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KMID : 0894520100140040225
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Development & Reproduction
2010 Volume.14 No. 4 p.225 ~ p.231
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Gonadal Development and Reproductive Cycle of Red Sea Urchin Pseudocentrotus depressus
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Kim Jae-Woo
Lee Chi-Hoon
Lee Young-Don
Chung Sang-Chul
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Abstract
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Gonadal development and reproductive cycles of red sea urchin Pseudocentrotus depressus were investigated based on the monthly variations of gonadosomatic index (GSI), gametogenesis and developmental phases of gonad. The specimens were sampled monthly in the north coastal waters of Ongpo and the south coastal waters Bubhwan of Jeju Island, Korea, from December 1994 to December 1995. Monthly changes of GSI values and reproductive cycles showed similar trends in Ongpo and Bubhwan. In females GSI values were reached the maximum in December (17.8±4.04 in Ongpo, 13.8±1.51 in Bubhwan). In males GSI values were reached the maximum in December (15.4±1.53 in Ongpo, 13.6±1.32 in Bubhwan). In both Ongpo and Bubhwan major spawning probably occurred between November and February when water temperatures and daylengths decrease. The histological observations of the gonads suggested that this species seemed to have a synchronous gametogenesis and one spawning season a year in Jeju Island costal waters.
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KEYWORD
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Gonadal development, Reproductive cycle, Gonadosomatic index, Red sea urchin, Pseudocentrotus depressus
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