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KMID : 0894520080120030215
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Development & Reproduction
2008 Volume.12 No. 3 p.215 ~ p.220
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Gonadal Development and Sex Differentiation of a Korean Endemic Species, Black Bullhead Pseudobagrus koreanus
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Park Jin-Seok
Lee Won-Kyo
Park Chung-Kug
Heo Seung-Joon
Ki Se-Wun
Choi Nak-Hyun
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Abstract
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Sex differentiation process of the spotted Black Bullhead, Pseudobagrus koreanus, was investigated using fish samples of different age after hatching. The primordial germ cells appeared separately under air bladder in 1-day larva (total length: 6.63～6.95 ㎜). The primordial gonad with a genital ridge developed in 5-day prelarva (7.50～9.36 ㎜). The ovarian differentiation started in about 25-day juvenile (11.58～13.21 ㎜). The somatic tissues enlongated in the tip of one end of undifferentiated gonad and fused each other. Thus a small ovarian cavity appeared. The testicular differentiation was initiated in 30-day juvenile (12.19～13.72 ㎜). The rudiment of sperm duct was appeared in the lower part of the undifferentiated gonad. In 50-day juvenile (16.28～17.06 ㎜), the ovary started to fill with peri-nucleolus oocytes, and the spermatogonia started to develop. In 250-day juvenile (35.49～51.12 ㎜), the ovary became bigger and filled with oocytes, and the number of spermatogonia started to increase. Considering these results, the spotted Black Bullhead could be a differentiated type in sex differentiation and gonochorism in sexuality.
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KEYWORD
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Pseudobagrus koreanus, Gonadal development, Sex differentiation
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