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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℃.
수온과 염분이 조피볼락, Sebastes schlegeli의 생존, 대사 및 조직학적 변화에 미치는 영향
양성진(Sung Jin YANG),이정용(Jeong Young LEE),신윤경(Yun kyung SHIN),황형규(Hyung Kyu HWANG),명정인(Jeong-In MYEONG) 한국수산해양교육학회 2016 水産海洋敎育硏究 Vol.28 No.4
The suitable temperature and salinity for the long-distance transportation for the rockfish were investigated by assessing survival rate, metabolism, histological change. All experimental groups showed survival rates of 100%. Daily Oxygen consumption rhythm was decreased during nights and increased during days. Average oxygen consumption was significantly decreased as temperature and salinity were decreased. Ammonia excretion was significantly increased as temperature and salinity were decreased. Histological changes were observed in the skin and gill of the rockfish exposed to 10 psu under all the temperature conditions, with larger changes at 4℃. Further, nucleus deformation and uniformity in the cytoplasm were also observed.
능성어(Epinephelus septemfasciatus) 치어의 생존율과 혈액학적 특성 변화에 미치는 암모니아 노출의 영향
김정현 ( Jung Hyun Kim ),박종연 ( Jong Youn Park ),이정용 ( Jeong Yong Lee ),이진환 ( Jin Hwan Lee ),황형규 ( Hyung Kyu Hwang ),조재권 ( Jae Kwon Cho ) 한국어류학회 2017 韓國魚類學會誌 Vol.29 No.1
본 연구는 능성어 (Epinephelus septemfasciatus)를 해수 순환여과양식시스템 (RAS)에 적용하는데 문제가 되는 암모니아의 농도 기준을 제시하기 위하여 96시간 동안 암모니아 노출에 따른 생존율 및 혈액학적 특성 변화를 조사하였다. 생존율 실험구의 암모니아 농도는 대조구, 0.35, 0.4, 0.5, 0.8 mg/L였으며, 96-h LC<sub>50</sub> 농도는 0.6 mg/L로 나타났다. 능성어 치어의 암모니아 96-h LC<sub>50</sub> 농도인 0.6 mg/L에서 0, 3, 6, 12, 24, 48, 72, 96시간 간격으로 12마리씩 혈액 샘플링을 하였다. 실험구의 암모니아 노출 시간이 경과할수록 혈장 코티졸, 글루코스, GOT 및 GPT 농도가 증가하는 경향을 보였다. 혈장 암모니아와 총 단백질은 암모니아 노출 12시간째까지는 증가하였고 이후로는 감소하였지만, 대조구와 비교하여 유의하게 높은 값을 나타내었다. 또한 혈장 전해질이온 (Na<sup>+</sup>, Cl<sup>-</sup>)과 삼투압은 감소하는 경향이 관찰되었다. We investigated that changes of survival rate and hematological factors in sevenband grouper (Epinephelus septemfasciatus), exposed to ammonia. First, the fish was exposed and was observed survival rate. We observed the survival rate of the fish when exposed at each ammonia concentrations (0, 0.35, 0.4, 0.5, 0.8 mg/L, NH<sub>3</sub>) for 96 hours. The 96-h LC<sub>50</sub> (lethal ambient concentration for 50% of the population) of NH<sub>4</sub><sup>+</sup> and un-ionized ammonia (NH<sub>3</sub>) for sevenband grouper were 26.7 and 0.6 mg/L, respectively. Secondly, we exposed the fish to 96-h LC<sub>50</sub> ammonia concentration (0.6 mg/L) for 96 hours, then sampled the blood of groupers for analysis of cortisol, glucose, NH<sub>3</sub>, GOT, GPT, total protein (TP), electrolytes (Na<sup>+</sup>, Cl<sub>-</sub>) and osmolality in plasma. The plasma cortisol, glucose, GOT and GPT were increased with increasing of elapsed time and ammonia concentration. In addition, the NH<sub>3</sub> and total protein in plasma were significantly increased to 12 hours exposed to ammonia, and then decreased. But, the values were significantly higher than the control. The plasma electrolytes (Na<sup>+</sup>, Cl<sup>-</sup>) and osmolality were decreased with increasing of elasped time. The results in the present study suggest that the continuous exposure of ammonia to juveniles of sevenband grouper may be a stressor and negative influence.