Publication: The existence of gonadotropin-releasing hormone (GnRH) immunoreactivity in the ovary and the effects of GnRHs on the ovarian maturation in the black tiger shrimp Penaeus monodon
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Issued Date
2008-07-02
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ISSN
00448486
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2-s2.0-45249090114
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Mahidol University
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SCOPUS
Bibliographic Citation
Aquaculture. Vol.279, No.1-4 (2008), 197-203
Suggested Citation
Apichart Ngernsoungnern, Piyada Ngernsoungnern, Wattana Weerachatyanukul, Jittipan Chavadej, Prasert Sobhon, Prapee Sretarugsa The existence of gonadotropin-releasing hormone (GnRH) immunoreactivity in the ovary and the effects of GnRHs on the ovarian maturation in the black tiger shrimp Penaeus monodon. Aquaculture. Vol.279, No.1-4 (2008), 197-203. doi:10.1016/j.aquaculture.2008.04.018 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/18714
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Title
The existence of gonadotropin-releasing hormone (GnRH) immunoreactivity in the ovary and the effects of GnRHs on the ovarian maturation in the black tiger shrimp Penaeus monodon
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Abstract
Immunocytochemical localization using antibodies against five isoforms of gonadotropin-releasing hormone (GnRH), namely, luteinizing hormone-releasing hormone (LHRH), salmon (s)GnRH, octopus (oct)GnRH, lamprey (l)GnRH-I, and lGnRH-III, showed that only lGnRH-I immunoreactivity (ir-lGnRH-I) was localized in follicular cells of proliferative, vitellogenic, and mature ovaries. The effects of exogenous GnRHs on the ovarian maturation cycle of Penaeus monodon were compared by treating female broodstocks with LHRH, sGnRH, and lGnRH-I. The cycle of ovarian maturation in both eyestalk-ablated and eyestalk-intact shrimp administered with the three isoforms of GnRH was significantly shorter than that of the control animals. Moreover, administrations of all GnRH isoforms showed similar numbers of spawned eggs and the percentage of successful fertilization as in the control animals. These findings suggest that GnRHs may be highly conserved peptides that play an important role in inducing the ovarian maturation in the shrimp. © 2008 Elsevier B.V. All rights reserved.