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Annual Reproductive Cycle of Acheilognathus rhombeus, in Korea
기세운,고강희,이원교 한국발생생물학회 2019 발생과 생식 Vol.23 No.4
In this study, an experiment was conducted to investigate the annual reproductive cycle of a Korean flat bittering, Acheilognathus rhombeus, from Ogok-myeon located in Seomjin River. The reproductive cycle was examined histologically regarding water temperature and day length of the habitat, the gonadosomatic index (GSI), and developmental characteristics of female and male gonads. The maximum GSI was found to be 3.50±0.53 and 1.36±0.14 for females and males, respectively, when the water temperature and day light was 16.9℃ and 11.3 hours, respectively in October 2018. On the other hand, the minimum GSI was found to be 0.16±0.09 and 0.69±0.15 for males and females in December 2018 and February 2019, respectively. The ovipositor of females appeared from August to November 2018. We compared and calculated the stages of germ cell developmental characteristics in the testis and ovaries to determine the reproductive cycle. According to the result, we classified the female A. rhombeus reproductive cycle into four phases, which are ripe and spawning phase (October), degenerative phase (November to December), growing phase (January to March) and mature phase (April to September). The annual reproductive cycle of male A. rhombeus was categorized into four phases: mature phase (June to October), degenerative phase (November to March), resting phase (April) and growing phase (May). The Korean flat bittering is an autumn-spawner as the main spawning season in October. In male, testicular spermatogonia appeared all yearround, and the ripe and releasing phase, which is characteristics of the spawning season in other fish, did not appear.
이동근,박준택,기세운,최보현,김경선,임창용,고경동,이지수,이경식,이경우 한국패류학회 2021 The Korean Journal of Malacology Vol.37 No.4
This study researched seed production technology for bivalvia soft-shell clam. The result of the experiment on the fertilized egg development showed the fertilized egg was 80.8 mm, and it took 29 hours to reach the stage of the D-shaped larvae at a water temperature of 17°C. The first feeding of larva took place 44 hours after fertilization. The D-shaped production of soft-shell clam fertilized eggs was in the range of 17-23℃ in water temperature and 30-33℃-77-78% in salt concentration. Based on the experimental results, foot was formed at shell length 231.6 ± 10.6 μm around 15 days after fertilization according to the results of mass seed production at 17.2-24.5℃, 31.2-33.6%, and landing was completed at shell length 258.4 ± 10.6 μm around 20 days after fertilization. Plantigrade larvae reached average shell length 1 mm around 44 days after seed production, and an average of 3 mm around 66 days.
한국 특산종 눈동자개, Pseudobagrus koreanus의 생식소 발달과 성분화
박진석,이원교,박충국,허승준,기세운,최낙현 한국발생생물학회 2008 발생과 생식 Vol.12 No.3
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.