• Title/Summary/Keyword: West sea

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Size selectivity of gill net for female snow crab, Chionoecetes opilio (자망에 대한 대게 암컷의 망목 선택성)

  • Park, Chang-Doo;An, Heui-Chun;Cho, Sam-Kwang;Bae, Bong-Seong;Park, Hae-Hoon;Bae, Jae-Hyun;Kim, Hyun-Young
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.45 no.2
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    • pp.122-127
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    • 2009
  • A series of fishing experiments was carried out in the eastern coastal waters of Korea from January, 2002 to March, 2003, using gill nets of different mesh sizes (m 180, 210, 240, 270 and 300 mm) to determine the size selectivity of gill net for female snow crab, Chionoecetes opilio. The catch of experimental gears was mostly snow crab (97%), Chionoecetes opilio. The maximum carapace length (RL) of each female snow crab caught in the fishing experiments was measured. The master selection curve was estimated by applying the extended Kitahara s method. The selection curve showed that the gill nets of larger mesh size allowed more female crabs of small carapace size to escape. The optimum values of RL/m for 1.0 of retention probability was 0.563 and RL/m was estimated to be 0.249, 0.290, 0.319, 0.344 and 0.367 when the retention probability were 0.1, 0.2, 0.3, 0.4 and 0.5, respectively.

Physiological and Histological Characteristics of Starry Flounder Platichthys stellatus after Starvation and Re-feeding (절식 후 먹이 재 공급시 강도다리P(latichthys stellatus)의 생리·조직학적 특성)

  • Kim, Su Kyoung;Shim, Na Young;Jang, In Kwon;Lee, Chu;Kim, Yong Dae;Kim, Bung Ki;Kim, Jae Won
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.46 no.6
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    • pp.793-800
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    • 2013
  • This study was conducted to determine the physiological and histological characteristics of starry flounder Platichthys stellatus juveniles to undergo a short/long starvation period and subsequent re-feeding with 2 weeks interval for 65 days. All findings from this study indicate the possibility of a very rapid recovery possibility of starry flounder after short starvation period for 2 or 4 weeks. The mean body weight after 2 and 4 weeks starvation were not significantly different after 65 days. However, the body weight of 6 and 8 weeks starved fishes showed significantly low value than 2 weeks starved fishes. All biomarkers, liver somatic index, RNA/DNA ratio and blood chemistry, in this study showed fast recovery possibility after re-feeding of starry flounder. During the starvation and recovery process, they showed distinct increasing and decreasing tendency. From 21-28 days after re-feeding, most biomarkers reached to their maximum value and thereafter decreased again in 2, 4 and 6 weeks starvation and re-feeding groups. It could be interpreted as a compensatory growth and strategical action against starvation.

A Study on the Inflow and Seasonal Characteristics of Foreign Marine Debris in the Coastal Area of the West Sea (서해안 일대 외국기인 해양쓰레기의 유입과 계절적 특성 연구)

  • Jang, Seon-Woong;Park, Jae-Moon;Chung, Yong-Hyun;Kim, Dae-Hyun;Yoon, Hong-Jo
    • Journal of the Korean Society for Marine Environment & Energy
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    • v.15 no.2
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    • pp.89-100
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    • 2012
  • The aim of this study knows to occurrence characteristics and monthly transition of foreign marine debris by changing in the marine environment for the national marine debris monitoring areas in the west coastal area. The Jeju Island (5,112) had the highest number for foreign marine debris flowed in the coast. Many areas in the next were surveyed by Hajo Island (1,967), Imja Island (507). Plastic bottles were the most common type to 2,925 piece of the whole collection. Then, the monthly occurrence amount was concentrated in July, September. At this time, analysis results of the marine environment are as follows: The sea surface wind of southerly or southeasterly were predominated. In addition, the sea surface circulations were dominated by inflow of seawater southward along the China Coast and northward from the East China Sea.

A Study on the Transition Process of Fisheries Industry, Fisheries Institute of West Coast of Korea (Around the Gogunsan Islands and adjacent Area) (우리 나라 서해안(西海岸)의 수산업(水產業) 및 수산교육기관(水產敎育機關)의 변천과정(變遷過程)에 관한 사적(史的) 고찰(考察) (고군산(古群山) 군도(群島)의 인접지역(隣接地域)을 중심(中心)으로))

  • Lee, Kil-Rae
    • Journal of Fisheries and Marine Sciences Education
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    • v.11 no.1
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    • pp.24-42
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    • 1999
  • I have studied historical transition process of fisheries industries, fisheries Institute in abreast of developing fisheries industries of west coast of Korea since 1910 year with regard to the Gogunsan Is. The results were summarized as follows. In 1910 year, fishery industry has been carried out shifting fishing gear e.g set-net in shallow waters, small stow net, small seine net adapting to the tophorgrapical feature, shape of coast, oceanic condition, however, the fishing gear and fishing method were undeveloped, so that, Japanese fishermen had been exploited fisheries resources penetrating the fishing ground. Most important species were lot of captured croaker, cod, spanish mackeral, sea abream, herring in coastal sea. nowaday, squid, anchovy, shrimp, crab, pompret were much captured. The species were captured in 18 century were not captured. It is rarely than that period. Fishereis aquatic culture had been not farmed till 1960 year, but sea laver, shrimp, crab, had been breeded 1970 year also, the fresh water fish e.g. eel, cat-fish had been breeded activately. The fisheries processing industry were composed of salt. icing, dry, method. the salted fish industry had been prevailed at Gangyng, Kwangchon, Kunsan, Julpo comparatively. The fisheries institute had been established at Kunsan at first, but institute established in other region had been abolished in a short time. This phenomenon was related with development of fisheries resources. The western coast fisheries industries had been wasted of decreasing of fisheries resources, variation of environment. Accordingly, the study of preserving the marine resources. educated man power who engaged in fisheries field have to accomplish. Sea was dying with reason of loss of mud in west coast factory waste, waste of life the increase of accident of sea polluted, each illegal fishing industry physical and chemical reason etc. in this respect, Kusan maritime college, fisheries developing agency, institute have to take important role for developing fishing industry.

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Shallow Water Waves around Tokdo (독도 인근해역에서의 천해파)

  • 황연호;전인식;오병철;심재설
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2001.10a
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    • pp.117-121
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    • 2001
  • For the effective development or preservation of Tokdo, the natural environments in the ambient sea area should be well investigated. The wave deformations and wave breaking in the vicinity have much affected the bottom morphology of Tokdo as well as its ecological environment. The present study investigates the wave deformations and wave breaking through a numerical model. The final goal is to provide the fundamental wave data for the effective development or preservation of Tokdo in future. The extended mild slope equation was applied to Tokdo sea area for three different deep water wave conditions (S, SSE, NNE directions). The results showed that for the S and SSE directions the wave heights in the area between the east island and the west island were very low with the level of 1~2m, but for the NNE direction they appeared pretty high with 3~4m, In the sea area near the northwest of west island, the wave heights were low to be 1~3m for all three directions of deep water wave.

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Relationships between the Winter-Time Surface Water Temperature and the Summer-Time Bottom Water Temperature in the West Sea of Korea (서해의 겨울철 표면수온과 여름철 저층수온과의 관계)

  • 강용균;김호균
    • 한국해양학회지
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    • v.22 no.4
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    • pp.228-235
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    • 1987
  • Based on the hydrographic data for 19 years (1968-1984) at 65 stations in the West Sea of Korea, we investigate the relationships between the sea surface temperature (SST) in winter and the bottom water temperature (BWT) in summer. The spatially-averaged anomalies of BBT are highly correlated with those of SST during the preceding winter. However, due to advection of heat by ocean currents, the spatial pattern of BWT anomaly in summer does not closely resemble that of SST anomaly in the preceding winter.

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Discovery of Halicyclops continentalis (Cyclopidae, Halicyclopinae) from Estuaries and Salt Marshes on the West Coast of South Korea

  • Cheon, Young-Chang
    • Animal Systematics, Evolution and Diversity
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    • v.28 no.1
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    • pp.12-19
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    • 2012
  • A cyclopoid species from several salt marshes and estuaries on the west coast of South Korea were identified as Halicyclops continentalis Ueda and Nagai, 2009, recently described from Ariake Bay at northwestern Kyushu, Japan. Detailed examination on the Korean specimens justifies Ueda and Nagai's proposition that the H. sinensis sensu Tai and Chen, 1979 formerly known from the Chinese coast of the Yellow Sea should be identical to H. continentalis. Furthermore, this report reinforces their assumption on the geographical distribution of H. continentalis, that is, the Ariake Bay population is a continental relict of the East Asia continent. Herein, a redescription of the species is provided on the basis of the Korean specimens, with a comment on the morphological comparison among three populations around the Yellow Sea.

Effect of Probiotics on Water Quality in the Shrimp (Fenneropenaeus chinensis) Ponds (대하 (Fenneropenaeus chinensis) 양식장 사육수에 미치는 Probiotics의 효과)

  • LIM Hyun Jeong;PARK Joong Hyun;JANG In Kwon
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.37 no.2
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    • pp.91-97
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    • 2004
  • Applications of probiotics to shrimp ponds were carried out to determine their effects on water quality. Fermented solutions consisting of Bacillus spp. and Nitrosomonas spp. were applied to a 4 ha shrimp (Fenneropenaeus chinensis) pond from July to September, 2000. In the pond treated with probiotics, daily variations of DO and pH, and concentrations of DIN and DIP were lower than those in the ponds without probiotic treatment. Concentration of phytoplankton was less variable and the number of species was more variable in the probiotic-treated pond than those in the control pond. Variation of bacterial numbers and the number of Vibrio spp. were lower in the treated pond than those in the control pond. It is confirmed that the probiotics can be used to improve water quality of the shrimp ponds.

New Record of the Chinamanfish, Symphorus nematophorus (Perciformes: Lutjanidae) from Korea (한국산 퉁돔과 어류 1미기록종, Symphorus nematophorus)

  • Kim, Maeng Jin;Mun, Tae Seok;Lee, Jeong-Hoon;Choi, Young Min;Song, Choon Bok
    • Korean Journal of Ichthyology
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    • v.27 no.2
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    • pp.149-152
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    • 2015
  • A single specimen of Symphorus nematophorus (481.0 mm in SL), belonging to the family Lutjanidae, was firstly collected by a set net in the coastal waters of Geojae Island, located in south sea of Korea on August 1, 2014. This specimen was characterized by having the anterior dorsal soft rays produced into filaments, a pit between eye and nostril, no tooth on vomer, and nine longitudinal blue strips on both sides of the body. We propose a new Korean name, "Sil-tung-dom-sok" and "Sil-tung-dom" for the genus and species, respectively.

Seasonal Change of RNA/DNA Ratio and Blood Characteristics of Black Sea Bream Acanthopagrus schlegeli Habituated in Geojae Costal Area, Kyungnam Province, Korea (경남 거제해역에 서식하는 감성돔(Acanthopagrus schlegeli)의 연간 RNA/DNA 및 혈액학적 특성 변화)

  • Kim, Su-Kyoung;Shim, Na-Young;Lee, Do-Hyun;Kim, Dae Hyun;Yoon, Seong-Jong
    • Journal of Environmental Science International
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    • v.22 no.1
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    • pp.37-45
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    • 2013
  • The monthly variations of blood characteristics and RNA/DNA of black sea bream, Acanthopagrus schlegeli, habituated in Geojae costal area were analysed to determine health condition of natural stocks in terms of gonad maturation and spawning season from March 2010 to February 2011. Spawning season determinated by gonadosomatic index is from June to August. RNA/DNA ratio of black sea bream muscle was strongly correlated with spawning season. During the gonad maturation RNA/DNA ratio in dorsal muscle tissue was decreased contrast to rapid increase during spawning season. Blood composition factors increased in terms of gonad maturation are aspartate aminotransferase, cholesterol, triglyceride, total protein, glucose, globulin, alkaline phosphatase and inorganic phosphate. Other blood factors increased during spawning season are alanine aminotransferase, blood urea nitrogen, uric acid and lactate dehydrogenase.