• ALGAE
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• 제36권1호
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• pp.37-50
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• 2021

Heterotrophic dinoflagellates Gyrodinium spp. are one of the major grazers of phytoplankton in many coastal waters. Gyrodinium dominans, G. jinhaense, and G. moestrupii have similar morphologies but different edible prey species. To explore the variations in the ecological niches of these three species, we investigated their spatial-temporal distributions in Korean waters. Because of the high similarity in morphology among these three Gyrodinium species, we used real-time polymerase chain reactions to quantify their abundance in water samples that were seasonally collected from 28 stations along the Korean Peninsula from April 2015 to October 2018. Cells of G. dominans were found at all sampling stations, G. jinhaense at 26 stations, and G. moestrupii at 22 stations, indicating that all three species were widely distributed in Korea. Furthermore, all three species displayed strong seasonal distributions. The largest numbers of the stations where G. dominans and G. jinhaense cells were present were found during the summer (26 and 23 stations, respectively), but that for G. moestrupii was found in the autumn (15 stations). The abundance of G. dominans was positively correlated with that of G. jinhaense, but not with that of G. moestrupii. The highest abundances of G. dominans (202.5 cells mL-1) and G. jinhaense (20.2 cells mL-1) were much greater than that of G. moestrupii (1.2 cells mL-1). The highest abundances of G. dominans and G. jinhaense were found in July, whereas that of G. moestrupii was found in March. The abundances of G. dominans and G. jinhaense, but not G. moestrupii, were positively correlated with water temperature. Therefore, the spatial-temporal distributions of G. dominans and G. jinhaense were closer than those of G. moestrupii and G. dominans or G. jinhaense. This differs from results based on the relative differences in ribosomal DNA sequences and the types of edible prey reported in the literature. Thus, the variations in spatial-temporal distributions and prey species of these three Gyrodinium species suggest that they may have different ecological niches in Korean coastal waters.

• 해양환경안전학회지
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• 제27권1호
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• pp.81-87
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• 2021

제주해역은 많은 상선 및 어선들이 항해를 하고, 자망, 트롤 등 다양한 어구를 활용하여 어로활동을 하고 있다. 그 동안 해양폐기물 수집은 주로 제주도 해안 및 연안해역에서 시행되고 있으나, 연근해 해역에서 발생되는 해양폐기물 발생에 대한 수집 및 연구가 미미하였다. 이에 본 연구는 제주대학교 실습선을 이용하여 제주도 북서해역에 침전한 해양폐기물을 수거하고 각 폐기물별로 관련 선박의 항적을 분석하였다. 또한 일정 구역 및 선박 체류시간별로 얼마나 많은 해양폐기물을 투기하고 있는지 분석하기 위해 선박자동식별장치 항적데이터를 활용하여 대상해역에 선박이 체류한 시간을 추출하여, 어선업종별로 1 ㎢ 단위구역에서 시간당 해양폐기물 발생양을 분석하였다. 분석 결과 연근해 해역은 어선기인 폐어구가 대다수였으며, 그중 자망 및 통발 어구가 많은 비율을 차지하고 있었다. 본 연구에서 단위구역에서 시간당 해양폐기물 발생량은 자망어업이 평균 0.94 kg, 통발어업이 3.49 kg, 저인망어업이 0.10 kg, 연승어업이 0.11 kg, 기타어업이 0.02 kg으로 산출되었다. 이 결과를 활용하여 향후 연근해 수중환경 정화시 해양폐기물 발생이 높은 해역위주로 해양폐기물 수거가 가능할 것이다.

• Journal of the korean society of oceanography
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• 제37권4호
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• pp.201-211
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• 2002

We investigated the abundance and biomass of dinoflagellates and factors controlling their abundance in marine planktonic ecosystems in Korean coastal waters. The abundance of photosynthetic (PDNF) and heterotrophic dinoflagellates (HDNF) was in the range of 0.7${\times}$10$^2$ cells/1-14.0${\times}$10$^6$ cells/1 and in the range of 3.0${\times}$10$^2$ cells/1-6.47${\times}$10$^5$ cells/I, respectively. Their biomass was 0.5${\times}$10$^{-1}$-2.56${\times}$10$^4$ ${\mu}gC/I$ and 2.0${\times}$10$^{-1}$-1.5${\times}$10$^{2}$ ${\mu}gC/I$, respectively. In order to find factors controlling their abundance, stepwise regression and best subsets regression analyses were used. We found that during the summer the most important factors controlling PDNF abundance are DO, P, N and S (abiotic factors), and for HDNF, the abundance of zooplankton, ciliates and HF (biotic factors), and that high turbidity may effect the distribution of dinoflagellate species.

• 한국해양학회지
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• 제16권2호
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• pp.57-98
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• 1981

쌍편모조류는 해양생태계에서 규조류 다음으로 해양 식물플랑크톤의 중요한 구성요인이다. 따라서 쌍편모조류의 분류는 식물플랑크톤을 연구하는데 중요하고도 기본적인 연구과제이다. 우리나라에서 해산쌍편모조류에 관한 기록은 박(1956)이 한국해협에서와 하기 남해안에서의 플랑크톤조성을 연구한 결과 Ceratium속 및 Peridinium속의 몇몇 종이 처음으로 기록되었다. 그 이후에 유(1960)에 의해서 용호만에서 이매패인 불통의 식이 연구결과 Dinophysis sp.와 Prorocentrum sp.의 기록을 남겼으며 박 김(1967)에 의해 진해만에서 Gymnodinium sp.와 Noctiluca sp.가 기록되었는데 이때 기록된 Gymnodinium lumura가 Gymnodiniales로서는 지금까지 우리나라에서 기록된 유일한 것이다. 최(1967)는 한국연안수역에서 Pyrophacus sp.를 관찰하였고 김 조(1969)는 금강하구에서 Glenodinium foliaceum을 기록했다. 마지막으로 심 이(1979)에 의해서 천수만에서 Gonyaulax polygramma와 Gonyaulax Polyedra가 기록되었다.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2004년도 학술대회지
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• pp.279-284
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• 2004

Red tide(harmful algae) in the Korean Coastal Waters has a given a great damage to the fishery every year. However, the aim of our study understands the influence of meteorological factors (air and water tempaerature, precipitation, sunshine, solar radiation, winds) relating to the mechanism of red tide occurrence and monitors red tide by satellite remote sensing, and analyzes the potential area for red tide occurrence by GIS. The meteorological factors have directly influenced on red tide formation. Thus, We want to predict and apply to red tide formation from statistical analyses on the relationships between red tide formation and meteorological factors. In future, it should be realized the near real time monitoring for red tide by the development of remote sensing technique and the construction of integrated model by the red tide information management system (the data base of red tide - meteorological informations).

• 한국어류학회지
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• 제4권1호
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• pp.87-95
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• 1992

삼천포 신수도 연안에 분포하는 치어군집(稚魚群集)의 일변동(日變動)을 파악하기 위해 1986년 12월, 1987년 1월, 7월 및 8월에 RN 80net를 사용하여 1일 4회(回) 채집하였다. 조사 기간 동안 24과(科) 32종(種)이 채집되었다. 개체수에 있어서 우점종은 베도라치, 문절망둑 및 동갈양태속에 속하는 한 종(種)이었으며, 이들 3종(種)은 총 개체수의 55.3%를 차지하였다. 낮과 밤간에 류사도(類似度)는 개체수 보다 생체량이 더 높았다. 개체수와 생체량의 변동은 1월과 5월에 낮과 밤간에 차가 있었으며, 낮 보다 밤에 크게 나타났다. 여명(黎明)이고 저조위(低潮位)일 때 출현하는 치어(稚魚)의 종수(種數)와 개체수가 가장 많았다.

• 수산해양기술연구
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• 제56권3호
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• pp.193-201
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• 2020

The mesh selectivity of a drum shaped pot for finely-striate buccinum (Buccinum striatissimum) was conducted a total of eight times with four different mesh sizes (22, 35, 50 and 60 mm) from May to September, 2019 in the eastern coastal waters of Korea. The size selectivity analysis was estimated by the SELECT method to express logistic selectivity curves. In the results, the catch of finely-striate buccinum was occupied about 90% in the total catch weight. The equation of the master curve of selectivity was estimated to s(R) = exp(-7.778R+9.983)/[1+exp(-7.778R+9.983)]. The relative shell height of 50% selection was 1.284 and the selection range (SR) was 0.282. The optimal mesh size for 50% selection on the minimum maturation size (75 mm, Shell height) was estimated more than 60 mm by the master selectivity curve.

• 수산해양기술연구
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• 제54권1호
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• pp.89-95
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• 2018

The maturation and spawning of black scraper, Thamnaconus modestus were studied using samples collected monthly from March, 2015 to February, 2016 in the coastal waters off Middle East Sea, Korea. The gonadosomatic index (GSI) of female was the highest in June. The spawning periods lasted from March to September based on histological observation of female gonad development. The percentage of sexually mature females estimated from a logistic function was over 50% for the size group 18.02 cm (total length, TL). The size of eggs spawned was between 0.40 to 0.58 mm. Fecundity varied between 185,648 and 9,747,250 eggs. The relationship between the fecundity and TL of the fish was expressed in the fecundity equation as $F=0.0297TL^{5.4835}$.

• 한국수산과학회지
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• 제42권1호
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• pp.73-77
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• 2009

Feeding habits of released Sebastes inermis obtained in daily and monthly collections from August 2007 to December 2007 in coastal waters off Jam Island in Jinhae Bay, Korea were assessed. A total 151 individuals of S. inermis (6.3-9.7 cm TL) were recaptured during the study period. Initial food intake of released S. inermis occurred within three days of released. Stomach content index increased with time, however, the percentage of stomachs devoid of contents decreased. Sebastes inermis mainly consumed gammarid and caprellid amphipods, gastropods and mysids. Diet also included small quantities of bivalves, shrimps, copepods and ostracods. Amphipods were mainly consumed at all size groups and consumption of gastropods, bivalves and shrimps increased with increasing fish size.

• 한국수산과학회지
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• 제42권1호
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• pp.83-88
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• 2009

The purpose of this paper is to obtain the fundamental data on the catch fluctuation in the pound set net according to the tide age from the catch recorded from the year 1997 to 2004 in the coastal waters of Guideok, Jeju. Total catch by the pound set net had a little connection with the tide age. During increasing tide, total catch were reduced slightly from the neap tide to the high tide while there seemed to be a little sign of rise in the total catch until decreasing tide. But in the relation between the catches and the tide age, the level of the correlation coefficient chosen at $p{\le}0.05$ was not significant. Therefore, the catch of the pound set net seemed not to be influenced by the tide age. In addition, CPUE at the high tide was higher than that at the neap tide. When the catch per operating frequency was graded in the order under 50 kg, 50-100 kg and 100-200 kg, the frequency rate by the pound set net was 38%, 19% and 19%, respectively.