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음향 자료를 이용한 하계 여수 바다목장 해역에서 어군의시, 공간 분포와 특징
윤은아 ( Eun A Yoon ),황두진 ( Doo Jin Hwang ),김호상 ( Ho Sang Kim ),이경선 ( Kyung Seon Lee ) 한국수산과학회 2014 한국수산과학회지 Vol.47 No.3
This study assessed dominant fish species, and the characteristics and spatio-temporal distribution of fish schools using acoustic and catch data in the marine ranching area (MRA) of Yeosu in July and August 2013. Acoustic data were collected using a 200-kHz dual beam transducer, and catch data were analyzed through auction data generated by a set net installed in the MRA. More fish schools were detected by acoustic methods in July than in August. The temporal distribution of fish schools differed between July and August, but, many schools demonstrated a high mean volume scattering strength (SV) around artificial reefs. Additionally, the characteristics of fish schools detected by echograms and the species caught by set nets differed between July and August. The dominant fish species were Engraulis japonicus Pampus argenteus, Scomberomorus niphonius, and Pampus echinogaster in July, and approxi-mately 85% of the catch in August consisted of Scomberomorus niphonius. Therefore, hydro-acoustic tools are use-ful for estimating fish school characteristics in large areas over a short period. To determine species, it is important to conduct net sampling surveys during the acoustic surveys. However, if a database of fish school characteristics organized by species is constructed through continuous study, it could be possible to identify fish species through acoustic methods alone.
주파수 70 kHz를 이용한 보름달물해파리의 유영 자세각과 박동에 따른 초음파산란강도
윤은아 ( Eun A Yoon ),황두진 ( Doo Jin Hwang ),( Miyuki Hirose ),( Kouichi Sawada ),( Yoshiaki Fukuda ),( Tohru Mukai ) 한국수산해양기술학회 2015 수산해양기술연구 Vol.51 No.3
Target strength (TS) information is an important parameter that estimates the detection, distribution, and abundance of Aurelia aurita. In order to investigate the biological TS of jellyfish, some factors such as size (bell diameter), tilt angle, pulsation, and symbion should be known. In the ex situ TS measurements, the tilt angles and pulsation from synchronized swimming behavior of four live A. aurita (bell diameters in the air: 54.2 ~ 94.2 mm) were measured with the acoustic data at 70 kHz. The reduced target strength (RTS) of A. aurita was found to change ranged from 13.4 ~ 16.5 dB according to the incidence angles from -30° to 24°. When the change rate of bell diameter in the water was 0.2, the TS value showed a 7.2 dB change. These results could be utilized as an important data to understand the acoustic characteristic scattering of A. aurita.
동중국해에서 해양환경 변화에 따른 노무라입깃해파리의 연간 출현 변동 파악
윤은아 ( Eun A Yoon ),차철표 ( Cheol Pyo Cha ),황두진 ( Doo Jin Hwang ),윤양호 ( Yang Ho Yoon ),신형호 ( Hyeong Ho Shin ),곽두성 ( Du Seong Gwak ) 한국어업기술학회 2012 수산해양기술연구 Vol.48 No.3
The Nemopilema nomurai a very large jellyfish that has been found in the East China Sea and is now are migrating to Korea and Japan. To investigate the occurrence of N. nomurai based on the changing marine environment of the East China Sea, we conducted field survey in the early summer from 2006-2008. We observed the marine environment using CTD and the occurrence of N. nomurai using FMT and bottom trawling. We caught the most N. nomurai in 2007 and the fewest in 2008 and environment factors influencing its are more sensitive temperature than salinity. Large quantities of N. nomurai with a small bell diameter were caught in 2007 and large individuals with a significant bell diameter were caught in 2008. This appeared which between the catch and bell diameter of N. nomurai had (-) correlation (R〓-0.988, p 〓0.098). Meanwhile, the spatial distribution of N. nomurai concentrations in lower salinity mixed seawater inflow in Changjiang Diluted Water.
동중국해에서 노무라입깃해파리의 in situ음향산란특성
윤은아 ( Eun A Yoon ),황두진 ( Doo Jin Hwang ),신형호 ( Hyeong Ho Shin ),곽두성 ( Du Seong Gwak ),차철표 ( Cheol Pyo Cha ) 한국어업기술학회 2012 수산해양기술연구 Vol.48 No.3
The Nemopilema nomurai is a large jellyfish attaining a weight of 200 kg and bell diameter of 2 m when fully grown. To prevent damage to this species, this study determined the acoustic characteristics of N. nomurai using frequencies 38 and 120 kHz. The CPUE of N. nomurai and the averaged SV of 38 and 120 kHz had a lower (+) correlation coefficient and relationship at 120 kHz (R〓0.51) than at 38 kHz (R〓 0.15) was significant. In addition, the averaged SV at 120 kHz was higher than at 38 kHz. The DMVBS120-38 in section catches≥97.8% wet mass of N. nomurai was -2.2 to 5.6 dB. The DTS120-38 in situ TS was extracted in sections catches of only N. nomurai by FMT. It was found that the averaged in situ DTS120-38 were at 0.6 and 0.1 dB. Furthermore, it results showed a close relationship between the bell diameter and TS of N. nomurai. The dominance of smaller N. nomurai (11.0~20.0 cm bell diameter in the air) corresponded to a similar proportion of low TS values (-69.0~-65.0 dB). A small number of larger N. nomurai (25.0~ 38.0 cm bell diameter in the air) were collected, in which TS values were the highest (-62.0~-58.0 dB).
윤은아(Eun-A Yoon),타카노 아유미(Ayumi Takano),이민우(Min-Woo Lee),최슬기(Seul-Gi Choi),황두진(Do-Jin Hwang) 전남대학교 어업기술연구소 2014 어업기술연구소보고지 Vol.7 No.1
The global warming increased the temperature on the sea surface and consequently, jellyfish numbers rapidly have been increasing. Especially toxic Nemopilema nomurai increased in our coast and gave a lot of damage. To reduce damage, we have to know of distribution the biomass of the jellyfish. In recent years, to identify biomass distribution of the jellyfish, acoustic technology has been extensively used. This acoustic assessment is required for precise estimate of target strength (TS) of a jellyfish. Among methods to estimate TS, theoretical scattering model method is generally dependent on the sound speed contrast (h) and density contrast (g) of jellyfish. So, we measured sound-speed contrast and density contrast of the large jellyfish Nemopilema nomurai. This experiment was carried out by separating umbrella and oralarm. The sound-speed contrast was measured by using the time-of-flight method and the density contrast was measured by using volume-mass method. The measured sound-speed contrast varied between 0.9977 and 1.0027 (mean 1.0005) in umbrella and between 0.9957 and 1.0014 (mean 0.9985) in oralarm. The measured density contrast varied between 0.9878 and 0.9981 (mean 0.9930) in umbrella and between 1.0029 and 1.0060 (mean 1.0044) in oralarm. There was a difference in sound speed contrast and density contrast of umbrella and oralarm of Nemopilema nomurai.
윤은아(Eun-a Yoon),이민우(Minwoo Lee),최슬기(Seulgl Chol Lee),신은섭(Eunseob Shin),신희애(Heeae Shin),황승희(Seung hei Hang),황두진(Doojin Hwang) 전남대학교 어업기술연구소 2015 어업기술연구소보고지 Vol.8 No.1
This study was aimed to identify the marine acoustic environment characteristics around Naro Space Center. Regarding marine environment, water temperature, salinity, sound speed, sediment and water depth were measured and noises were measured as air noises and underwater noises. Water temperatures in study area was about 22℃, salinity is about 32 psu, and sound speed was about 1524 m/s. Surface layer and lower layer didn"t show significant differences. And water depth was 7~23 m and the sediment was composed mostly with mud. The average of air noises showed 46~50 dB(A). Underwater noise was about 130~150 dB/Pa and it showed lower values as the water depth became deep.
고흥 외나로도 연안에서 자망, 통발, 주낙에 어획된 어족생물의 종조성 및 어획량 변동
윤은아,황두진,민은비,조남경,한영민,YOON, Eun-A,HWANG, Doo-Jin,MIN, Eunbi,CHO, Nam-Kyung,HAN, Yeoung-Min 한국수산해양기술학회 2017 수산해양기술연구 Vol.53 No.3
The species composition and variation in abundance of fishery resources near Oenarodo, Go-heung Peninsula, Korea, were investigated by gill net, trap net, and longline in May, July, and October 2015 and 2016. During the study period, the total catch included 14 species in the gill net, 11 species in the trap net, and 4 species in the longline. The dominant species were Portunus trituberculatus and Raja pulchrain the gill net, Charybdis japonicaand and Octopus vulgarisin in the trap net, and Muraenesox cinereusin in the longline. The Catch Per Unit Effort (CPUE) per individual and per weight in the gill net were similar in May and July of 2015 and 2016. In October 2015, the CPUE per individual was 2.1 ind./h and the CPUE per weight was 505 g/h higher than the results in 2016, but there was no significant difference in the total CPUE between 2015 and 2016. In the trap net, the CPUE per weight was similar in both 2015 and 2016, but the CPUE per individual was 2.7 ind./h higher in October 2015 than in October 2016 and the total CPUE was not significantly different from 2015 to 2016. The CPUE per individual and weight in the longline were significantly higher in July and October 2015 than in the same months of 2016, but the total CPUE in 2015 and 2016 did not show a significant difference.
어군탐지기를 이용한 여수 바다목장 해역에서 어군의 시ㆍ공간 분포
윤은아(Eun-A Yoon),타카노 아유미(Ayumi Takano),심승보(Seung-Bo Sim),이승재(Seung-Jae Lee),황두진(Doo-Jin Hwang) 전남대학교 어업기술연구소 2014 어업기술연구소보고지 Vol.7 No.1
This study aims at assessment of the dominant fish species, and spatio-temporal of fish schools using acoustic and catch data around the marine ranching area (MRA) of Yeosu in August 2013. A acoustic data was collected using a 200 ㎑ dual beam transducer, and catch data was analyzed through set net, bottom gill net, and trap. The surface temperature and salinity were 21.6~25.2℃ and 31.2~32.6 ppt, respectively in survey area. The fish schools are higher distributed coast than open sea and are demonstrated a high around artificial reefs. The dominant fish species were Scomberomorus niphonius, Trichiurus lepturus, Scomber japonicus, Chelidonichthys spinosus, and Parapercis sexfasciata.
수중 음향 기법을 이용한 인공어초에 서식하는 어류의 행동 특성
윤은아 ( Eun A Yoon ),황두진 ( Doo Jin Hwang ),김호상 ( Ho Sang Kim ),이승주 ( Seung Jong Lee ),이경선 ( Kyung Seon Lee ) 한국어업기술학회 2014 수산해양기술연구 Vol.50 No.2
We aimed to assess the behavior characteristics of fish on an artificial reef using hydroacoustic techniques. The acoustical survey was conducted with a 200 kHz dual beam transducer while fishing on the stone combination reef of Uljin. A school of fish were detected on the artificial reef before sunset and floated on the artificial reef at 30 minutes after sunset. The density (Nautical Area Scattering Coefficient, NASC) of fish that floated on the artificial reef after sunset was about 600 m2/nmi2; similar observations (about 50 m2/nmi2 or less) were noted after 19:00 hours. Fish caught by fishing on the artificial reef were Sebastes schlegeli, Hexagrammos otakii, Sebastes thompsoni, and Conger myriaster. Resultantly, we demonstrated that hydroacoustic techniques are useful for detecting behavior characteristics of fish in the artificial reef. Such results can be used for basic data to estimate the install effect of the artificial reefs.
윤은아(Eun-A Yoon),타카노 아유미(Ayumi Takano),김용갑(Yong-Kab Kim),이단비(Dan-Bi Lee),정나리(Na-Ri Jung),김완기(Wan-Ki Kim),황두진(Doo-Jin Hwang) 전남대학교 어업기술연구소 2013 어업기술연구소보고지 Vol.6 No.1
Hydro-acoustic survey was used to analyze spatio-temporal distribution of fish school in the artificial reef area. The survey was carried out in Uljin on east coast of Korea in 22-23 September 2012. A track survey was setting 9 research lines where artificial reef area. The survey system was set up with GPS system (GP-50, Furuno), transducer (DT-5000, BioSonics), quantitative echo sounder and echoview (3.00 Myriax). As a result, spatio-temporal distribution of fish school where artificial reef area are spread on coast at afternoon-sunset, dawn-sunrise and morning and in the whole sea at night. The density of fish schools are highly distributed on the basis of time in order of dawn-sunrise, night, morning and afternoon-sunset. The fish school are distributed 20-25 m at afternoon-sunset, 5-20 m at night, 0-15 m at dawn-sunrise and 0-10 m at morning. Moreover, this survey result can be used as an information to evaluate marine resources inhabiting in the sea around artificial reef.