• Korean Journal of Fisheries and Aquatic Sciences
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• v.28 no.1
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• pp.1-6
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• 1995

A recording current meter was deployed in the shallow western part of Deukryang Bay from 1 July to 7 August 1992 during which the wind was weak. Principal component in NNE-SSW direction parallel to the axis of the bay had $98.7\%$ of the total variance and the orthogonal component of only $1.3\%$. Spectral analysis of the principal component revealed that the semidiurnal component comprised about $91.2\%$ of total energy. Whereas the diurnal and longer components were less than $2.5\%$ the shallow water tide was about $6.3\%$ . Weak mean current of 0,8cm/sec in SSE direction implies that the slow circulation in the bay is counterclockwise having the northward net flow in the deep eastern part.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.35 no.3
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• pp.207-215
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• 2002

Ocean color properties can be quantified by the relationship between the band ratios of the sensor on the ocean color satellites and the measured field ocean color parameters, A tool to determine the abundance of primary organism using the observed ocean color properties from satellite is presented. Coincident to ocean color satellite passes over the Korean waters, the research vessels were deployed to survey the East Sea, the South Sea and the West Sea around the Korean waters, We have been able to have more than 101) data sets containing coincident in situ chlorophyll a and the estimated chlorophyll a derived from SeaWiFS (Sea-viewing Wide Field-of-view Sensor) from february, 1999 to October, 2001. We were able to develop three proper regional algorithms for the East Sea, the South Sea and the West Sea of the Korean peninsula to estimate chlorophyll a, and set up regional algorithms to quantify the suspended solid in the southern sea of the Korean peninsula, Futhermore we were successful in finding out a simple way of estimating chlorophyll a in the turbid water (Case 2 water) using the relationship between in situ chlorophyll a and the estimated chlorophyll a from the processed level 2 data, using the NASA's global algorithm.

• Proceedings of KOSOMES biannual meeting
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• 2009.06a
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• pp.49-50
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• 2009

본 연구에서는 실시간 어장환경정보시스템 개발을 위하여 기존의 시스템에 대한 문제점을 제시하고, 자료의 효율적굴 관리 및 서비스를 위한 통신방식의 통일과 통합 DB 구축에 초점을 두었다. 또한, 관리자모드에서 전송된 자료를 실시간 확인할 수 있는 모니터링시스템을 구축하여 자료관리의 효율성을 유지하도록 하였다. 현재 본 시스템은 통계 분석된 자료를 제공하고 있으나, 이 부분에 대해서는 지속적인 개발이 요구된다. 또한, 실시간 어장환경정보시스템 웹 서비스를 강화하기 위하여 진행되고 있는 분석 자료는 실시간 30분 간격 자료 이외에 1일, 7일, 15일, 월별 및 연도별에 대한 평균 자료를 제공하고자 한다.

• The Journal of Fisheries Business Administration
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• v.18 no.1
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• pp.59-97
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• 1987

Tuna and tuna fishing extend over most of the tropical waters of the world oceans, especially, this study of the Indian Ocean and the fish and the fishing vessels are highly mobile. No country can deal in isolation with the problems of its tuna fishery and of any tuna fishery in its waters, without collaborating with other countries. This cooperation is often best established through some formal international mechanism. The essential requirements are for information-on the resources, the fishery, the trade-and to identify where management actions are needed to consore the resources or to maintain the economic or social function of the fishery. These will also usually require some form of international mechanism. With the changes in the Law of the Sea, the siuuation in respect of management of tuna-considered among the highly migratory species, requirng special treatment-has also changed. At present there are both uncertainty regarding tuna management and political arguments as to how such management can be best implemented. Bearing this in mind, together with the fact that only few tuna stocks have shown clear evidence of serious depletion through over-exploitation, present emphasis will be placed on information requirements. This study included compiling the data necessary to review the state of stoks in the Indian Ocean tuna fishing grounds. Information on the resources-where the fish are, their quantity, their movements, etc. is important, whether in planning development of new fisheries, or considering the need for collaboration with other countries (in ascertaining to what extent their catches may affect catches of the natoinal fleet) or for conservation measures. A major source of information is the statistics of for conservation measures. A major source of information is the statistics of catch and fishing effort from existing commercial vessels. These need to be assembled for all fisheries on the same stock on an oceanwide basis. The statistical data also need to be analysed and intepreted, and combined with biological data(e.g., on growth, mortality and migration rates) to provide information that is intelligible and useful for administrators and other decision-makers. This must also be undertaken on a resource-wide or ocean-wide basis. Finally, because of the world-wide similarities in the methods of datching, processing and marketing fish, there is a particular tut not exclusive need in those countries just beginning to develop their tuna fisheries-to have ready access to a syntheis of information on tuna, tuna biology and tuna fisheries and tuna fisheries economics and management on the Indian Ocean.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.23 no.1
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• pp.65-67
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• 1990

• Journal of the korean society of oceanography
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• v.39 no.1
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• pp.46-56
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• 2004

Spectral attenuation of light and upwelling radiance were measured in the western coast of Korea on board the R/V Inchon 888 of the Korean National Fisheries Research and Development Institute(NFRDI) during four seasons. The goal of these efforts was to determine the spatial and temporal distribution of the inherent and apparent optical properties of the water, and the factors that control their distribution. Our data indicate that while stratification of the water column, phytoplankton, and wind stress determined the vertical distribution of the optical parameters offshore, it was the tidal current and sediment type that controlled both the vertical and horizontal distribution in the coastal areas. These findings led to the development of a model that estimates the spectral attenuation of light with respect to depth and time for the Yellow Sea. The model integrates water leaving radiance from satellites, sediment types, current vectors, sigma-t, bathymetry, and in situ optical measurements in a learning algorithm capable of extracting optical properties with only knowledge of the environmental conditions of the Yellow Sea. The performance of the model decreases with increase in depth. The mean absolute percentage error (MAPE) of the model is 2% for the upper five meters, 8-10% between 6 and 50 meters, and 15% below 51 meters.

• Journal of the korean society of oceanography
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• v.37 no.2
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• pp.51-57
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• 2002

The ${\Delta}^5$ sterols were measured in be sediments of Jinhae Bay surrounded by industrial cities to assess the sewage-derived contamination. The total concentrations of total sterols ranged from 2.03 to 19.56 ${\mu}g/g$ dry wt. The principal sterol was cholesterol with a contribution of more than 50% to total sterols. Coprostanol, providing an indication of long-term sewage loads, was found in all sediment samples and the concentrations were 0.03-3.86 ${\mu}g/g$ dry wt, accounting for 1-26% to total sterols. The cluster analysis of sampling stations indicated that the sewage-derived contamination was localized in inner Masan Bay.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.23 no.5
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• pp.407-415
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• 1990

We studied the spatio-temporal characteristics of the Ullung Warm Lens (UWL) using the historical oceanographic data of the National Fisheries Research and Development Agency of Korea in the East Sea from 1967 to 1983. The UWL is basically a subsurface phenomenin found in 100 to 300m depths, and its existence is not well posed in the distribution of the sea surface temperature. The UWL has a typical size of 100 km diameter, and its center migrates within the region of 150 by 150 km south of the Ullung Island. The UWL is almost a permanent feature, and the probability of its occurence within our study area ($129\~132^{\circ}E,\;36\~38^{\circ}N)\;was\;86\%$.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.48 no.3
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• pp.368-376
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• 2015

The Feeding habits of larval Liparis tanakae collected from the Nakdong River estuary were studied. L. tanakae [3.8-10.6 mm notochord length(NL)] was a carnivore thatconsumed mainly copepods. Its diet also included small numbers of free-living flatworms (Macrostomida), tintinnids, cladocerans, and polychaetes larvae. To evaluate ontogenetic changes in dietary composition, three size groups were designated: 3-5, 5-7, and >7 mm. Copepods were the most important prey items for all size groups. The smallest size group frequently preyed on polychaete and bivalve larvae, along with copepods. As notochord length increased, the numbers of cladocerans and Macrostomida increased relative to those of polychaete and bivalve larvae.

• Fisheries and Aquatic Sciences
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• v.1 no.1
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• pp.94-112
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• 1998

The present study dealt with cumaceans (Cumacea: Bodotriidae) collected from the Yellow Sea. Specimens were sampled using a van Veen grab m the Yellow Sea and in. Kyonggi Bay surrounding Inchon, Korea. New figures and redescriptions of the four bodotiid cumaceans are presented including Bodotria ovalis Gamo, 1965, Iphinoe tenera Lomakina, 1960, Eocuma cf. hilgendorfi Marcusen, 1894, and Heterocuma sarsi Miers, 1879. They are newly added in the Korean fauna.