title: Gonadal Development, Spawning and Plasma Sex Steroid Levels of the Indoor Cultured Grunt, Hapalogenys nitens.
abstract: The gonadosomatic index (GSI), gonadal development and changes in hormones in plasma level of the indoor cultured grunt (Hapalogenys nitens) were investigated by histological study from August 2011 to October 2012. The GSI showed similar trends with gonad developmental stages during the culture periods. Changes in plasma level of estradiol-17β of female H. nitens reached the highest value before the spawning period, and seasonal changes in plasma level of estradiol-17β were similar in trends of oocyte developments and GSI changes. Testosterone levels of male H. nitens reached the highest value before and after the spent stage. Ovarian developmental stages of H. nitens could be classified into early growing stage, late growing stage, mature stage, ripe and spawning stage, recovery and resting stage. The testicular developmental stages could be divided into growing stage, mature stage, ripe and spent stage, and recovery and resting stage.
authors.affiliation: Southwest Sea Fisheries Research Institute, Yeosu 556-823, Korea.
authors.forename: Hee Woong
authors.initials: HW
authors.lastname: Kang
authors.affiliation: Southwest Sea Fisheries Research Institute, Yeosu 556-823, Korea.
authors.forename: Jae-Kwon
authors.initials: JK
authors.lastname: Cho
authors.affiliation: Southwest Sea Fisheries Research Institute, Yeosu 556-823, Korea.
authors.forename: Maeng-Hyun
authors.initials: MH
authors.lastname: Son
authors.affiliation: Southwest Sea Fisheries Research Institute, Yeosu 556-823, Korea.
authors.forename: Jong Youn
authors.initials: JY
authors.lastname: Park
authors.affiliation: Southwest Sea Fisheries Research Institute, Yeosu 556-823, Korea.
authors.forename: Chang Gi
authors.initials: CG
authors.lastname: Hong
authors.affiliation: Dept. of Urinology, College of Medicine, Inje University, Busan 614-735, Korea.
authors.forename: Jae Seung
authors.initials: JS
authors.lastname: Chung
authors.affiliation: Faculty of Marine Applied Biosciences, Kunsan National University, Gusan 573-701, Korea.
authors.forename: Ee-Yung
authors.initials: EY
authors.lastname: Chung
keywords: Gonadal maturation; Hapalogenys nitens; Steroid hormone