• Title/Summary/Keyword: 서해

Search Result 2,142, Processing Time 0.036 seconds

문치가자미 (Limanda yokohamae)의 난발생에 미치는 수온의 영향

  • 나종헌;김진구;김용억
    • Proceedings of the Korean Society of Fisheries Technology Conference
    • /
    • 2000.05a
    • /
    • pp.477-478
    • /
    • 2000
  • 가자미과 (Pleuronectidae)에 속하는 문치가자미 (Limanda yokohamae)는 우리나라, 일본, 대만, 중국 등지에 분포하며 동일 속의 4종과 달리 우리나라 남.서해안에서만 서식하고 (김과 윤, 1994), 우리나라 서해안에서는 북위 37$^{\circ}$를 경계로 하계 및 동계 분포가 뚜렷하게 구분되는 계절회유성 어종으로 알려져 있다(김 등, 1994). (중략)

  • PDF

Comparison of the Seawater-Sediment Environment and Habitat Properties with Variable Mud Shrimp Upogebia major Burrow Hole Density and Its Influence on Recruitment and Settlement in the Cheonsu Bay Tidal Flats (천수만 갯벌, 쏙(Upogebia major) 유입 및 정착 밀도에 따른 해수-퇴적물 환경과 서식지 특성 비교)

  • Jeon, Seung Ryul;Ong Giho;Koo, Jun-Ho;Park, Jong-Woo;Kim, Yu Cheol;Jeung, Hee-Do;Cho, Jae-Kwon
    • Korean Journal of Fisheries and Aquatic Sciences
    • /
    • v.55 no.2
    • /
    • pp.171-182
    • /
    • 2022
  • The habitat degradation caused by large-scale reclamation leads to devastating impacts, such as fine sediment and mud shrimp Upogebia major settlement on Manila clam Ruditapes philippinarum aquaculture in the eastern Cheonsu Bay tidal flats, Republic of Korea. Despite these impacts, there is a lack of studies on the influence of fine sediments on tidal flats that constitute key mud shrimp habitats. This study provides information on the seawater-sediment environment and the influence of dissolved inorganic nitrogen (DIN) fluctuations depending on mud shrimp burrow hole density. Additionally, it discusses countermeasures for Manila clam habitat management. The results show that mean DIN effluxes in areas with a high-density of burrow holes were up to 4 times (0.12 mmol m-2 d-1) higher than those in sites of low-density (0.03 mmol m-2 d-1) within the Saho and Songhak-ri tidal flats. To manage interference within the competition zone of Songhak-ri tidal flat, it is important to utilize the settlements of spawning season in all three dimensions. Consequently, additional studies in other tidal flats are essential and research in zones where mud shrimps and juvenile clams coexist will help to determine the priorities in the efficient management of clam aquaculture.

Study on Efficient Response Skill in the Yellow Sea Coast of Korea under Bad Weather (기상악화시 우리나라 서해안의 효율적인 방제방법 고찰)

  • Yun, Jong-Hwui;Gug, Seung-Gi;Moon, Jung-Hwan;Jang, Ha-Yong;Kuk, Eun-Mi;Ha, Min-Jae
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
    • /
    • 2010.04a
    • /
    • pp.402-403
    • /
    • 2010
  • Hebei Spirit Oil Spill in the West Coast in 2007 happened catastrophic environment and economy damage. Refer to the limitation of current oil spill response methods. and oil spill response in the Yellow sea coast of korea, effective measures are considered.

  • PDF

한반도 조력자원 개발타당성

  • Lee, Gwang-Su
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 2005.11a
    • /
    • pp.342-350
    • /
    • 2005
  • 우리나라 서해안 중부, 경기만 일대는 강한 조석과 잘 발달된 해만으로 인해 천혜의 조력자원 보고로 알려져 있으나, 1980년대부터 서 남해 연안역에 대한 대규모 매립과 항만개발 등으로 조력개발입지 자체가 상실되고, 조석체계도 변화되고 있다. 한편 조력에너지는 기존의 화석연료를 대체할 수 있는 개발가능한 신 재생 에너지 중에서 거의 유일하게 대규모로 개발이 가능한 것으로 평가되고 있어 개발시 기대효과는 매우 클 것이다. 이에 우리나라 서해안의 조력자원 부존량을 파악하고 주요 후보지에 대한 개발타당성 검토를 통하여 주요 조력자원 후보지를 타 개발로부터 보호하고, 민간참여를 유도하여 조력에너지 개발을 활성화하고자 본 조사를 추진하였다. 한반도 조력자원 개발타당성 검토를 위하여 1) 서해안의 주요 지점에 대한 조석특성을 조사하였고, 2) 주요 조력자원 후보지 위치 및 영역을 설정하였으며, 3) 조석체계변화예측 수치모형실험을 실시하였고, 4) 후보지별 발전소 평면배치계획을 수립하였으며, 5) 후보지별 연간발전량과 개략공사비를 산출하여 6) 후보지별 개략타당성 검토를 수행하였다. 검토결과 우리나라 서해안의 조력개발 가능규모는 215만kW 정도이며, 주요 후보지를 모두 개발할 경우 연간 3,826GWh의 전기를 생산할 수 있을 것으로 조사되었다. 또한 연간발전량 대비 순공사비 비율에 따르면 만 입구가 좁아 개발 경제성 확보가 유리한 가로림만을 우선 추진하고, 이후 인천만, 천수만 순으로 개발하는 것이 유리한 것으로 나타났다.

  • PDF

Maturity and Spawning of the Greenling, Hexagrammos otakii in Coastal Waters near Incheon, Korea (인천 연안에 서식하는 쥐노래미(Hexagrammos otakii)의 성숙과 산란)

  • Seung Hwan Lee;Tae Hyoung Roh;Dea Hyeon Kwon;Dong Hyuk Choi
    • Korean Journal of Ichthyology
    • /
    • v.35 no.4
    • /
    • pp.333-339
    • /
    • 2023
  • The aim of this study was to collect information regarding the sex ratio, size at sexual maturity, and the primary spawning period of Hexagrammos otakii. The sex ratio (female : male) was observed to be 1 : 1.2 (n =739 : 906, with females comprising 81.6% of the population). The gonadosomatic index (GSI) exhibited its highest values in November for females and October for males, coinciding with the primary spawning period from November to January. The total length required for 50% sexual maturity was determined through a logistic regression model and found to be 23.1 cm for females.

A Study of Storm Surges of the Seas in North eastern asia I. Analysis of Yearly Maximum Surge (東北 아시아 海域의 暴風海溢 硏究 I. 暴風海溢 年別 極値 分析)

  • 이진경;오임상
    • 한국해양학회지
    • /
    • v.29 no.1
    • /
    • pp.28-41
    • /
    • 1994
  • The hourly sea level data are analyzed in order to find the general characteristics of the storm surges at the coasts of Korea, Japan and Russia. the surges are calculated by removing the predicted tides from the observed sea level at 44 tidal stations. In korea, positive and negative surges of the west coast are larger than those of the south and east coasts. The magnitudes of negative surges are larger than those of positive surges at the west of Japan. The surges of the northern Russian coast are relatively larger than those of the southern west coast of japan. The yearly maximum positive surges at the west coast of Korea, are found to be caused by extratropical storm, but the maximum positive surges at the south or the east coast of Korea are due to the summer typhoon. Mostly the yearly maximum negative surges occur at the west coast of Korea (particularly Inchon), and they are caused by extratropical storm.

  • PDF

Proposal of Empirical Formula for Bedform Size on West Coast of Korea (서해안의 해저표면형상 예측 경험식 제안)

  • Kim, Hyoseob;Yoo, Hojun;Jang, Changhwan
    • Journal of Wetlands Research
    • /
    • v.14 no.4
    • /
    • pp.457-469
    • /
    • 2012
  • Bedform data at 4 shallow zones in the Yellow Sea where waves as well as tidal range are high and bed material is relatively coarse were collected and analyzed here. Water depths in the study area where the bedform data were collected are 10 ~ 65 meters, and ripple lengths well developed are between 6 ~ 13 meters. Existing empirical formula for prediction of ripple length as for coexistence of waves and currents include Khelifa and Ouellet(2000) and Soulsby(2005), both of which have been based on laboratory measurements, or field measurements at different physical environment from the Yellow Sea with respect to tidal range, wave strength, and bed material. New scaling factors are proposed here for better prediction of the ripple length on coastal zone in the Yellow Sea.

Genetic Analysis of Mitochondrial DNA from Korean Oysters, Crassostrea gigas (한국산 참굴(Crassostrea gigas) 미토콘드리아 DNA의 유전적 분석)

  • KIM Sang Hae;PARK Mi Seon;KIM Young Hun;PARK Doo Won
    • Korean Journal of Fisheries and Aquatic Sciences
    • /
    • v.30 no.5
    • /
    • pp.804-808
    • /
    • 1997
  • The genetic differentiation and characteristics of two oyster populations (Crassostrea gigas) in Korea were assessed based on the restriction fragment length polymorphisms (RFLP) analysis and the restriction patterns of subcloned mtDNA. The restriction fragments of twenty individuals in West Sea revealed an identical pattern, determined by 8 restriction enzymes. On the other hand, two haplotypes having variation at the HindIII site were shown in the specimens from South Sea; minor haplotypes (4 of 20) were similar to the results obtained from individuals in West Sea while major haplotypes were different from those in West Sea. It was suggested that oysters (C. gigas) of West Sea might have been introduced to South Sea. Each mitochondrial DNA from two oyster populations in Korea and from one in Japan was divided to three parts and subcloned into pUC19 to use in genetic studies effectively. Restriction map was constructed based on the cleavage pattern by multiple restriction enzymes.

  • PDF

Antimicrobial Resistance Characteristics of Gram-Negative Bacteria Isolated from Inland Pollution Sources in the Drainage Basin of Iwon-myeon (Taean-gun), South Korea (태안군 이원면 육상오염원 배출수에서 분리한 그람음성균의 항생제 내성 특성)

  • Park, Bo Mi;Kim, Min Ju;Jeong, Yeon Gyeom;Park, Jin Il;Yu, Hong Sik;Oh, Eun Gyoung
    • Korean Journal of Fisheries and Aquatic Sciences
    • /
    • v.54 no.4
    • /
    • pp.377-387
    • /
    • 2021
  • Fecal contamination levels of discharge water from inland pollution sources were investigated in Iwon-myeon (Taean-gun), South Korea. Gram-negative bacteria were isolated during the investigation and the antimicrobial resistance patterns of the isolates were examined to estimate their impact on the coastal environment. The ranges of total coliform and fecal coliform of 12 samples from four major inland pollution sources were 79-490,000 MPN/100 mL and 2.0-490,000 MPN/100 mL, respectively, with the highest level of fecal contamination at Station No. 3. A total of 137 strains (14 genus) were isolated, of which 86 strains (62.8%) were Enterobacteriaceae. The identified isolates were as follows: Pseudomonas spp. (35 strains), Klebsiella spp. (20 strains), Serratia spp. (20 strains), and Escherichia spp. (19 strains). The isolated Gram-negative bacteria showed the highest antimicrobial resistance to ampicillin (81.8%), followed by amoxicillin/clavulanic acid (64.2%), ceftiofur (61.3%), and cefoxitin (59.1%). Antimicrobials in which less than 10% of isolates showed antimicrobial resistance were ciprofloxacin (3.6%) and gentamicin (2.2%). Resistance to one or more antimicrobials was observed in 121 strains (88.3%) and 84 strains (61.3%) showed a tendency for multiple antimicrobial resistance.

Detection of Vancomycin Resistance Genes and Antibiotic Resistance Characteristics of Enterococcus spp. Isolated from Inland Pollution Sources Near Shellfish Farms on the West Coast of South Korea (서해안 패류양식장 인근 육상오염원에서 분리한 장구균의 Vancomycin 내성 유전자 검출 및 항생제 내성 특성)

  • Jeong, Yeon Gyeom;Park, Bo Mi;Hwang, Jin Ik;Kim, Min Ju;Oh, Eun Gyoung
    • Korean Journal of Fisheries and Aquatic Sciences
    • /
    • v.55 no.5
    • /
    • pp.505-513
    • /
    • 2022
  • In this study, 143 strains of Enterococcus spp. were isolated from inland pollution sources near shellfish farms on the west coast of South Korea. Not all isolated Enterococcus spp. strains possessed vancomycin resistance genes (VanA and VanB). However, since vancomycin-resistance Enterococcus (VRE) have been detected not only in the clinical field but also out in the world, it is possible that the VRE gene may be transferred to other bacterial strains commonly found in coastal waters where seafood is produced. It is important to monitor trends in the appearance of VRE. In addition, antimicrobial resistance patterns of isolates were examined in this study. Overall antimicrobial resistance rates were high: ciprofloxacin (32.2% of isolates resistant), chloramphenicol (30.8%), quinupristin/dalfopristin (19.6%), and tylosin (15.4%). Eight E. faecium strains (6.2%), out of the 129 strains assessed, showed multidrug resistance. All multidrug-resistant E. faecium showed resistance to erythromycin, quinupristin/dalfopristin, tetracycline, and tylosin, in all 14 strains. All multidrug-resistant E. faecalis showed resistance to erythromycin, quinupristin/dalfopristin, tetracycline, and tylosin. Both multidrug-resistant E. faecium and multidrug-resistant E. faecalis showed common resistance to erythromycin, quinupristin/dalfopristin, tetracycline, and tylosin.