• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2003.05a
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• pp.365-366
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• 2003

주꾸미는 서해 연안 어족의 자원감소와 함께 어장 환경 악화에 의해 매년 생산량이 감소되고 있으며, 금후에는 양적 성장이 어려울 뿐만 아니라 어업인의 소득 감소가 예상되고 있다. 따라서 주꾸미의 생산량을 지속적이고 안정적으로 유지하기 위해서는 지금까지의 어선ㆍ어업에서 탈피하여 주꾸미의 인공 종묘생산 및 자원조성을 위한 종묘의 대량 방류가 필요하다. 주꾸미 종묘생산시 시료의 무게 측정, 표지작업, 인공채란, 수송 그리고 질병치료 등을 위해 주꾸미 유생을 그물망으로 포획하는 것은 유생에 물리적 손상과 스트레스를 주어 폐사의 1차 원인이 되기도 한다. (중략)

• Analytical Science and Technology
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• v.23 no.5
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• pp.477-484
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• 2010

Personal care products are a diverse group of synthetic organic chemicals such as antimicrobial compounds, UV filters and organo-phosphate flame retardants and derived from individual usages of soaps, toothpaste and cosmetics. It has been detected in municipal sewage effluent and various environmental samples such as surface water, marine, soil, sediment and aquatic biota in many countries. The occurrence of personal care products in environmental samples could negatively impact the health of the ecosystem and humans, due to persistent, long-term chronic exposure of aquatic organisms. In this study, fifteen personal care products in aquatic environmental samples were determined by gas chromatography-mass spectrometry (GC-MS) with liquidliquid extraction (LLE). Method detection limits were in the range of $0.004\sim0.273\;{\mu}g/L$. Two compounds (TCEP, TCPP) were detected in surface waters and seven compounds (triclosan, 4-MBC, EHMC, BP-3, TCEP, TPP, TBEP) were detected in sewage treatment plants (STP) influents or effluents.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.25 no.4
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• pp.97-105
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• 2020

The genus Navicula, with its notably high species diversity, is one of the most important genera of the diatom assemblages of the tidal flats. In the present study, Navicula spartinetensis was firstly observed from Yellow Sea including both of Korean and Chinese tidal flats. Morphological description was also made based on the LM and SEM observation. Samples were collected from four locations in Korea, two in October 2006, one in July 2007, and one in July 2018, and seven location in China from June to July 2018. N. spartinetensis was firstly described by Sullvian & Reimer in 1975; Cells are lanceolate with narrow valve faces, 20-30 ㎛ long, 5-6 ㎛ wide, and the density of striae is 12-13 in 10 ㎛, and the terminal raphe ending curved in the same direction. N. spartinetensis has been previously reported from Europe and South America, and the present study has expanded its distribution to the Northeast Asia. In conclusion, the diversity of Korean marine benthic diatoms is still underestimated thus extensive further study of diatom taxonomy is needed.

• Journal of the Korean Society of Marine Environment & Safety
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• v.29 no.1
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• pp.36-43
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• 2023

To establish a culture system with enhanced cellular nutrition, we investigated the effects of light quality (blue, 450 nm; yellow, 590 nm; and red, 630 nm) of a light-emitting diode (LED) on the biochemical composition of Tetraselmis suecica and T. tetrathele. The protein content of both species was higher (42-69%) than the content of other biochemical substances under all wavelengths. Carbohydrate, protein, and lipid contents were higher under the yellow wavelength, which showed a low growth rate, than those under other wavelengths. The contents of all biochemical substances were low under the red wavelength, which showed a high growth rate. These results indicated that protein synthesis occurs in response to decreased cell division rate, while lipid and carbohydrate synthesis occurs owing to altered chemical composition and enzymatic activity. Therefore, we suggested a two-phase LED culture system, which emitted red LED during the early-middle exponential phase and yellow LED during the late exponential and stationary phases, to increase the yield of useful biochemical substances of T. suecica and T. tetrathele.

• Environmental Analysis Health and Toxicology
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• v.18 no.4
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• pp.277-285
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• 2003

연안의 방조제 건설은 하천수와 바다물의 교환을 인위적으로 차단하고, 방조제 내부에는 호수를 형성하게 된다. 이렇게 형성된 인공호수의 수질은 호수로 유입되는 하천의 수질에 크게 영향을 받을 수 있으며, 인공호수의 수질이 악화되면 인근 해양생태계에 영향을 미칠 수 있다. 본 연구는 인공호수의 물이 바다로 방류될 때 해양생태계에 어떠한 영향을 미칠 것인지를 예측하고자 수행되었다. 방조제 건설로 이미 형성되어 있는 시화호, 아산호, 부사호와, 현재 건설중인 새만금 방조제로 인하여 형성될 호수의 유입 하천인 만경강에서 표층수를 채수하여 둥근성게(Strongylocentrotus nudus)의 정자와 수정란을 이용한 생물 검정을 실시하였다. 담수호의 수질을 해양생물을 이용하여 평가할 수 있도록 하기 위하여 시료의 염분을 조절하면서 실험을 실시하였다. 정자를 이용한 수정 실험 결과, 시화호에서는 수정률에 영향을 미치지 않았고, 아산호와 부사호에서는 약간의 영향이 있었으나 그 정도는 미약하였다. 반면, 만경강의 경우 수정률의 저해가 상당히 크게 나타났다. 수정란을 이용한 발생 실험 결과, 시화호, 아산호, 부사호에서는 약간의 영향이 나타난 반면, 만경강의 경우는 매우 큰 영향이 나타났다. 이들 실험 결과를 종합하면, 시화호, 아산호, 부사호의 수질은 대체로 양호하나, 만경강의 수질은 크게 우려되는 수준이었다. 따라서, 앞으로 건설될 새만금 호수와 인근 해양생태계를 보전하기 위해서는 만경강의 수질 개선을 위한 대책이 마련되어야 할 것이다.

• Journal of the Korean Society of Marine Environment & Safety
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• v.21 no.1
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• pp.9-17
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• 2015

In order to elucidate the current state of marine pollution of heavy metals around major shipyards in Korea, seawater samples were collected at eleven sampling stations and four control stations around 4 major shipyards located in the southeastern coast of Korea in summer 2010, and 6 kinds of metals such as copper(Cu), zinc(Zn), iron(Fe), cadmium(Cd), lead(Pb) and mercury(Hg) in seawater samples were analyzed. The analyses of heavy metals in seawater showed that the mean Cu concentrations in seawater around 4 major shipyards were in the range of $0.817{\sim}1.638{\mu}g/L$ which were lower than Korean environmental standards of $20{\mu}g/L$ for the protection of human health(PHH) and of $3{\mu}g/L$ for short-term protection of marine ecosystem(SPME) but higher than Cu concentration at control station by a factor of up to 2.75. The mean Zn concentrations were in the range of $0.228{\sim}0.567{\mu}g/L$ which were lower than Korean environmental standards of $100{\mu}g/L$ for PHH and $34{\mu}g/L$ for SPME but higher than Zn concentration at control station by a factor of up to 5.91. The mean Fe concentrations were in the range of $3.332{\sim}7.410{\mu}g/L$ which were higher than Fe concentration at control station by a factor of up to 6.75. The mean Cd concentrations were in the range of $0.013{\sim}0.028{\mu}g/L$ which were lower than Korean environmental standards of $10{\mu}g/L$ for PHH and $19{\mu}g/L$ for SPME but higher than Cd concentration at control station by a factor of up to 2.33. The mean Pb concentrations were in the range of $0.007{\sim}0.126{\mu}g/L$ which were lower than Korean environmental standards of $50{\mu}g/L$ for PHH and $7.6{\mu}g/L$ for SPME. The mean Hg concentrations were in the range of $0.002{\sim}0.004{\mu}g/L$ which were lower than Korean environmental standards of $0.5{\mu}g/L$ for PHH and $1.8{\mu}g/L$ for SPME. Although the concentrations of metals such as Cu, Zn and Fe which were used in shipbuilding works were lower than Korean environmental standards for PHH and SPME, the fact that the concentrations of Cu, Zn and Fe at sampling stations around major shipyards were higher than those at control stations implies that the works in shipyards had some effects on marine water quality around shipyards. Therefore, marine environment management such as the prevention and control of the discharge of various pollutants from shipyards is required on national level.

• Journal of the Korean Society for Marine Environment & Energy
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• v.9 no.3
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• pp.176-186
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• 2006

Distribution characteristics of organophosphorous pesticides(OPs) in water and suspended particles were studied in Asan Bay, Korea, from June 2004 to October 2005. 28 organophosphorous pesticides could be detected in Asan Bay during this study. The most commonly and abundantly measured OPs in the surface waters were IBP (max=$6,343.7ng\;l^{-1}$). DDVP, diazionon, ethoprophos and methidathion were also observed at relatively high concentrations. Their maximum concentrations exceeded $100ng\;l^{-1}$ in almost every month. Malathion, mevinphos, ph orate and chlorfenvinphos were also detected at relatively high concentrations. Many OPs more frequently appeared in summer than in winter due to the intensive application of pesticides in summer months. The concentration of OPs generally decreased with increasing distance from the mouth of Asan Bay. This result implies progressive dilution of these pesticides in the marine environment. Measured concentrations of diazinon were well below $20,000ng\;l^{-1}$ which is a limit set by the seawater quality standard of Korea. The concentrations of malathion and parathion in the surface waters of Asan Bay did not exceed the seawater quality standard of Korea($250,000\;and\;60,000ng\;l^{-1}$ respectively). OPs adsorbed on suspended particles were also studied. DDVP, phorate, stirofos, EPN, azinphos-methyl and IBP had higher adsorption capacity onto suspended particles than other pesticides. Calculated pesticide-particle adsorption coefficient($K_d-particle$) for samples collected in Asan Bay were closely related to the reported pesticides-soil adsorption coefficient ($K_d-soil$).

• Journal of the Korean Society for Marine Environment & Energy
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• v.9 no.4
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• pp.187-192
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• 2006

In order to know the biological effect of effluent from shipyard and the adjacent stream water on four organisms (flatfish, rockfish, sea squirt and arkshell) cultured around the shipyard, lethal rate and DNA damage were measured after 48 hr exposure and carried out by a single cell gel electrophoresis, namely comet assay. $LC_{50}$ (48 hr) could not be calculated in any organism 48 hours after exposure to effluent from shipyard and stream water, because all organism showed a lethal rate lower than 20%. Regardless of no acute toxicity, DNA damage of flatfish and rockfish was detected higher in Jang-Pyoung stream than in control, whereas sea squirt revealed higher DNA damage in laundry waste water. From these results, Jang-Pyoung stream seemed to have a relatively higher genotoxicity rather than effluent from shipyard.

• Journal of the Korean Society for Marine Environment & Energy
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• v.13 no.1
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• pp.68-74
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• 2010

Octopus(Octopus minor), benthic cephalopod, were collected from intertidal zone in Seosan, Choongnam and analyzed for polybrominted diphenyl ethers(PBDEs). PBDEs concentrations ranged from 29 to 109 ng/g lipid wt(mean; 54 ng/g) in mantle and from 12 to 89 ng/g lipid wt(mean; 48 ng/g) in internal organ. PBDEs concentrations in octopus internal organ were lower about two times than that in common squid collected in Yellow Sea, indicating Seosan is relatively less contaminated with PBDEs. Major congener was BDE 206, occupying 72% and 49% of total PBDE concentration in mantle and in internal organ, respectively, which is very different from PBDE composition in common squid with major congeners of BDE 47 and 99. From PBDE composition, octopus seemed to concentrate higher brominated BDE rather than lower brominated BDE. This PBDE composition in octopus may be affected by sediment with extremely high contribution of deca-BDE to total PBDE concentration.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.12 no.3
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• pp.244-250
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• 2007

Membrane inlet mass spectrometer (MIMS) has been used to accurately quantify dissolved gases in liquid samples. In this study, the MIMS system was applied to measure dissolved methane in seawater and sediment porewater. To evaluate the accuracy of the measurement, liquid samples saturated with different methane partial pressure were prepared and the methane concentrations were quantified with the MIMS system. The measured values correspond well with the expected values calculated from solubility constants. The standard error of the measurements were $0.13{\sim}0.9%$ of the mean values. The distribution of dissolved methane concentration in seawater of the South Sea of Korea revealed that the physical parameters primarily control the methane concentration in sea water. The MIMS system was effective to resolve the small dissolved methane difference among water masses. The probe type inlet in MIMS system was proven to be effective to measure porewater methane concentration.