• 제목/요약/키워드: Southern waters

검색결과 440건 처리시간 0.025초

한국남해의 여름과 겨울철 성층변동 (Stratification Variation of Summer and Winter in the South Waters of Korea)

  • 이충일;구도형;윤종휘
    • 해양환경안전학회:학술대회논문집
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    • 해양환경안전학회 2007년도 춘계학술발표회
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    • pp.43-50
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    • 2007
  • In order to calculate the strength and to. see the variation af the stratification in the Southern Waters af Korea, the stratification parameter defined as potential energy anomaly (PEA, $V(J/m^3)$) introduced by Simpson and Hunter (1974) was used The data used in this paper were observed in August 1999 and February 2000 by National Fisheries Research and Development Institute (NFRDI). Also to know the effects af the temperature and the salinity an the stratification respectively, averaged temperature and salinity were used in the process af calculation the parameter. V is generally high in the offshore. However, in February, V in the onshore is higher than that of the offshore due to the vertical temperature gradient caused by the expansion of South Korean Coastal Waters (SKCW). In the summer, the increase af the atmospheric heating, the temperature inversion phenomenon act an the stratification as the buoyancy forcing. In most cases, the effects of the temperature on the stratification is stronger than that of the salinity. The temperature effect is predominantly due to the extent af the intrusion of Tsushima Warm Current into the study area. However, at stations where V is high the effect af the salinity is also significant. In the winter, V is very low due to the decrease of the buoyancy forcing, but same stations show the relatively high V due to the expansion of SKCW and Tsushima Warm Current.

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A New Record of Pandalid Shrimp Procletes levicarina (Crustacea: Decapoda: Caridea) from Korean Waters

  • Kim, Jung-Nyun;Choi, Jung-Hwa;Oh, Taeg-Yun;Choi, Kwang-Ho;Lee, Dong-Woo
    • Fisheries and Aquatic Sciences
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    • 제14권4호
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    • pp.399-401
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    • 2011
  • The pandalid shrimp Procletes levicarina (Bate, 1888) was newly collected from the western and southern waters of Jeju Island, Korea. This species is the only known member of the genus Procletes which belongs to the family Pandalidae. Morphological description and illustration with a color photograph of the species are given. With the addition of P. levicarina, the family Pandalidae in Korean waters consists of 10 species belonging to 5 genera.

New Occurrences of Two Penaeid Species (Crustacea: Decapoda: Dendrobranchiata) in Korean Waters

  • Kim, Jung Nyun;Choi, Jung Hwa;Lee, Jeong-Hoon;Kim, Joo Il
    • Fisheries and Aquatic Sciences
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    • 제16권4호
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    • pp.325-329
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    • 2013
  • New occurrences in Korean waters were recorded for two penaeid species: Atypopenaeus stenodactylus (Stimpson, 1860) and Metapenaeopsis toloensis Hall, 1962, which were previously known from the Indo-West Pacific up to southern Japan. The specimens were collected from the southeastern coast of Korea by a shrimp beam trawl. The former is the only known member of the genus Atypopenaeus and the latter is the sixth species of the genus Metapenaeopsis reported in Korea. Morphological descriptions and illustrations with color photographs of the specimens are given. At present, the Korean Penaeidae consist of 20 species in 11 genera. A key to the Korean genera of family Penaeidae is also presented.

한국 남해안의 잠재어업자원 조사연구 - 저층크롤 어획량의 생물학적 조성 - (Investigations of the Potential Fisheries Resources in the Southern Waters of Korea - Biological Composition of Demersal Trawl Catches -)

  • 이대재;김진건;신형호
    • 수산해양기술연구
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    • 제34권3호
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    • pp.241-258
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    • 1998
  • 우리나라 남해안에 대한 어업생물자원의 평가와 관리 및 유효이용방안 등을 모색하기 위한 기초연구로서, 남해안의 전해역에 설정한 생물학적 샘플링 정점을 대상으로 저층트롤에 의한 시험조업을 실시하고, 이들 정점에서 샘플링된 어획물의 생물학적 조성, 計量魚探調査와 관련한 漁獲選擇性의 영향 底棲漁業資源의 분포실태 등을 분석, 고찰한 결과를 요약하면 다음과 같다. 1. 1996년 10월과 1997년 1월, 3월, 7월~8월, 9월 ~ 10월에 우리나라 남해안에 설정한 64개의 조사정점을 대상으로 저층트롤에 의한 시험조업을 실시한 결과, 魚類 114종, 軟體類 8종, 甲殼類 7종(총 129종)에 총 9,9910.6 kg이 어획되었는 데, 이 중에서 어류의 점유비율은 전갱이 19.8%, 고등어 15.0%, 달강어 6.2%, 전어 6.1%, 병어 5.1%, 아귀 5.1%, 눈볼대 3.6%, 밴댕이 3.5%, 꼼치 3.4%, 꼬치고기 1.4% 등이었고, 甲殼類로서는 깨다시꽃게 0.34%, 보리새우 0.18% 등이었고, 頭足類로서는 창꼴두기 9.0%, 살오징어 5.8%, 참갑오징어 0.28% 등이 어획되었다.2. 1996년 ~ 1997년 사이에 우리나라 남해안에 설정한 트롤조사정점을 대상으로 실시한 저층트롤조업에 의해 어획된 어획량을 트롤예망층의 공간체적으로 나누어 산출한 단위체적당에 대한 어업생물자원의 분포밀도는 해역, 계절, 어획 어종의 조성, 조업시간 등에 따라 큰 차이를 나타내었으나, 그 값은 17.9 x 10$^{-6}$ ~ 1,440.9 x 10$^{-8}$kg/m$^{3}$의 범위였고, 그 평균적인 분포밀도는 153.8 x 10$^{-6}$kg/m$^{3}$이었다. 3.우리나라 남해안에 설정한 64개의 조사정점에서 어구의 파망사고 및 조업장애가 없었던 50개의 트롤정점을 대상으로 끝자루와 커버 네트에 의한 어획비율을 조사한 결과, 커버 네트에 의한 어획비율은 0.7 ~ 91.9%의 범위로서, 그 평균적인 어획비율은 44.4%였다. 이처럼 우리나라 남해안에서는 어족자원의 감소 등에 기인하여 소형어의 어획비율이 매우 높은 실정이기 때문에 향후, TAC제도가 도입되는 경우, 조업어선에서는 상품 가치가 적은 이들 소형어를 바다에 그대로 폐기할 우려가 있으므로 소형어의 어획방지와 서식환경의 보호를 위한 대책의 수립이 절실히 요구된다.

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Screening and Identification of Salt Tolerant Peanut (Arachis hypogaea L) Genotypes under Salinity Stress

  • Rizwana B.Syed Nabi;Eunyoung Oh;Myoung Hee Lee;Sungup Kim;Kwang-Soo Cho;Jeongeun Lee;Jung In Kim;Eunsoo Lee;Min Young Kim;Sang Woo Kim
    • 한국작물학회:학술대회논문집
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    • 한국작물학회 2022년도 추계학술대회
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    • pp.113-113
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    • 2022
  • Salinity in surface waters is increasing around the world. Many factors, including increased water extraction, poor irrigation management, and sea-level rise, contribute to this change, and posing a threat to plant development and agricultural production. Seeds exposed to high salinity, have a lower probability of germinating and various physiological and biochemical effects. Salinity stress affects more than 20% of agricultural land and about 50% of irrigated land. In the current study, our objective is to identify the salt-tolerant peanut (Arachis hypogaea L.) Korean genotypes under salinity stress. Thus, two-week-old 19 diverse peanut Korean genotypes were exposed to 10 days of salinity (150 mM NaCl) stress. Based on the growth attributes investigation, Baekjung and Ahwon genotypes showed significantly higher shoot lengths compared to control plants. Whereas, the Sinpalwang genotype exhibited a significantly positive response for plant growth and reduced wilting symptoms compared to other genotypes. This study was able to find out peanut tolerant and sensitive genotypes for salt stress. These results may provide a good template for further salt-tolerant peanut cultivar improvement programs. Identified diverse salt-responsive genotypes can be utilized as source material in Korean breeding schemes for peanut crop improvement for salt and other abiotic stress tolerance.

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Primary Production System in the Southern Waters of the East Sea, Korea III. Vertical Distribution of the Phytoplankton in Relation to Chlorophyll Maximum Layer

  • Shim, Jae-Hyung;Park, Jong-Gyu
    • Journal of the korean society of oceanography
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    • 제31권4호
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    • pp.196-206
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    • 1996
  • Vertical profiles of the chlorophyll ${\alpha}$, phytoplankton abundance, nutrients and sigma-t were compared with the vertical distribution of phytoplankton species in conjunction with $^{14}$C primary production in the Southern Waters of the East Sea, Korea. In the upper mixed layer the water column was only weakly stratified and ambient nitrogenic nutrient concentrations were markedly depleted. Dissolved silicate seemed to be another limiting nutrient in the surface layer. The occupation of different water depths by several dominant diatom species was well explained by the degree of silicification of each cell and the silicate concentration of ambient seawater. Subsurface chlorophyll maxima were continuously observed in the lower parts of the euphotic layer and the depth coincided with nutricline, supporting our view that chlorophyll maximum was sustained partially by enhancement of in situ growth of phytoplankton and partially by increase of cellular chlorophyll content. The persistence of chlorophyll maximum layer was attributed to the physiological adaptation of the phytoplankters to low light intensities and to the utilization of regenerated nutrients. Integrated water column production of organic matter by photosynthesis appeared to be better related to phytoplankton cell division than to the cell growth in terms of biosynthesis of pigments and other intracellular components.

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한국 남해안 문치가자미, Pleuronectes yokohamae (Günther)의 연령과 성장 (Age and Growth of Marbled sole, Pleuronectes yokohamae (Günther) in the southern waters of Korea)

  • 김희용;허선정;김성태;서영일
    • 수산해양기술연구
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    • 제51권1호
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    • pp.35-41
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    • 2015
  • The age and growth of the Marbled sole, Pleuronectes yokohamae were investigated using left sagittal otoliths of 832 individuals collected in the mid-southern waters of Korea from January 2006 to April 2007. The seasonal changes in the ratio of an translucent zone to interval between annular rings revealed that the boundaries between translucent and opaque parts of the otolith were annual growth rings formed between May and June once a year. The spawning period was November to March and therefore the duration from fertilization to the complete formation of the annual growth ring became fifteen months. The parameters of von Bertalanffy growth equations estimated using the average standard length at each age are the $L_{\infty}$ of 48.04cm, K of 0.1406/year and $t_0$ of -0.5116 for female and 26.14cm, 0.3056/year and -0.8202 for male, respectively. Finally, it is suggested that the growth of female is faster than that of male from age-2.

한국남해동부해역에서 수온이 멸치와 김 생산량에 미치는 영향 (Effect of Temperature on Catches of Anchovy and Laver In Eastern part of South Sea of Korea)

  • 김현주;권철휘
    • 해양환경안전학회:학술대회논문집
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    • 해양환경안전학회 2003년도 추계학술발표회
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    • pp.175-180
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    • 2003
  • 수온과 멸치와 김 생산량의 관계를 규명하기 위해, $1980\~2002$년 한국 남해 동부해역에서 생산량과 해양관측자료를 분석하였다. 한국 남해 동부해역에서 년간 멸치와 김 생산량은 들 다 해마다 변동은 있으나 전반적으로 점차 증가하는 추세를 보였다. 멸치와 김 생산량은 해양환경 특히, 수온과 밀접한 관계가 있는 것으로 나타났다. 즉, 표층은 평년보다 높고, $0\~20m$에서의 수온은 평년보다 낮았을 때 특히 저층에 약 $15^{\circ}C$ 이하의 저온수가 존재했을 때, 들 다 생산량이 저조하였다.

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한국 주변해역에서의 개복치(Mola mola) 어획현황 (Catch Distribution of Ocean Sunfish Mola mola off Korean Waters)

  • 이동우;최정화;최광호
    • 한국수산과학회지
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    • 제46권6호
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    • pp.851-855
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    • 2013
  • To determine the status of sunfish fishery, fishing places, body size, weight, etc. were investigated from 2010 to 2012 in Busan Cooperative Fish Market. Most of the sunfish were caught by large purse seine around Jeju island, and the fishing ground of sunfish were reached from Heuksando in the southern Yellow Sea to Guryongpo in the southern East Sea. The range of total length (TL) of the sunfish caught by purse seine was 55-271 cm, and the estimated length-weight relationship was $BW=8E-06TL^{3.3797}$. From the relationship, the weight of 50 cm in total length was estimated to be ca. 4 kg, TL 100 cm was ca 46 kg, TL 200 cm was ca 478 kg, and TL 271 cm was estimated to be 1,336 kg.