• 제목/요약/키워드: Japanese waters

검색결과 91건 처리시간 0.025초

A New Record of the Genus Orchomenella (Crustacea, Amphipoda, Tryphosidae) from Korean Waters

  • Heo, Jun-Haeng;Kim, Young-Hyo
    • Animal Systematics, Evolution and Diversity
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    • 제35권2호
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    • pp.76-83
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    • 2019
  • The species Orchomenella littoralis Nagata, 1965 belong to the family Tryphosidae Lowry & Stoddart, 1997. Previously this species was only known from a single record identified in Japanese waters, and newly recorded from Baengnyeongdo-Island, on the west coast of Korea. The species is similar to Orchomene breviceps Hirayama, 1986 in carrying posteroventral teeth on epimeron 3. However, O. littoralis is characterized by the presence of 4-7 posteroventral teeth of epimeron 3, a round posterodistal lobe of coxa 4, and elongated antenna 2 in male. The species is described and fully illustrated in the present study. Also, a key to Korean Orchomenella species is provided.

DNA Barcoding of Rocinela niponia (Isopoda, Cymothooidea, Aegidae) from South Korea

  • Kim, Sung Hoon;Choi, Hyun Ki;Kim, Jong Guk
    • Animal Systematics, Evolution and Diversity
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    • 제38권2호
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    • pp.108-112
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    • 2022
  • An aegid species, Rocinela niponia Richardson, 1909, is a Far Eastern species known from Korean and Japanese waters. In this study, mitochondrial cytochrome c oxidase subunit I (COI) sequences of R. niponia were determined based on four specimens collected from the subtidal zone of Chujado Island, South Korea. We compared DNA barcoding data of this species with its congeners. As a result, there was no intra-specific genetic distance between the four COI sequences of R. niponia. Inter-specific distances between R. niponia and other five aegid species ranged from 23.8% to 35.6%. Morphological diagnosis and images of R. niponia are also provided as a valuable contribution toward the identification of Rocinela species in further taxonomic and ecological studies.

DNA Barcoding of Scolelepis (Scolelepis) sagittaria (Annelida, Spionidae) in Korea, with a Morphological Variability of the Species

  • Lee, Geon Hyeok;Yoon, Seong Myeong;Min, Gi-Sik
    • Animal Systematics, Evolution and Diversity
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    • 제38권3호
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    • pp.144-147
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    • 2022
  • The polychaete Scolelepis (Scolelepis) sagittaria was originally described from Japanese waters and subsequently reported from Korean waters. In this study, we determined for the first time the mitochondrial cytochrome c oxidase subunit I (COI), 16S ribosomal DNA (16S rDNA), and nuclear 18S ribosomal DNA (18S rDNA) sequences of Korean specimens of S. (S.) sagittaria. We also assessed intraspecific variation in the shape of the prostomium of this species based on an examination of 247 individuals. All materials were collected from intertidal sandy beaches of the Korea Strait. The molecular data and morphological observations reported herein will contribute to gaining a better understanding of the taxonomic relationships among members of the genus Scolelepis.

Year-to- Year Variation of Cold Waters around the Korea Strait

  • Min, Hong-Sik;Kim, Young-Ho;Kim, Cheol-Ho
    • Ocean Science Journal
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    • 제41권4호
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    • pp.227-234
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    • 2006
  • Year-to-year variation of bottom cold waters around the Korea Strait was investigated based on bottom temperatures measured by submarine telephone cable between Pusan, Korea and Hamada, Japan from 1982 to 1992. The characteristics of bottom temperatures could be divided into three different groups: the Korean side, the middle, and the Japanese side. Temperature drops in summer appeared in all the three regions implying the intrusion of cold waters into the Korea Strait. Significant decreases in the Korean side were observed in 1983, 1986, 1990, 1991, and 1992 when bottom temperatures were high in the middle. In contrast, bottom temperatures significantly decreased in the middle in 1985, 1988, and 1989 when the temperature drops in the Korean side were relatively small. This tendency for a negative relationship was also shown in the second mode of an EOF analysis. In the years when bottom temperatures significantly decrease din the Korean side, the cold water along the east coast of Korea expanded offshore and its temperature was low. On the contrary, cold water in the southern region of the Ulleung Basin developed in the years when bottom temperatures decreased considerably in the middle.

형태 및 분자분석에 의한 한국산 참서대과 어류(가자미목) 2종의 재동정 (Re-identification of Two Tonguefishes (Pleuronectiformes) from Korea using Morphological and Molecular Analyses)

  • 권혁준;김진구
    • 한국수산과학회지
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    • 제49권2호
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    • pp.208-213
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    • 2016
  • The re-identification of two Korean tonguefishes, Cynoglossus interruptus and Symphurus orientalis, was carried out using eight specimens collected from Korean waters in 2007 and 2013. C. interruptus is characterized by having a single row of scales between rows connected to the supraorbital line and the middle lateral line, 107–113 dorsal fin rays, 86–89 anal fin rays, and 53–55 vertebrae. S. orientalis is characterized by having a 1-2-2-2-2 ID pattern, 97–100 dorsal fin rays, 83–89 anal fin rays, and 52–55 vertebrae. Molecular analysis using mitochondrial DNA Cytochrome Oxidase subunit I sequences showed that specimens of the two species corresponded well to Japanese C. interruptus and Taiwanese S. orientalis, respectively. Therefore, although several reports have raised questions regarding the distribution of C. interruptus and S. orientalis in Korean waters, morphological and molecular data confirm that these two species are indeed distributed in these waters.

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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The Morphological and Growth Characteristics of Two Strains of Fibrocapsa japonica Isolated from New Zealand and Japan

  • Cho Eun Seob;Rhodes Lesley L.;Kim Hak Gyoon
    • Fisheries and Aquatic Sciences
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    • 제2권1호
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    • pp.17-24
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    • 1999
  • The blooms caused by Fibrocapsa japonica have occurred regularly in New Zea1andean coastal waters, and no fish kills and economic impacts have been reported. However, Fibrocapsa japonica in Japan killed caged juvenile fish and has been regarded as a harmful micro algae. In this comparative study a New Zealand isolate was found to be morphologically similar to a Japanese isolate, although slightly larger on average than. Optimal temperatures for growth differed, with fastest growth rates occurring at $22-24^{\circ}C$ for the New Zealand strain and $16-22^{\circ}C$ for the Japanese strain, with a decrease in growth rate exhibited by the latter at $25^{\circ}C$. Both isolates had low salinity optima of 20-25 PSU, although they grew between 15 and 30 PSU. Growth declined significantly for both strains above 30 PSU.

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Geographic Variation and Distribution of Rock Shell, Thais clavigera (Gastropoda: Muricidae) in the Korean Coasts

  • Son, Min-Ho;Hong, Sung-Yun
    • 한국어업기술학회:학술대회논문집
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    • 한국어업기술학회 2000년도 춘계수산관련학회 공동학술대회발표요지집
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    • pp.533-534
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    • 2000
  • In general, intertidal gastropods display a considerable amount of intraspecific shell variation (De Wolf et al., 1998). Particularly, thaisid species, including Thais clavigera(=T.c.), have been shown a variety of shell variation in the world ocean (e.g. T, emerginata in Kitching, 1976). Nomura (1926) noted local variation of shell morphology based on five Japanese populations. Ahe (1985) classified Japanese T.c. into two forms (Form-C &. -P). In the Korean waters, a strong variation in nodule shape of T.c, shell has also been noted by Choe & Park (1997). Taxonomy of T.c. is controversial so far. (omitted)

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해양목장 대상 어류의 음향순치에 관한 기초적 연구 -1. 돌돔의 청각 특성- (A Basic Study on Acoustic Conditioning of Fish Suitable for a Marine Ranch -1. The Sound Sensitivity of Japanese Parrot Fish Oplegnathus fasciatus-)

  • 김성호;이창헌;서두옥;김용주
    • 한국수산과학회지
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    • 제35권6호
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    • pp.563-567
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    • 2002
  • Developing base data on luring fish schools into netting position by the use of underwater audible sound on japanese parrot fish Oplegnathus fasciatus found in the coastal waters of Jeju Island, S. Korea. Auditory threshold was determined by the heartbeat condition technique using pure tones coupled with a delayed electric shock. The audible range of japanese parrot fish extended from 80 Hz to 500 Hz with a peak sensitivity at 200 Hz. The mean auditory thresholds at the frequencies of 80 Hz, 100 Hz, 200 Hz,300 Hz and 500 Hz were 104 dB, 95 dB, 91 dB, 99 dB and 113 dB, respectively. As the frequency became higher than 200 Hz, the auditory threshold increased almost linearly with increasing frequency. Critical ratios of fishes measured in the presence of masking noise in the spectrum level range of 69$\~$78 dB (0 dB re 1$\mu$Pa/$\sqrt{Hz}$) ranged from 21 dB to 40 dB at test frequencies. The noise spectrum level at the start of masking was about 70 dB within the test frequency range. The sound pressure level of 100$\~$200 Hz recognized by japanese parrot fish under the ambient noise is above 91 dB and the critical ratio for them is above 21 dB.

우리나라 주변 해양생태계의 장기 변동 (Long Term Changes Pattern in Marine Ecosystem of Korean Waters)

  • ;이충일
    • 해양환경안전학회지
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    • 제18권3호
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    • pp.193-198
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    • 2012
  • 겨울철 해표면 수온 및 한국 주변역 생태계의 장기 변화 특성 및 상관관계를 분석하였다. 기후 및 해양환경의 변화와 동반된 어획강도의 변화는 1970 년대 이후 어획량 증가의 주요 원인으로 나타났다. 한국 주변역의 겨울철 SST는 1980년대 후반 기후체제변환 시점을 중심으로 상대적으로 저수온에서 고수온으로 변화되었다. 평균영양단계(MTL)는 1970년대 중반 이후 지속적으로 감소하기 시작하였으며, 하위영양단계 어류의 어획량 증가가 중요 변수로 작용하였다. 통합생태계 기반 자원평가 방법중 한가지인 FIB 지수는 1970년 초부터 1970년 후반까지 증가하였으며, 이후 일정 수준을 유지하였다. 특히, 중간영양단계에 위치하는 멸치와 정어리의 개체수 변화는 1970년대 초 이후 MTL 변화의 주요 인자로 작용하였다.