Gonadotropin-releasing hormone-immunoreactive neuronal structures in the brain and pituitary of the African catfish,Clarias gariepinus (Burchell) |
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| Authors: | Dr. H. J. Th. Goos R. de Leeuw C. de Zoeten-Kamp J. Peute S. Blähser |
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| Affiliation: | (1) Zoological Laboratory, Research Group for Comparative Endocrinology, State University of Utrecht, Utrecht, The Netherlands;(2) Department of Anatomy and Cytobiology, Justus Liebig University, Giessen, Federal Republic of Germany;(3) Zoological Laboratory, State University of Utrecht, Padualaan 8, 3584 CH Utrecht, The Netherlands |
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| Abstract: | Summary The distribution of gonadotropin-releasing hormone (GnRH) immunoreactivity was studied in the African catfish, Clarias gariepinus, by means of immunofluorescence and immunoperoxidase techniques. Immunoreactive neurons were found throughout the preoptic nucleus (NPO). However, only a portion of the secretory perikarya in the NPO showed a positive reaction by use of an anti-LHRH serum. Numerous immunoreactive fibres were found to enter the pituitary and to terminate in its proximal pars distalis, the site of concentration of the gonadotropic cells. Since GnRH is present in the brain and pituitary of the African catfish, the lack of spontaneous ovulation in captivity is apparently due to an insufficient release of GnRH. |
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| Keywords: | GnRH Neuropeptide immunocytochemistry African catfish (Clarias gariepinus) |
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