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KMID : 0894520150190010033
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Development & Reproduction
2015 Volume.19 No. 1 p.33 ~ p.41
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Gonadal Development, Spawning and Plasma Sex Steroid Levels of the Indoor Cultured Grunt, Hapalogenys nitens
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Kang Hee-Woong
Cho Jae-Kwon
Son Maeng-Hyun
Park Jong-Youn
Hong Chang-Gi
Chung Jae-Seung
Chung Ee-Yung
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Abstract
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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-17B of female H. nitens reached the highest value before the spawning period, and seasonal changes in plasma level of estradiol-17B 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.
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KEYWORD
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Gonadal maturation, Hapalogenys nitens, Steroid hormone
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