Basic and Applied Studies on Gonadotropin-Releasing Hormone Induction of Sperm Production, Ovulation and Spawning in Morone SpeciesProducing fish for farm rearing or closed recirculating systems depends on the regular and predictable supply of their eggs. Unfortunately, the spawning (production of eggs and sperm) of stripers in captivity is difficult to control. In captivity, there is an apparent failure to synthesis or release to the bloodstream, the hormones necessary to final maturation of the eggs. Aquaculturists now depend on injecting ripe fish with a gonadotropin-releasing hormone (GnRH), which assists in ovulation and spermatogenesis (the formulation of sperm). Yonathan Zohar, Thomas Chen and Curry Woods began work in 1992 on studies of the molecular basis of GnRH synthesis and its regulation. One goal has been the development of an insert for the striper which provides timed-release of the GnRH hormone. They have also been studying the structure and regulation of expression of the GnRH gene, which includes the molecular and cellular processes involved in the synthesis and secretion of GnRH hormone in striped bass. In the long term, this work will lead to new approaches for regulating the reproductive cycle of striped bass and other farmed fish. |
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Yonathan Zohar
Thomas T. Chen Center of Marine Biotechnology University of Maryland Biotechnology Institute L. Curry Woods III Crane Aquaculture Facility Wye Research and Education Center Agricultural Experimental Station University System of Maryland |
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