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수산음향기법의 주파수에 따른 남해안의 어류의 군집 및 공간분포 특징
황강석 ( Kangseok Hwang ),박정호 ( Jeong-ho Park ),이정훈 ( Jeonghoon Lee ),차형기 ( Hyung-kee Cha ),박준성 ( Junseong Park ),강명희 ( Myounghee Kang ) 한국어업기술학회 2016 수산해양기술연구 Vol.52 No.4
Properties of aggregation and spatial distribution of fish were examined based on three lines in the South Sea of Korea using three frequencies (18, 38, and 120 kHz) of a scientific echosounder. The vertical distribution of fish was displayed using acoustic biomass namely nautical area scattering coefficient (NASC). As a result, at 120 kHz high NASC showed from water surface to 20 meters in deep while at 18 and 38 kHz very high NASC presented in 70 ~ 90 meters in depth, especially at line 3. Among three lines, the line 2 had lowest NASC. The horizontal distribution of fish using three frequencies together exhibited high NASC between the eastern South Sea and center of South Sea. In especial, NASC (801 ~ 1,920 m<sup>2</sup>/n·mile<sup>2</sup>) was observed along coastal waters from Busan to Tongyeong, Geoje, and Namhae. In regard with the property of aggregation of fish schools, the volume back-scattering strength (SV) of three lines presented close each other, however, the range of S<sub>V</sub> in the line 2 was shortest (-53.5 ~ -43.4 dB). The average distributional depth was deep in the order of L3 (32.8 ± 9.0 m), L1 (45.2 ± 9.5m), L2 (49.7 ± 5.6 m). The average altitude was high in the order of L3 (13.4 ± 10.3 m), L1 (17.0 ± 12.6 m), L2 (56.7 ± 5.6 m). The average length, thickness, and area were large in the order of L1, L3, and L2. This means that small sized fish schools were distributed near water surface in the line 2 while relatively large and similar sized fish aggregations between line 1 and line 3 appeared however, fish schools at line 3 had lower distributional depth and smaller compared to those at line 1. Acoustic data were visualized for demonstrating the entire circumstances of survey area. Additionally, there was no correlation between acoustic and trawl results.
황강석 ( Kangseok Hwang ),윤은아 ( Eun A Yoon ),이경훈 ( Kyounghoon Lee ),이형빈 ( Hyungbeen Lee ),황두진 ( Doo Jin Hwang ) 한국수산해양기술학회 2015 수산해양기술연구 Vol.51 No.3
This study was focused on acoustic scattering characteristics of jack mackerel (Trachurus japonicus) at frequency 38, 70, and 120 kHz by Kirchhoff-ray mode (KRM) model. The body length (BL) of 16 individuals ranged in 12.2~22.0 cm (mean±S.D.: 17.8±3.2 cm) and the swimbladder length ranged in 4.2~8.6 cm (mean±S.D.: 6.6±1.6 cm) and the swimbladder cross section ranged in 1.7~6.6 cm2 (mean±S.D.: 3.8±1.6 cm2). This result shows that results correlate well between the BL and the length and cross section of swimbladder. The swimbladder angle ranged in 7~12°and the maximum TS values ranged in 16~ 5°at tilt angle. The averaged TS-to-BL relationship were TS38kHz=20log10BL-65.33 (R2=0.66), TS70kHz=20log10BL-65.90 (R2=0.67), and TS120kHz=20log10BL-66.65 (R2=0.65). These results can be used fundamental data in order to estimate distribution and biomass of jack mackerel by using hydro-acoustic method.
음향을 이용한 춘계와 추계에 우리나라 동서남해의 수산자원의 공간적인 분포 및 군집특성 조사
박준성 ( Junseong Park ),황강석 ( Kangseok Hwang ),박준수 ( Junsu Park ),강명희 ( Myounghee Kang ) 한국어업기술학회 2018 수산해양기술연구 Vol.54 No.2
Acoustic surveys were conducted in the seas surround the South Korea (South Sea A, South Sea B (waters around the Jeju Island), West Sea and East Sea) in spring and autumn in 2016. First, the vertical and horizontal distributions of fisheries resources animals were examined. In most cases vertical acoustic biomass was high in surface water and mid-water layers other than South Sea A in autumn and West Sea. The highest vertical acoustic biomass showed at the depth of 70-80 m in the South Sea A in spring (274.4 m<sup>2</sup>/nmi<sup>·2</sup>) and the lowest one was 10-20 m in the West Sea in autumn (0.4 m<sup>2</sup>/nmi<sup>·2</sup>). With regard to the horizontal distributions of fisheries resources animals, in the South Sea A, the acoustic biomass was high in eastern and central part of the South Sea and the northeast of Jeju Island (505.4-4099.1 m<sup>2</sup>/nmi<sup>·2</sup>) in spring while it was high in eastern South Sea and the coastal water of Yeosu in autumn (1046.9-2958.3 m<sup>2</sup>/nmi<sup>·2</sup>). In the South Sea B, the acoustic biomass was occurred high in the southern and western seas of Jeju Island in spring (201.0-1444.9 m<sup>2</sup>/nmi<sup>·2</sup>) and in the southern of Jeju Island in autumn (203.7-1440.9 m<sup>2</sup>/nmi<sup>·2</sup>). On the other hand, the West Sea showed very low acoustic biomass in spring (average NASC of 1.1 m<sup>2</sup>/nmi<sup>·2</sup>), yet high acoustic biomass in the vicinity of 37 N in autumn (562.6-3764.2 m<sup>2</sup>/nmi<sup>·2</sup>). The East Sea had high acoustic biomass in the coastal seas of Busan, Ulsan and Pohang in spring (258.7~976.4 m<sup>2</sup>/nmi<sup>·2</sup>) and of Goseong, Gangneung, Donghae, Pohang and Busan in autumn (267.3-1196.3 m<sup>2</sup>/nmi<sup>·2</sup>). During survey periods, fish schools were observed only in the South Sea A and the East Sea in spring and the West Sea in autumn. Fish schools in the South Sea A in spring were small size (333.2 ± 763.2 m<sup>2</sup>) but had a strong SV (-49.5 ± 5.3 dB). In the East Sea, fish schools in spring had low SV (-60.5 ± 14.5 dB) yet had large sizes (537.9 ± 1111.5 m<sup>2</sup>) and were distributed in the deep water depth (83.5 ± 33.5 m). Fish schools in the West Sea in autumn had strong SV (-49.6 ± 7.4 dB) and large sizes (507.1 ± 941.8 m<sup>2</sup>). It was the first time for three seas surrounded South Korea to be conducted by acoustic surveys to understand the distribution and aggregation characteristics of fisheries resources animals. The results of this study would be beneficially used for planning a future survey combined acoustic method and mid-water trawling, particularly deciding a survey location, a time period, and a targeting water depth.
김성태(Sung-Tae KIM),황강석(Kangseok HWANG),박규진(Gyu-Jin PARK),최창근(Chang Geun CHOI) 한국수산해양교육학회 2016 水産海洋敎育硏究 Vol.28 No.1
A subtidal marine benthic algal vegetation at Ulleungdo Island, the eastern coast of Korea was investigated to clarify the community structure and vertical distribution by quadrat method at seven stations in May and August 2014. The total number of marine algal species was 148 species composed of the green algae of 12 species, the brown algae of 40 species and the red algae of 96 species. Mean biomass in dry weight was 94.8 g dry weight m<SUP>-2</SUP> in study sites, 98.1 g dry weight m<SUP>-2</SUP> in upper tidal level, and 86.6 g dry weight m-2 in middle level. The R/P and (R+C)/P value reflecting flora characteristic were 1.9 and 2.3, respectively. Three groups produced by cluster analysis, one including sites Neunggeol, Daepung, Jukdo, second including sites Gongam, Ssangjeongcho and the other including sites Gwaneum, Hangnam, showed meaningful difference in similarity (about 40%), each other. The number of marine algal species and biomass in Ulleungdo Island area were markedly reduced comparing that in the previous studies. This result may suggest probably change of algal vegetation in future, considering the physical and chemical pollutions loaded in the coastal marine environment of this area.
음향 실험 및 모델 기법을 이용한 도루묵 (Arctoscopus japonicus)의 음향산란반사강도 특성
이형빈 ( Hyungbeen Lee ),이경훈 ( Kyounghoon Lee ),윤은아 ( Eun A Yoon ),황강석 ( Kangseok Hwang ),최정화 ( Junghwa Choi ),박태건 ( Tae Geon Park ) 한국수산해양기술학회 2015 수산해양기술연구 Vol.51 No.3
Acoustic target strength (TS) measurement and theoretical acoustic scattering models were applied to estimate the TS for assessing the fish biomass. TS measurement was made of ex situ sailfin sandfish Arctoscopus japonicus at 70 and 120 kHz, and then compared to backscatter model prediction. The live sandfish was tethered in seawater using monofilament lines. Measurements were made versus incidence angle, -50° to 50° relative to dorsal aspect directions. Distorted wave Born approximation (DWBA) model was used to calculated TS pattern. The TS values of sandfish (body length: 16.2 cm) at 70 and 120 kHz were -66.94 dB and -64.45 dB, respectively, and were about 20 dB lower than TS of other fishes in Korea waters. These TS levels were distributed within the range of the theoretical TS. Ex situ measurement and theoretical TS may be applied to improve acoustical detection and biomass estimation of the sandfish, and is necessary to measure with various lengths.
한국산 환태평양 볼락속 (Genus Sebastes), Sebastes glaucus의 최초 보고 (쏨뱅이목: 양볼락과)
정문경 ( Moon Kyung Jeong ),지환성 ( Hwan Sung Ji ),김진구 ( Jin-koo Kim ),이수진 ( Sujin Lee ),황선재 ( Seon Jae Hwang ),황강석 ( Kangseok Hwang ),박정호 ( Jeong-ho Park ) 한국어류학회 2016 韓國魚類學會誌 Vol.28 No.4
쏨뱅이목 양볼락과에 속하는 Sebastes glaucus 1개체 (표준체장 276.9 mm)가 독도 북서쪽에서 자망으로 채집되었다. 본 개체는 황갈색 체색, 높은 체고, 전두부와 목덜미 부분은 볼록하고 후두부는 넓다. 또한 14개의 등 지느러미 극조 및 주상악골에 비늘이 없는 것이 특징이다. 우리나라에서 처음 보고되는 환태평양 볼락속인 이 어류의 국명으로 NFRDI (1999)에 따라 “청회볼락”을 제안한다. A single specimen (276.9 mm standard length) of the scorpaenid Sebastes glaucus was collected by a gill net from Dokdo, East Sea, Korea. The specimen is characterized by yellowish brown body color, deep body, convex frontal region and nape, board occipital region, 14 spines at dorsal fin, and no scales at maxilla. This is the first record of S. glaucus in Korea; we therefore add the species to the Korean fish fauna. According to the NFRDI (1999), we propose the Korean name, “Cheong-hoebol- rak” for this species.