• Korean Journal of Ichthyology
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• v.19 no.3
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• pp.210-224
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• 2007

Fish community study by a gill net in four coastal waters of Southern Sea, Korea were simultaneously conducted to determine seasonal variation of species composition and abundance from March to November, 2006. A total of 68 species and 577,422.9 g by four study waters were caught during the survey period. The dominant species were Platycephalus indicus, Mugil cephalus, Cynoglossus robustus and Argyrosomus argentatus of 58.2% in total catch and they occupied 63.1% in IRD (index of relative distribution). By regional community, fishes that compromised 18 species and 53,148.8 g in Tongyeong Donam were caught and the dominant species were Platycephalus indicus, Hexagrammos otakii, Liparis tessellatus, Paralichthys olivaceus. In Yeosu Gyedong, fishes of 44species and 123,926.9 g were caught and the dominant species were Platycephalus indicus, Muraenesox cinereus. In Jangheung Sumoon, fishes of 44 species and 123,926.9 g were caught and the dominant species were Mugil cephalus, Platycephalus indicus, Cynoglossus robustus, Liparis tessellatus. And in Jindo Modo, fishes of 32 species and 171,426.3 g were caught and the dominant species were Platycephalus indicus, Argyrosomus argentatus, Cynoglossus robustus. Therefore, the species composition and abundance of fish by region were very different. These results seem to be related to differences of regional environmental condition, productivity, and fish ecological habits. And the fish catch in four study waters were high from April to July, and the number of fish species and diversity index had a tendency to increased from March to November. The ranges of environmental factors caught fish were $8.3{\sim}28.5^{\circ}C$ in temperature, 26.59~34.92 in salinity and also these factors were correlated to seasonal variation of fish.

• Journal of the Korean Society of Marine Environment & Safety
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• v.10 no.1 s.20
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• pp.61-67
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• 2004

This study described relationships between fluctuation of fishing conditions for common squid and oceanic conditions in the East Sea from 1990 to 1999. Annual catches of common squid have been higher since the late 1980s compared to the period of the late 1970s to the mid-1980s. These catches fluctuations might be related to the effect of regime shifts. Monthly catches of common squid appear the timing of a large catch from September to December and a poor catch from March to May. The monthly catches are also the highest in October and are the lowest in April. Annual stable fishing grounds for coefficient of variation below 1.0 are formed in waters around Guryongpo and Ullung Island Based on optimum water temperature for catch, $16^{\circ}C$, optimum water depth for catch shallow going north. It indicates that the optimum water depth of fishing work different of each area Fishing ground formation and horizontal water temperature appear the minimum $10{\sim}14^{\circ}C$ in April, the maximum $10{\sim}20^{\circ}C$ in October. If seem, that seasonal fluctuation of fishing ground is related to the extension of the Tsushima warm current in the East Sea.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.10a
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• pp.107-108
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• 2001

멸치는 플랑크톤을 주식으로 하고, 산란, 성장 적정수온이 23$^{\circ}C$이상인 난류성이며, 표층 및 중층의 연안을 회유하는 회유어로 군유하는 성질이 있어, 우리나라 연안에서 주로 기선권현망, 정치망, 유자망, 연안 선망 등의 방법으로 어획되고 있는 주요 어종이다. 이들 멸치의 어획량은 1982년 이후 최근까지 매년 큰 변동없이 연간 15만톤에서 20만톤 정도이며, 주로 마른멸치와 젓갈로 가공되고 있다. (중략)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.10a
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• pp.121-122
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• 2001

까나리 (Ammodytes personatus)는 연안성 어류로서 농어목 (Order percifomes) 까나리 과 (Family ammodytidae) 까나리속에 속하며, 우리나라 전 연안, 일본, 알라스카, 시베리아 연안에 분포하고 있고, 바닥이 모래질인 내만이나 연안에서 무리를 지어 생활하며 수온이 15$^{\circ}C$ 이상이 되면 모래 속으로 들어가 여름잠을 자는 냉수성 어류이다. Northern sand lance인 서해안 까나리는 4~6월에 낭장망에 개량안간망으로 어획되어 주로 김장용 액젓의 원료로 이용되고 있다. (중략)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.10a
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• pp.109-110
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• 2001

멸치는 청어목 멸치과에 속하는 어종으로서 몸체가 길고, 원통형이며, 등쪽은 암청색, 배는 은백색을 나타내고 있고, 몸체의 비늘은 탈락하기 쉽다. 또한 멸치는 플랑크톤을 주식으로 하면서 주광성이고, 산란, 성장 적정수온이 23$^{\circ}C$ 이상인 난류성이며, 표층 및 중층의 연안을회유표층 및 중층의 연안을 회유하는 회유어로 군유하는 성질이 있다. (중략)

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.33 no.2
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• pp.97-108
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• 1997

Variation of the catches and fishing grounds, and spawning ecology of Lophius litulon caught by large staw net were investigated from following as ; L. litulon caught through the year, and the peak in catches showed on January in winter, and the lowest catches showed on August in summer. The fishing grounds of L. litulon were located in the Yellow Sea and the East China Sea. And the main fishing ground was formed in the adjacent waters of Ilhyang-cho, where catches and CPUE were more than 50 M/T, 5 kg/haul, respectively, and the range of coefficient of variation(C.V) was 0.6~0.7. The spawning season of L. litulon was on March and April, when spawning area was formed in waters between Ilhyang-Cho and Cheju-Do. The fishing grounds distribution of L. litulon was obviously different with seasonal variation. Namely, in winter, the fishing grounds were mainly formed in the western waters of Cheju-Do, and on March and April( in spawning season), the fishing grounds were densely formed in the adjacent waters of Ilhyang-Cho, and after May, the fishing grounds were widely dispersed towards in the Yellow Sea and the East China Sea with temperature upgrade.

• Korean Journal of Ichthyology
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• v.32 no.3
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• pp.160-165
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• 2020

Seasonal fluctuation in abundance and species composition of fish in coastal waters off Samcheonpo were investigated using seasonal samples collected by a beam trawl in 2019 to compare the variation of species composition and dominant species with previous studies. A total of 6,518 fish were sampled and classified into 44 species, 30 families, and 6 orders. The dominant species were Nuchequula nuchalis (1,542 individuals, 23.7%), Platycephalus indicus (529 individuals, 8.1%), Thryssa kammalensis (437 individuals, 6.7%), Argyrosomus argentatus (403 individuals, 6.2%), and Acanthogobius flavimanus (354 individuals, 5.4%). The highest number of individuals was found in July (2,385 individuals), while the lowest number of individuals was found in January (925 individuals). The diversity index was the highest in April (H'=2.733) and the lowest in July (H'=2.546).

• Proceedings of KOSOMES biannual meeting
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• 2008.05a
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• pp.143-145
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• 2008

Squid catch in the East Sea has annual, 3-5 years and decadal periodicity. Position of main fishing ground depend on the pattern of the Tsushima Warm Current. Marine environment in spawning ground has close correlation with the variation of squid catch in the East Sea.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.28 no.4
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• pp.337-346
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• 1992

Hydroacoustic surveys were conducted in the East China Sea, in the summers of 1990-1991 to investigate the distribution and migration behavior of fish, such as the diel changes in the distributions of fish, the thermoselection behavior of fish, and the fish reactions to a surveying vessel. The hydroacoustic observations were taken with a scientific echo sounder operating at 50kHz and a microcomputer-based echo processor. Fish samples were collected by bottom trawling and temperature was measured with a DBT system. The patterns of fish distributions were compared with the vertical profiles of water temperature. The results obtained can be summarized as follows: 1. The time series of hydroacoustic observations on the downward migration at dawn in the central region of East China Sea showed that the migration rate was 0.24 m/min. In this region, most of the fish collected by bottom trawling during the surveys were squid (Photologio edulis f. budo) and horse mackeral (Trachurus japonicus). 2. The hydroacoustic observations, which together associated with temperature data, indicated that squid and horse mackeral concentrated nocturally in a narrow vertical band of thermocline, particularly in summer when the survey region was strongly stratified. This result suggest that the nocturnal vertical distribution of these species evidently is controlled by temperature. 3. When the survey vessel, that is running at a speed of 11 knots, has suddenly stopped, the fish which concentrated beneath the transducer showed a strong avoidance reaction in the form of rapid downward migration. After a few minutes, the descending reaction disappeared and the fish slowly began the upward migration toward their original swimming positions. Trawl data suggest that the fish, which showed the avoidance reaction, was Liparis tessellatus.

• Korean Journal of Ichthyology
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• v.20 no.4
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• pp.291-302
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• 2008

Seasonal variation of species composition in the coastal waters off Wangdol-cho were investigated using the catches by gill net and trammel net from 2002 to 2004. A total of 58 species was collected and classified into 15 orders and 34 families. Of the 58 species identified, Scorpaeniformes and Perciformes accounted for 62.1% of the species. 35 species in 11 orders and 22 families were collected by gill net and 51 species in 15 orders and 30 families were collected by trammel net. The number of species was high in summer and autumn and lowest in winter. Catches were correlated with sea water temperature. The numbers of individuals and their biomass were 5,295 inds. and 1,890 kg, with the highest values achieved in summer and the lowest in spring. The most dominant species were Pleurogrammus azonus and Gadus macrocephalus. The seasonal species community showed a high similarity between summer and autumn.