immature (June to October), vitellogenesis (November to December), spawning (January to March), and post-spawning (April to May). The pattern of seasonal change in the gonadosomatic index (GSI) showed an inverse correlation to change in water temperature and reflected the degree of ovarian maturity. The serum estradiol-17/~ level increased from its lowest concentration (0.12 ng m1-1) in September to a peak (1.14ng m1-1) in March. Serum 17c~,20/%dihydroxy-4-pregnen-3-one (17c~,20/3-P) was detectable at low levels (< 0.3 ng ml-i) between October and February, but was below the assay detection limit (0.06 ng ml-1) at all other times. Testosterone was not detectable (< 0.06 ng ml -1) in the serum of any fish throughout the year. The effects of several steroids on the maturation of follicle-enclosed oocytes of sardine were examined in vitro, and 17e,20/~-P was found to be the most potent inducer of maturation. This suggests that post-vitellogenic oocytes of the Japanese sardine in captivity have an ability to respond to an appropriate hormonal effector and subsequently to resume meiotic maturation.

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Section: Discussionmentioning

confidence: 99%

“…1983b, Stacey etal. 1983, Shimizu et al 1985, Santos et al 1986); white sucker Catostomus commersoni (Scott et al 1984); catfish Heteropneustesfossilis (Lamba et al 1983); brown bullhead Ictalurus nebulosus (Burke et al 1984, Rosenblum et al 1987; and goldeye Hiodon alosoides (Pankhurst et al 1986).…”

Section: Introductionmentioning

confidence: 99%

Annual reproductive cycle of the captive female Japanese sardineSardinops melanostictus: Relationship to ovarian development and serum levels of gonadal steroid hormones

et al. 1991

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“…This is why intrafollicular oocyte maturation of rainbow trout follicles has been used as a bioassay to prepare one of the first salmonid gonadotropins [132]. A typical "ovulatory discharge" of gonadotropin has been observed in some fish species such as the common carp Cyprinus carpio [133], but not in rainbow trout. Instead, in that species, plasma levels of both gonadotropins FSH and LH show a progressive moderate rise, starting respectively about 6 and 4 days (at 12 °C) before the beginning of maturation [112].…”

Section: Oocyte Maturation and Ovulationmentioning

confidence: 99%

Particularities of reproduction and oogenesis in teleost fish compared to mammals

2005

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-Compared to mammals, teleost reproduction presents many original features. Reproductive strategies of species are diversified into numerous adaptations to a large variety of aquatic environments. This diversity may concern sexuality, spawning and parental behaviour, sensitivity to environmental factors, and specific features of gametogenesis such as the duration of vitellogenesis, and egg morphology. Sexuality presents a variety of natural modalities, from gonochorism to hermaphrodism. The absence of definitive arrest of body growth in the adult of most species gives a particular interest to the practical control of growth-reproduction interactions. Vitellogenesis, which represents an important metabolic effort for the maternal organism, involves the synthesis of vitellogenin, a specific glycolipo-phosphoprotein produced in the liver under estradiol stimulation, and its incorporation into oocytes by a receptor mediated process. Both estradiol synthesis in follicle cells and vtg uptake by vitellogenic follicles appear to be mainly controlled by FSH. Oocyte maturation is directly triggered by a progestin, or MIS (maturation inducing steroid) synthesised in follicle cells mainly under LH control, and acting through the non-genomic activation of a membrane receptor. Practical applications of some of these particularities result mainly from the external character of the fertilisation process and of embryonic development, which allows manipulating respectively egg chromosome stocks and sex differentiation. Moreover, the sensitivity of sex differentiation to exogenous factors favours the development of practical methods to control the sex of farmed populations. Finally, the sensitivity of reproductive mechanisms to xenobiotics has led to various kinds of bioassays for putative pollutants.reproductive strategies / sexuality / spawning / vitellogenesis / oocyte maturation / fertilisation

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“…[17][18][19] Ovulation occurs in the dark phase around the time of peak of GTH surge. It is indicated that the onset time of the peak of GTH surge is not determined by the onset time of the elevation of water temperature but by a photoperiodic cue and/or a circadian rhythm.20) In Mendia audens and Brachydanio rerio, there is evidence that daily spawning activity results from a photoperiodically synchroinzed time of ovulation.…”

Section: Discussionmentioning

confidence: 99%

Effects of Photoperiod on Spawning Rhythm in the Tobinumeri-Dragonet Repomucenus beniteguri.

Zhu¹,

Furukawa²,

Aida³

1991

NIPPON SUISAN GAKKAISHI

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Plasma Gonadotropin and Steroid Hormone Profiles During Ovulation in the Carp Cyprinus carpio

Cited by 50 publications

References 0 publications

Annual reproductive cycle of the captive female Japanese sardineSardinops melanostictus: Relationship to ovarian development and serum levels of gonadal steroid hormones

Annual reproductive cycle of the captive female Japanese sardineSardinops melanostictus: Relationship to ovarian development and serum levels of gonadal steroid hormones

Particularities of reproduction and oogenesis in teleost fish compared to mammals

Effects of Photoperiod on Spawning Rhythm in the Tobinumeri-Dragonet Repomucenus beniteguri.

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