한국 특산종 눈동자개, Pseudobagrus koreanus의 생식소 발달과 성분화
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초록
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 mm). The primordial gonad with a genital ridge developed in 5-day prelarva(7.50～9.36 mm). The ovarian differentiation started in about 25-day juvenile(11.58～13.21 mm). 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 mm). The rudiment of sperm duct was appeared in the lower part of the undifferentiated gonad. In 50-day juvenile(16.28～17.06 mm), the ovary started to fill with peri-nucleolus oocytes, and the spermatogonia started to develop. In 250-day juvenile(35.49～51.12 mm), 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.
Abstract
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 mm). The primordial gonad with a genital ridge developed in 5-day prelarva(7.50～9.36 mm). The ovarian differentiation started in about 25-day juvenile(11.58～13.21 mm). 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 mm). The rudiment of sperm duct was appeared in the lower part of the undifferentiated gonad. In 50-day juvenile(16.28～17.06 mm), the ovary started to fill with peri-nucleolus oocytes, and the spermatogonia started to develop. In 250-day juvenile(35.49～51.12 mm), 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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