• 제목/요약/키워드: Southeast sea of Korea

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A report on the mass summer mortalities of the farmed Pacific oysters, Crassostrea gigas and Bay scallops Argopecten irradians in the local waters of Goseong Bay, Korea

  • Han, Jong Cheol;Jo, Qtae;Park, Young Cheol;Park, Tae Gyu;Lee, Deok Chan;Cho, Kee-Chae
    • 한국패류학회지
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    • 제29권3호
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    • pp.239-244
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    • 2013
  • Mass mortalities of farmed shellfish, mostly in summer season, thus named mass summer mortalities, have been a global issue in shellfish aquaculture. The 2013 mass summer mortalities in the confined waters of Goseong Bay, Goseong, Korea were quite a unique and intensive for two farmed species, the Pacific oysters, Crassostrea gigas, and bay scallops, Argopecten irradians. The mortalities were progressive from the bottom of the suspended oysters and caged scallops in the waters, reaching up to 80% for the oyster and 95% for the scallop in about 20 days after the first occurrence, early August, 2013. We monitored a wide range of environmental factors, including water temperature, dissolved oxygen (DO), salinity, turbidity, acidity (pH), organic and inorganic matters, chemical oxygen demand (COD), suspected pathogenic agent, and phytoplankton composition throughout the water column where the two species were suspended or caged. Our survey concluded that the hypoxia or anoxia might be a major cause of the mortalities. Here, we detailed the mortalities and ways to arrive at the conclusion.

Seasonal variation of physicochemical factor and fecal pollution in the Hansan-Geojeman area, Korea

  • Park, Young Cheol;Kim, Poong Ho;Jung, Yeoun Joong;Lee, Ka Jeong;Kim, Min Seon;Go, Kyeong Ri;Park, Sang Gi;Kwon, Soon Jae;Yang, Ji Hye;Mok, Jong Soo
    • Fisheries and Aquatic Sciences
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    • 제19권4호
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    • pp.17.1-17.9
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    • 2016
  • The seasonal variation of fecal coliforms (FCs) and physicochemical factors was determined in seawaters of the Hansan-Geojeman area, including a designated area for oyster, and in inland pollution sources of its drainage basin. The mean daily loads of FCs in inland pollution sources ranged from $1.2{\times}10^9$ to $3.1{\times}10^{11}$ most probable number (MPN)/day; however, the pollutants could not be reached at the designated area. FC concentrations of seawaters were closely related to season, rainfall, and inland contaminants, however, within the regulation limit of various countries for shellfish. The highest concentrations for chemical oxygen demand (COD) and $chlorophyll-{\alpha}$ in seawaters were shown in the surface layer during August with high rainfall, whereas the lowest for dissolved oxygen (DO) in the bottom layer of the same month. Therefore, it indicates that the concentrations of FC, COD, DO, and $chlorophyll-{\alpha}$ of seawaters were closely related to season and rainfall.

창선 해역의 지중해담치(Mytilus galloprovincialis) 양식장 및 육상오염원에서 분리한 대장균(Escherichia coli)의 항생제 내성 (Antimicrobial Resistance of Escherichia coli Isolates from Mussel Mytilus galloprovincialis Farms and Inland Pollution Sources in the Changseon Area, Korea)

  • 권순재;이가정;정연중;박상기;고경리;양지혜;목종수
    • 한국수산과학회지
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    • 제49권5호
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    • pp.564-572
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    • 2016
  • In this study, we isolated and characterized Escherichia coli from mussels and inland pollution sources in or in proximity to the Changseon area on the southern coast of Korea in 2014. A total of 147 strains of E. coli were isolated from 54 mussels and 32 pollution-source samples. The susceptibility of the isolates to 24 antimicrobial agents was analyzed. The resistance of E. coli isolates to rifampin was highest at 100%, followed by cephalothin (98.6%), tetracycline (91.8%), amikacin (81.0%), ampicillin (79.6%), cefazolin (79.6%), streptomycin (73.5%), piperacillin (70.7%), gentamicin (37.4%), cefoxitin (35.4%), cefamandole (34.7%), tobramycin (29.9%), amoxicillin/clavulanic acid (24.5%), nalidixic acid (21.8%), trimethoprim (19.0%), chloramphenicol (17.7%), cefotaxime (12.9%), trimethoprim (10.9%), ceftazidime (10.2%), aztreonam (7.5%), imipenem (2.7%), cefepime (2.0%), and cefotetan (0.0%). In addition, the antimicrobial resistance of E. coli isolates from inland pollution sources was slightly greater than or similar to that of isolates from mussels.

New Records of Three Sergestid Shrimps (Crustacea: Decapoda: Penaeidea) from the Korean Waters of the Yellow Sea

  • Kim, Jung Nyun;Choi, Jung Hwa;Lee, Jeong-Hoon;Kim, Joo Il
    • Fisheries and Aquatic Sciences
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    • 제16권3호
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    • pp.199-205
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    • 2013
  • Three species of pelagic sergestid shrimps, Deosergestes seminudus (Hansen, 1919), Sergia lucens (Hansen, 1922) and S. talismani (Barnard, 1947), were identified based on collections by the National Fisheries Research and Development Institute from the Korean coast of the Yellow Sea between 2003 and 2011. They are herein reported for the first time from the Yellow Sea. Morphological descriptions and illustrations with color photographs of all species are also given. With the addition of these species, the family Sergestidae in the Korean waters now comprises five species belonging to three genera. Finally, a key to the Korean genus and species of the family Sergestidae is presented.

Heterogeneous growth of the triploid Pacific oysters Crassostrea gigas created by chemical inhibition of polar body release

  • Jo, Qtae;Han, Jong-Chul;Hur, Yong-Baek;Byun, Soon Kyu;Moon, Tae-Seok
    • 한국패류학회지
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    • 제30권4호
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    • pp.443-447
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    • 2014
  • Triploids have several potential advantages over diploids in aquaculture, drawing an elevated commercial reaction into the realistic application of the techniques despite we are still in the early stage of triploid industry for the Pacific oysters Crassostrea gigas. We traced the growth performance of the triploid C. gigas for over a year from hatchery spats, which was created by manipulations of chemicals (Cytochalasin B, CB or 6-Dimethylaminopurine, 6-DMAP). The growth was clearly marked by an initial longer dormancy and following a great magnitude of heterogeneity. The dormancy was almost 9 to 10-month long or even longer and was considered as a downside of the creation. The heterogeneity was magnified by appearance of extraordinarily growing oysters in part during summer season, which could be a representative upside of the triploids. Overall, however, the results were not as positive as were expected. The longer dormancy and following heterogeneity observed in our practice could be marked as an additional negative sign of the chemical use. The present study, thus, might be highly indicative in the introduction of biological cross between tetraploid and diploid to produce natural triploid embryos.

자란만사량도 해역의 굴(Crassostrea gigas) 및 육상오염원에서 분리한 대장균(Escherichia coli)의 항생제 내성 (Antimicrobial Resistance of Escherichia coli Isolated from Oysters Crassostrea gigas and Major Inland Pollution Sources in the Jaranman-Saryangdo Area in Korea)

  • 권지영;권순재;양지혜;목종수;정상현;하광수;이희정;정연중
    • 한국수산과학회지
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    • 제52권6호
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    • pp.605-616
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    • 2019
  • This study evaluated the abundance and antimicrobial resistance of Escherichia coli in oysters Crassostrea gigas and major inland pollution sources sampled in 2014-2015 from Jaranman-Saryangdo on the southern coast of Korea. The ranges of the geometric mean of E. coli concentrations in oysters and major inland pollution sources were <20-29.8 MPN/100 g and 7.5-137.2 MPN/100 g, respectively. We isolated 247 strains of E. coli (28 from oysters and 247 from major inland pollution sources) and examined the antimicrobial resistance patterns of all isolates. Isolates from both sources were highly resistant to rifampin (99.5-100%) and cephalothin (70.8-78.6%). The resistance rate was higher in E. coli isolated from oysters those from inland pollution sources. Multiple resistance against at least four antimicrobials was observed in 85.7% and 21.0% of the oyster and major inland pollution sources isolates, respectively.

통영 도산·풍화 해역 내 하수처리장 배출수가 패류생산해역에 미치는 영향 평가 (Assessment of the Impact of Wastewater Treatment Plant Effluents on Shellfish Harvesting Areas in the Dosan-Poonghwa Sea Area of Tongyeong)

  • 신혜영;조성래;이장원;김지훈;박큰바위;윤민철
    • 한국수산과학회지
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    • 제57권4호
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    • pp.438-447
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    • 2024
  • Tongyeong is an important shellfish harvesting area, that hosts the largest designated sea area for shellfish exports in South Korea. In particular, the Dosan-Poonghwa Sea Area in Tongyeong is a semi-enclosed bay with poor water circulation and significant pollution due to its proximity to urban areas. This study examined the distribution of fecal pollution indicators (total coliforms, fecal coliforms, male-specific coliphages, and norovirus G1/G2) in the influent and effluent of wastewater treatment plants (WWTP). This study assessed the impact of the effluent discharge on shellfish harvesting areas in the Dosan-Poonghwa Sea Area to better safeguard shellfish farms and guarantee the safety of harvested shellfish. A strong positive correlation was observed between total and fecal coliforms in both influent (r=0.974, P<0.01) and effluent (r=0.779, P<0.05), with no other significant correlations observed. The impacts of the effluent was evaluated according to NSSP guidelines. The volume of seawater required to dilute the effluent discharged per day was calculated. This evaluation indicated that surrounding aquaculture areas were not impacted, and no viruses were detected in oysters collected from the Dosan-Pungwha Sea Area.

동계 진해만에서의 자어 분포 및 종조성 (Distribution and Species Composition of Larval Fish during Winter Season in Jinhae Bay, Korea)

  • 이정훈;김정년;남기문;김창원;김주일
    • 한국어류학회지
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    • 제26권2호
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    • pp.133-138
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    • 2014
  • 진해만에서 동계기간 동안 자어의 분포 및 종조성에 관하여 조사하였다. 조사기간 동안 8과 12종이 출현하였고, 우점종으로는 Pholis crassispina, Clupea pallasii, Liparis tanakae, Hexagrammos otakii였다. 이들 4종은 출현한 총 개체수의 93%를 차지하였다. 잠도와 칠천도 동쪽에서 높은 밀도와 종 다양성을 보여, 이 지역이 진해만에서 자어의 주요 산란장인 것을 의미한다.

The Prison and the Sea

  • Mrazek, Jan
    • 수완나부미
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    • 제11권1호
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    • pp.7-40
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    • 2019
  • The essay reflects on the work of Adrian Lapian (1929-2011), an Indonesian scholar of archipelagic/maritime Southeast Asia and its "sea people-sea pirates-sea kings." The essay suggests that Lapian's writing mirrors navigation at sea, and the constant re-orientation and ever-changing, multiple points of view that are part of it. This is contrasted to Foucault's "panopticism" and academic desire for discipline. Taking cue from Lapian's writing and from the present author's experience of seafaring, the essay envisions Southeast Asian studies as a fluid, precarious, disorienting, even nauseating multiplicity of experiences, dialogues, and moving, unstable, and uncertain points of view; a style of learning that is less (neo)colonial, more humble, and closer to experiences in the region, than super-scholarship that imposes universalizing, panoptic standards, theories and methods (typically self-styled as "new") that reduce the particular into a specimen of the general, a cell in the Panopticon. The essay concludes with reflections on certain learning initiatives/traditions at the National University of Singapore, including seafaring voyages-experiences, encounters, and conversations that make students and scholars alike to move and see differently, to be touched, blown away, rocked, swayed, disoriented, swallowed, transformed, and feel anew their places, roots, bonds, distances, fears, blindness, powerlessness.

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Temporal changes in the abundance of the fish-killing dinoflagellate Karlodinium veneficum (Dinophyceae) in Tongyeong, Korea

  • Park, Tae-Gyu;Ok, Yu-Ran;Park, Young-Tae;Lee, Chang-Kyu
    • ALGAE
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    • 제26권3호
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    • pp.237-241
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    • 2011
  • The toxic dinoflagellate Karlodinium veneficum has been implicated in numerous fish kill events around the world. Since this species commonly co-occurs with other morphologically similar dinoflagellates, field monitoring of this species in natural waters via light microscopy only has been problematic. In this study, we investigated temporal changes in K. veneficum's abundance in the waters of Obido, Tongyeong, using a species-specific real-time polymerase chain reaction (PCR) assay. The field survey, from April to December 2010, revealed K. veneficum occurred at low densities (12 to 425 cells $L^{-1}$) during this time and that cell numbers peaked in June (early summer in Korea), indicating this species generally occurs in the warmer season (mostly at $16.9-22.3^{\circ}C$ and 33.4-34.5‰) in the Obido area.