Journal article
Physiological changes in the spawning gilthead seabream, Sparus aurata, succeeding the removal of males
Journal of Experimental Zoology, Vol.292(6), pp.555-564
2002
Abstract
The physiological effects triggered in females by the removal of males from a group of spawning fish were examined in the multiple batch spawner, the gilthead seabream, Sparus aurata. One week after the removal of males, a large portion of the oocytes underwent atresia, and sporadic release of low quality eggs continued at low frequency over a period of seven weeks. The transcript levels of the three native gonadotropin releasing hormone (GnRH) forms, salmon (s)GnRH, seabream (sb)GnRH, and chicken (c)GnRH-II, and the two GtH subunits were measured. Brain mRNA levels for all three GnRHs and pituitary LH mRNA levels significantly declined in the females as a result of removing the males compared to females that were maintained with males. Pituitary FSH mRNA levels showed the opposite trend and were significantly higher in females that were separated from males. Circulating levels of LH, testosterone, estradiol, 17,20-dihydroxy-4-pregnen-3-one, and 17,20,21-trihydroxy-4-pregnen-3-one all declined in the group of females without males. These results imply the existence of an endocrine response to socio-sexual stimuli during the reproductive process in the gilthead seabream.
Details
- Title
- Physiological changes in the spawning gilthead seabream, Sparus aurata, succeeding the removal of males
- Authors
- I Meiri (Author) - National Center for Mariculture, IsraelY Gothilf (Author) - National Center for Mariculture, IsraelY Zohar (Author) - University of Maryland, United StatesAbigail Elizur (Author) - National Center for Mariculture, Israel
- Publication details
- Journal of Experimental Zoology, Vol.292(6), pp.555-564
- Publisher
- John Wiley & Sons Inc.
- Date published
- 2002
- DOI
- 10.1002/jez.10072
- ISSN
- 0022-104X
- Organisation Unit
- University of the Sunshine Coast, Queensland; Centre for Bioinnovation
- Language
- English
- Record Identifier
- 99450052302621
- Output Type
- Journal article
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