• 한국환경과학회지
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• 제30권10호
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• pp.811-820
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• 2021

The population variation of Spanish mackerel (Scomberomorus niphonius) according to its major prey abundance was analyzed using monthly catches of coastal set net fisheries in the southern waters off Gyeongsangnam-do and eastern waters off Gyeongsangbuk-do of Korea from 2006 to 2019. The abundance of Spanish mackerel and its prey species fluctuated almost simultaneously with time lags of +2 to -2 months between the set net fisheries in the southern and eastern waters. The generalized additive model revealed that the abundance of Spanish mackerel was influenced by its prey species such as hairtail and anchovy in southern waters, and common mackerel and horse mackerel in eastern waters. The model deviance explained 49% and 42% of Spanish mackerel abundance in southern and eastern waters respectively. These results suggest that the abundance of Spanish mackerel is affected by seasonal migratory prey fish species in the coastal areas and can be linked to their northerly migration.

• 수산해양기술연구
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• 제34권1호
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• pp.52-61
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• 1998

We studied behaviour pattern of anchovy (Engraulis japonicus) shoal by a method of shoal echo integration and tested species identification by a method of artificial neural network using the acoustic data collected in the East China Sea in March 1994 and in the southern coastal waters of the East Sea of Korea in March 1995. Between areas, frequency distribution of 10 shoal descriptors was different, which showed characteristics of shoal behaviour in size, bathymetric position and acoustic strength. The range and mean of shoal size distribution in length and height was wider and bigger in the southern coastal waters of the East Sea than in the East China Sea. Relative shoal size of China Sea. Fractal dimension of shoal was almost same in both areas. Mean volume reverbration index of shoal was 3 dB higher in the southern coastal waters of the East Sea than in the East China Sea. The depth layer of shoal distribution was related to bottom depth in the southern coastal waters of the East Sea, while it was between near surface and central layer in the East China Sea. Principal component analysis of shoal descriptors showed the correlation between shoal size and acoustic strength which was higher in the southern coastal waters of the East Sea, than in the East China Sea. Correlation was also found among the bathymetric positions of shoal to some degree higher in the southern coastal waters of the East Sea than in the East China Sea. The anchovy shoal of two areas was identified by artificial neural network. The contribution factor index (Cio) of the shoal descriptors between two areas were almost identical feature. The shoal volume reverberation index (Rv) was showed the highest contribution to the species identification, while shoal length and shoal height showed relatively high negative contribution to the species identification.

• 한국수산과학회지
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• 제16권4호
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• pp.401-409
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• 1983

1981년과 1982년 $4{\sim}6$월에 한국 남해와 서해 연근해에서 채집된 멸치의 난치어 및 해양관측 자료를 사용하여 수괴배치에 따른 멸치의 난치어의 분포를 분석하였다. 온도전선은 남해에서는 제주도와 대마도를 잇는 선상에서 한국남안연안수와 대마난류간에 형성되었고 서해에서는 태안반도이남해역과 해안선과 평행하게 남북으로 한국서안연안수와 황해냉수간에 형성되었다. 한국남해에서 멸치난은 온도전선 내측인 연안측에서, 멸치 치어는 온도전선을 중심으로 연안측과 외해측으로 분리되어 출현하였다. 그러나 한국서해에서 멸치난과 치어는 온도전선내측과 온도전선역인 $12^{\circ}C$ 이상의 해역에서만 출현하였다. 치어의 체장조성을 보면 남해에서는 연안측에서 전기자어가, 외해측에서 후기자어 및 치어기의 멸치가 주로 출현하였으나, 서해에서는 남부해역에서는 전기자어가 북부해역에서는 후기자어가 주로 출현하였다. 또한 온도전선의 경도가 큰 1981년에는 1982년에 비하여 난과 치어의 분포범위가 크게 제한을 받으므로서 전선의 강약은 난과 치어의 분포에 큰 영향을 주는 것으로 추정된다.

• Fisheries and Aquatic Sciences
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• 제12권3호
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• pp.240-248
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• 2009

Distribution and abundance of planktonic shrimps were studied in the southern sea of Korea from 1987 to 1991. Nine species of five genera belonging to three families were identified. Of these, Leptochela sydniensis and Lucifer intermedius were predominant species and Lucifer penicilifer and Lucifer typus were common species. Remaining five species, Acetes chinensis, Leptochela gracilis, Lucifer chacei, Process wheeleri and Sergestes similis occurred sporadically and rarely. The distribution pattern of planktonic shrimps varied with species and sampling periods. L. intermedius occurred abundantly along inshore waters. L. penicilifer and L. typus appeared in both inshore and offshore waters, but more abundantly in offshore waters under influence of the Tsushima Current. In conclusion, the distribution patterns of planktonic shrimps may be related with hydrographic characteristics and seasonality in the southern sea of Korea.

• 한국해양학회지
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• 제2권1_2호
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• pp.1-12
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• 1967

바다의 플랭크톤은 장소와 시기에 따라 출현종류와 수량에 많은 변동이 있고, 이것들의 종적조성, 출현수량 또는 그 분포는 바다의 생태계를 구명하고, 해역의 생산성을 계측하는데 극히 중요한 기초적지식이 될뿐아니라 어업과 바다의 양 증식 에도 직접적인 관련을 갖는 중요한 자료가 된다.

• 한국수산과학회지
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• 제48권4호
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• pp.529-541
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• 2015

We examined the species composition and community structure of demersal fish in the middle and southern coastal waters of the East Sea of Korea by surveying a commercial Danish seine fishery from 2010 to 2013. We considered the waters north of $37^{\circ}N$ as middle and those south of $37^{\circ}N$ as southern waters. A total of 79 demersal fish species belonging to 18 families were collected. Of these, 59 species (77.6%) inhabited only the East Sea as opposed to the West and South Seas of Korea, and most were resident species. The species and biomass were similar between the two portions of the study area. The sandfish Arctoscopus japonicus (78.0%) and the blackfin flounder Glyptocephalus stelleri (65.1%) were the most common species and accounted for the most biomass in the middle and southern waters, respectively. Fish were most abundant at shallow depths (50-100 m) in the middle portion of the East Sea. Using a cluster analysis, we divided the species composition and community structure at the sampling stations into three groups: middle portion (group A), deep area of the southern portion (group B), and shallow areas of the southern portion (group C). A. japonicas and G. stelleri were dominant in groups A and B, while G. stelleri and Clupea pallasii were dominant in group C.

• 한국수산과학회지
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• 제23권3호
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• pp.208-214
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• 1990

한국 남해에 있어서 식물플랑크촌의 현존양은 4월이 가장 많으며 그 지리적 분포상태는 주로 연주도와 대마도간의 수온전선형성해역에 가장 풍부하고 그 전선에서 연안측이 외양측보다 더욱 풍부한 경향이므로 전선형석 위치에 따라 그 농도가 달라지게 된다. 현존양이 2월과 4월에는 최고양으로 출현한 205선의 01점에 8월에는 반대로 최소양으로 출현한 이유는 이 해역의 환경요인이 다른 연도의 것보다 뛰어나게 고온, 고염, 빈산소 및 빈영양상태이므로 이들의 특성을 지닌 Tsushima 난류수괴가 연안까지 침투한 까닭인 것으로 사료된다. 출현종류는 33속 72종 중 규조류가 27속 61종이고 경모조류가 6속 11종이며 시기별 출현종류수는 출현량이 4월에 가장 많은데 비해 8월이 가장 많은 것으로 나타났다. 우점종의 조성은 2월은 Eucampia zodiacus, 4월은 Skeletonema costatum과 Chaetoceros curvisetus 및 8월은Chaetoceros affinis 등으로서 시기별로 대차가 있었다. Eucampia zodiacus는 2월과 4월에 있어서 남해연안수역과 제주도 서방의 혼합수역을 지표하는 지표종으로서의 가치가 있다고 본다.

• Journal of the korean society of oceanography
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• 제38권3호
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• pp.101-110
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• 2003

We made intensive observations on the coastal upwelling off the coast of the southern East Sea from June to August in 2001. The upwelling exhibited a weekly waxing and waning. The coastal upwelling of the year 2001 was characterized by abrupt outbreaks and the small local scale. Upwelling occurred more frequently off the coast of Ulsan and Gampo as reported by the earlier observers. The spread of freshly upwelled colder water was varied by each upwelling event. Generally cold waters were carried away northeastward off Pohang province. The upwelled cold waters were saltier than the resident surface waters. The pH and salinity-normalized alkalinity support the idea that the upwelled waters originate from the interior of the East Sea. The extraordinarily high concentration of dissolved oxygen suggests that the upwelled waters are closely connected to the southward flowing North Korea Cold Current. Although a lower primary productivity was reported for the upwelling region, underway surface fluorescence measurement revealed that the recently upwelled waters supported up to an order of magnitude higher algal biomass than the ambient waters. Because thermohaline circulation of the East Sea is so vigorous, with an estimated time scale of less than one hundred years, that the coastal upwelling should be considered not as an anomaly but as a regular component of a circulatory system. A quantitative understanding of upwelling seems to be a key to elucidate material cycling and the associated biological production in the East Sea.

• 한국수산과학회지
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• 제3권3호
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• pp.199-206
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• 1970

한국 남해 연안 해역의 바람 자료를 사용하여 Palmen 식에 의해 순별 취송류를 계산하였다. 한국 남해안의 바람의 특성에 관하여도 간단히 언급하였다. 바람의 응력과 취송류를 정확하게 계산하기 위하여는 아직도 해결되어야 할 여러 가지 문제점이 있다. 이 계산 결과는 한국 남해안의 개략적인 취송류 자료로 사용될 수 있을 것이라 생각된다.

• Ocean and Polar Research
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• 제32권4호
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• pp.411-426
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• 2010

남해 연안에 출현하는 동물플랑크톤 군집의 계절 변화와 주요 분류군의 변동 양상을 파악하기 위해 2005년 5월부터 2006월 2월까지 사계절 동안 실시하였다. 사계절 동안 출현한 동물플랑크톤은 전체 74개 분류군이 출현하였고, 평균 출현 개체수는 2,426~23,793 indiv./$m^3$ 범위였으며, 이 중 N. scintillans가 가장 우점하는 분류군이었다. 동물플랑크톤 주요 분류군은 N. scintillans, A. omorii, A. erythraea, P. parvus s. l, 십각류 유생, Aidanosagitta crassa, 따개비 유생으로 나타났다. 여름철의 동물플랑크톤의 종 다양성 지수는 내만 해역에서 주로 높게 나타났으며, 가을철에 외만에 위치하는 조사해역에서 낮게 나타났다. 이것은 남해 연안의 동물플랑크톤 출현 개체수 변동이 계절에 따른 수온, 염분과 엽록소-a 농도, N. scintillans의 대량 증식에 따라서 변동할 수 있으며, 또한 계절에 따른 대마난류의 세력확장에 따라서 조절될 수 있음을 시사한다.