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흰점독가시치 (Siganus canaliculatus)의 생식소 발달 및 생식주기
황형규 ( Hyung Kyu Hwang ),박창범 ( Chang Beom Park ),강용진 ( Yong Jin Kang ),이종하 ( Jong Ha Lee ),노섬 ( Sum Rho ),이영돈 ( Young Don Lee ) 한국수산과학회 2004 한국수산과학회지 Vol.37 No.5
N/A Annual reproductive cycle of Siganus canaliculatus was studied based on monthly variation of gonadosomatic index (GSI) and histological changes of gonads. Samples were monthly collected by a set net along the southern coast of Jeju Island, Korea from January to December, 1996. Variation of the monthly mean GSI values showed similar trends in female and male. The GSI values increased from June and reached a peak in the spawning season in July (9.65±1.96 in females, 10.00±4.27 in males), and decreased rapidly thereafter. Female hepatosomatic index (HSI) values ranged from 1.26±0.22 (in April) to 2.34±0.39 (in July), and male HSI values ranged from 1.27±0.21 (in April) to 1.87±0.30 (in October). Annual reproductive cycle was classified into the following successive stages: in female, growing stage (from February to June), mature stage (from June to July), ripe and spawning stage (from July to August), recovery stage (from August to March); and in male, growing stage (from January to June), mature stage (from June to July), ripe and spent stage (from July to August), and recovery stage (from August to April). Based on these data, this species has a group-synchronous oocyte development and one spawning season a year.
참다랑어 양식 : 욕지도 식물플랑크톤 군집구조 및 부침식 가두리 적정 침강수심
조은섭,황형규,Cho, Eun-Seob,Hwang, Hyung-Kyu 해양환경안전학회 2010 해양환경안전학회지 Vol.16 No.4
We have cultured the bluefin tuna in Yokjido, Tongyeong with floating cage which was vulnerable to harmful dinoflagellate, Cochiodinium polykrikoides. This study inspected a vertical migration of phytoplankton and Chl-a for reasonable sinking depth in floating cage. Furthermore, we analyzed the fluctuation of the phytoplankton including harmful dinoflagellates occurring in Yokgido for 6 years. Total cell density showed a significant monthly variation and the flora was predominated with diatoms. Gymnodinium sp. occurred 19 times, the greatest number of occurrence in all kinds of dinoflagellates during summer. In particular, the total number of occurrence at C. polykrikoides was 8, and harmful dinoflagellates such as Karenia brevis/Fibrcapsa japonica occurred. The relationship between Chl-a concentration/total cell number and sunset/sunrise was significant and reasonable sinking depth in floating cage was found to be at least 3m from the water surface, which was associated with massive fish kills caused by C. polykrikoides. 본 연구에서는 경남 통영 욕지도에 참치양식용 내파성 가두리 설치시 Cochlodinium polykridoides 적조 발생에 대한 적정 침강 깊이를 설정하기 위하여 장시간 동안 C. polykrikoides의 수직이동 현상을 조사하였다. 욕지도 근해의 식물플랑크톤 총 세포밀도는 월별에 따라 매우 큰 변동폭을 보이고 있으며, 대부분 규조류가 우점종으로 출현하고 있다. 여름철 와편모조류의 종 조성을 보면 Gymnodinium sp.가 총 19회로 가장 많은 출현 횟수를 보였고, 특히 C. polykrikoides도 총 8회로 나타났다. 또한 Karenia brevis 및 Fibrocapsa japonica와 같은 유독성 적조생물도 출현하여 이 지역에서 식물플랑크톤에 대한 장기적 모니터링이 필요할 것이다. 일출과 일몰에 따른 Chl-a 농도의 변화와 총 세포수의 변화는 상호 유의한 상관성을 나타내어 부침식 가두리 양식장은 표층으로부터 최소한 3m 침강시켜야 C. polykrikoides 적조로 인한 피해를 현저히 감소시킬 수 있을 것이다.
수온과 염분이 참전복, Haliotis discuss hannai의 혈림프액 성상과 유리아미노산 조성에 미치는 영향
양성진,이정용,황형규,민병화,신윤경,명정인,Yang, Sung Jin,Lee, Jeong Young,Hwang, Hyung Kyu,Min, Byung Hwa,Shin, Yun Kyung,Myeong, Jeong In 한국해양생명과학회 2016 한국해양생명과학회지 Vol.1 No.1
Glucose was continuously increased as time was elapsed under the temperature at 6℃ and 4℃. NH<sub>3</sub> was significantly increased at 4℃. AST was increased as temperature and salinity were decreased which indicated that it was affected by temperature, salinity and interaction of temperature×salinity. ALT was significantly increased as temperature was decreased. Free amino acid contents, excluding aspartic acid, threonine, serine and glycine were increased as temperature was decreased. This decreasing tendency was also observed when salinity was decreased. Taurine, aspartic acid, glutamic acid and arginine were significantly increased as salinity was decreased, while glycine, alanine, methionine, tyrosine, and histidine were decreased as salinity was decreased. The result of this study suggested that transport condition to minimize the stress is considered in the range of 30~34 psu, 8~10℃.
저산소 노출에 따른 감성돔(Acanthopagrus schlegelii)의 생리학적 스트레스 반응
민병화 ( Byung Hwa Min ),박미선 ( Mi Seon Park ),명정인 ( Jeong In Myeong ),황형규 ( Hyung Kyu Hwang ) 한국수산과학회 2013 한국수산과학회지 Vol.46 No.6
The black seabream Acanthopagrus schlegelii is an important species for aquaculture in Korea. There are, however, no reports on the physiological responses to hypoxia in this species. The objective of this study was to evaluate the effects of acute hypoxia on the physiological stress responses (plasma cortisol as the primary response, and plasma glucose, hematocrit (Ht), hemoglobin (Hb), sodium, chloride, osmolality, AST, ALT and total protein as the secondary responses) of the fish. The experimental fish were exposed to 0.5 ppm dissolved oxygen (DO) in the seawater via two methods (progressive stepwise decline (Exp.Ⅰ), and direct decline (Exp.Ⅱ)). A highly significant increase was detected in plasma cortisol levels due to the hypoxia treatments, and fish in Exp.Ⅰ had hormone levels that were significantly higher than the fish in Exp.Ⅱ. For plasma glucose, there was no significant difference between the Exp.Ⅰ fish and the control fish, whereas Exp.Ⅱ fish showed significantly higher plasma glucose levels than Exp.Ⅰ fish and control fish. Ht values increased in both hypoxia treatments; however, Hb concentrations increased only in Exp.Ⅰ. Although plasma chloride levels were unaffected by acute hypoxia, plasma sodium and osmolality levels increased in Exp.Ⅰ. Progressive hypoxia (Exp.Ⅰ fish) increased plasma AST, ALT and total protein. These results suggest that the value and direction of changes to the investigated parameters can be used to determine the resistance of black seabream to acute hypoxia