Structure and Function of Kisspeptin and Gonadotropin Releasing Hormone Neuroendocrine Systems and Their Application in Aquaculture Systems

By : S. Selvaraj , Cheryl Antony , P. Ruby , V. Ezhilarasi , Robinson Jeya Shakila

Page No: 63-71

Abstract
Gonadotropin releasing hormone (GnRH) is the major neuroendocrine hormone regulating reproduction in vertebrates, including finfish and shellfish. In recent years, using in vitro and in vivo studies, kisspeptins has been shown to act as upstream modulator of GnRH secretion in few finfish species. Surprisingly, shellfish GnRH do not cluster within finfish GnRH, suggesting diversity in gnRH genes and their evolution in animal kingdom. Kisspeptin and GnRH analogues have been synthesized chemically and successfully used in induced reproduction of finfish. Studies on Kisspeptin and GnRH potency in induced maturation and spawning of shellfish are scarce. Seasonally, fish broodstock raised in captivity exhibit different form of reproductive dysfunction at the level of the neuroendocrine brain-pituitary-gonad axis. Reproductive dysfunctions are also observed during sexual differentiation and pubertal onset periods. To overcome these problems in the captivity, different hormonal preparations including kisspeptin and gonadotropin-releasing hormone preparations are used. The present paper highlights the structure and function of multiple kisspeptin and GnRH systems in fish and their application for controlling reproduction in aquaculture systems.

Authors :
S. Selvaraj, Cheryl Antony, P. Ruby, V. Ezhilarasi and R. Jeya Shakila
Department of Aquaculture, Dr. M.G.R. Fisheries College and Research Institute, Tamil Nadu Dr. J. Jayalalithaa Fisheries University, Ponneri-601204, Thiruvallur District, Tamil Nadu, India.
 

DOI: http://doi.org/10.32381/JAT.2022.37.1-4.6