The ontogeny of gonadotropin-releasing hormone neurons in the red seabream, Pagrus major
Ookura, T.; Okuzawa, K.; Tanaka, H.; Gen, K.; Kagawa, H. (2000). The ontogeny of gonadotropin-releasing hormone neurons in the red seabream, Pagrus major, in: Norberg, B. et al. (Ed.) Proceedings of the 6th International Symposium on the Reproductive Physiology of Fish, Bergen, Norway, July 4-9, 1999. pp. 47-49
In: Norberg, B. et al. (2000). Proceedings of the 6th International Symposium on the Reproductive Physiology of Fish, Bergen, Norway, July 4-9, 1999. International Symposium on the Reproductive Physiology of Fish, 6. Department of Fisheries and Marine Biology, University of Bergen: Bergen. ISBN 82-7461-048-2. 499 pp., more
In: International Symposium on the Reproductive Physiology of Fish. Museo Nacional de Ciencias Naturales. , more
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| Authors | | Top |
- Ookura, T.
- Okuzawa, K.
- Tanaka, H.
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| Abstract |
We investigated the ontogeny of three gonadotropin-releasing hormone (GnRH) neuronal systems in the brain of red seabream, Pagrus major, using immunocytochemistry. Salmon (s) GnRH immunoreactive (ir) cells were first detected on one day after hatching (day 1) in the olfactory pit. Then, sGnRH-ir cells were observed along the olfactory nerve and in the telencephalon. Chicken (c) GnRH-II-ir axons and cell bodies were first observed in the midbrain tegmentum on day 3 and day 6, respectively. Immunoreactivity to seabream (sb) GnRH first emerged in cell bodies in the preoptic area (POA), in axons from the POA to the pituitary, and in the neurohypophysis around day 40. These results suggest that the terminal nerve (sGnRH), preoptic (sbGnRH), and midbrain (cGnRH-II) systems have distinct ontogenetic origins. |
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