Ovarian development and related changes in steroid hormones in female wild common carp (Cyprinus carpio carpio), from the south-eastern Caspian Sea.

Wild common carp (Cyprinus carpio carpio) is a native valuable but threatened species from the south-eastern Caspian Sea in which the endocrine control of its reproduction has not been studied. The objectives of this research were to study the reproductive strategy and changes in steroid hormones during ovarian development. From October 2009 to June 2010, 65 adult females were caught from the Golestan coast (Iran) and the ovarian histology, and gonadosomatic and hepatosomatic indices (GSI and HSI) were studied. Also, the plasma profiles of steroid hormones including testosterone (T), 17β-estradiol (E2) and 17α-, 20β-dihydroxyprogesterone (DHP) were measured by radioimmunoassay. The GSI increased gradually during sampling times and reached maximum value at the peak of reproduction season, but the HSI decreased during spawning season. All stages of ovarian development, except the stage of Balbiani bodies, were recorded macro- and microscopically. Spent fish were caught at six of nine sampling times. The peaks of spawning were at late winter and early spring. The results of this study showed that the majority of wild carp collected during the sampling period displayed asynchronous oocyte development. Plasma T showed no significant differences during sampling times or at different stages of ovarian development. The level of E2 decreased gradually during sampling times reached minimum value at the spawning season, and highest value was recorded at tertiary vitellogenesis stage. The plasma levels of DHP during late winter and early spring were significantly higher than those of other sampling periods and its maximum level associated with oocyte maturation stage.

[1]  S. A. Harmin,et al.  Plasma sex steroid hormonal profile and gonad histology during the annual reproductive cycle of river catfish Hemibagrus nemurus (Valenciennes, 1840) in captivity , 2013, Fish Physiology and Biochemistry.

[2]  M. Nematollahi,et al.  Comparison of the effects of different methods of mammalian and salmon GnRHa administration on spawning performance in wild-caught female carp (Cyprinus carpio carpio) from the Caspian Sea , 2011 .

[3]  Graham Young,et al.  Oogenesis in teleosts: how eggs are formed. , 2010, General and comparative endocrinology.

[4]  B. Levavi-Sivan,et al.  Spawning Induction in the Carp: Past Experience and Future Prospects - A Review , 2009 .

[5]  B. Jalabert,et al.  Steroidogenesis in rainbow trout (Salmo gairdneri) at various preovulatory stages: changes in plasma hormone levels andin vivo andin vitro responses of the ovary to salmon gonadotropin , 1986, Fish Physiology and Biochemistry.

[6]  K. Walker,et al.  Spawning dynamics of common carp in the River Murray, South Australia, shown by macroscopic and histological staging of gonads , 2004 .

[7]  P. Brown,et al.  Maturation and Reproductive Biology of Female Wild Carp, Cyprinus carpio, in Victoria, Australia , 2003, Environmental Biology of Fishes.

[8]  M. Delgado,et al.  Seasonal changes in plasma gonadal steroid concentrations and gonadal morphology of male and female tench (Tinca tinca ,L.) , 2003 .

[9]  J. Rinchard,et al.  Liver changes related to oocyte growth in roach, a single spawner fish, and in bleak and white bream, two multiple spawner fish , 2003 .

[10]  J. Rinchard,et al.  Comparative study of reproductive biology in single and multiple‐spawner cyprinid fish. II. Sex steroid and plasma protein phosphorus concentrations , 1997 .

[11]  J. Rinchard,et al.  Comparative study of reproductive biology in single- and multiple-spawner cyprinid fish. I. Morphological and histological features , 1996 .

[12]  E. Balon Origin and domestication of the wild carp, Cyprinus carpio: from Roman gourmets to the swimming flowers , 1995 .

[13]  Y Nagahama,et al.  Endocrine regulation of gametogenesis in fish. , 1994, The International journal of developmental biology.

[14]  J. Rinchard,et al.  Seasonal changes in plasma levels of steroid hormones in an asynchronous fish the gudgeon Gobio gobio L. (Teleostei, Cyprinidae). , 1993, General and comparative endocrinology.

[15]  G. West Methods of Assessing Ovarian development in Fishes: a Review , 1990 .

[16]  K. Aida A review of plasma hormone changes during ovulation in cyprinid fishes , 1988 .

[17]  K. Aida,et al.  Hormone changes during the ovulatory cycle in goldfish. , 1988, General and comparative endocrinology.

[18]  K. Aida,et al.  Plasma Gonadotropin and Steroid Hormone Profiles During Ovulation in the Carp Cyprinus carpio , 1986 .

[19]  Madalynne Schoenfeld Seasonal changes , 1983 .

[20]  Y. Zohar,et al.  7 The Gonadal Steroids , 1983 .

[21]  Kelly Selman,et al.  Cellular and dynamic aspects of oocyte growth in teleosts , 1981 .

[22]  A. Fostier,et al.  Profiles of plasma gonadotropin and 17 beta-estradiol in the common carp, Cyprinus carpio L., as related to spawning induced by hypophysation or LH-RH treatment. , 1980, Reproduction, nutrition, developpement.