음향을 이용한 인공어초 주변의 거리별 어군량 분포조사

송은지(Eun-ji SONG),이태하(Tae-ha LEE),강태종(Tae-jong KANG),민은비(Eun-bi MIN),황두진(Doo-jin HWANG) 전남대학교 어업기술연구소 2022 어업기술연구소보고지 Vol.15 No.1

A marine ranch is a sea area that artificially creates habitats where artificial structures or natural stones can be installed to inhabit and grow. The purpose of this study is to investigate the vertical and horizontal distribution of fish schools by distance around artificial reefs in central Taean using acoustic survey. The survey was conducted on April 27(1st), July 28(2nd), September 30(3rd), and November 17(4th). According to the survey, more fish schools appear in April and July than in September and November, and more fish schools appear at night than during the day. When examining the density of fish schools by distance of 2km, 3km, and 4km from artificial reefs, the frequency of appearance decreased as the distance from artificial reefs increased. As a result, changes in the distribution of fishing schools were found depending on the day and night and the presence or absence of artificial reefs. Data should be collected and stored using sound research equipment WBT, GPS, Transducer, and Notebook, and it is judged that follow-up management and continuous observation of fisheries resource creation projects are necessary.

울주 바다목장 해역의 음향 자원조사법을 통한 어군의 시·공간적 분포

이은찬(Eun-Chan LEE),민은비(Eun-Bi MIN),윤은아(Eun-A YOON),황두진(Doo-Jin HWANG) 전남대학교 어업기술연구소 2018 어업기술연구소보고지 Vol.11 No.1

The purpose of this study was to monitor the spatiotemporal distribution of fish using quantitative echosounding around coastal areas where artificial reefs would be installed for create marine ranching efficiently. The survey was conducted a total of two times at Ulju on 13 June and July 2017 (1st survey), and 7 November 2017 (2nd survey). According to the survey results, the density of fish in June and November was higher at night higher than during the day. The valley of the sea detected much fish. Thus, the distribution of the fish schools changed depending on time of day or night, month, and submarine topography. Therefore, it is thought that the systematic survey should be conducted periodically considering the water temperature salinity and live food as inhabited environments for fish.

부이형 계량 어군탐지기를 이용한 기장 바다목장 해역에 서식하는 어군의 주·야간 연직운동 조사

김민규(Min-Gyu KIM),심규원(Kyu-Won SIM),민은비(Eun-Bi MIN),윤은아(Eun-A YOON),황두진(Doo-Jin HWANG) 전남대학교 어업기술연구소 2019 어업기술연구소보고지 Vol.12 No.1

The purpose of this study was to monitor the daytime, nighttime distribution of fish using buoy echo-sounder around artificial reefs in Gijang coastal areas. A acoustic data was collected using a 50 and 200 kHz dual beam transducer. A total of two surveys were performed in waters of Gijang marine ranching June, and September, 2018. Typically, the fish school showed different distribution density according to daytime, nightime time. Buoy echo sounder is capable of continuous measurement in one place for a long time, so that the daytime and nighttime distribution of fishes around artificial reefs can be grasped.

음향학적 방법(과학 어군탐지기)을 이용한 보름달물해파리(Aurelia aurita) 크기 측정법

한민혁(Min-Hyeok HAN),강태종(Tae-Jong KANG),민은비(Eun-Bi MIN),신중로(Jung-Ro SHIN),황두진(Doo-Jin HWANG) 전남대학교 어업기술연구소 2025 어업기술연구소보고지 Vol.18 No.1

This study investigates the relationship between the bell diameter of the moon jellyfish (Aurelia aurita) and its target strength (TS) using acoustic survey methods. Conducted in the summer of 2024 in Yeosu coastal waters, South Korea, data were collected using an EK80 acoustic system (200 kHz). The results indicate a proportional relationship between bell diameter and TS values, providing significant insights into the acoustic scattering characteristics of marine organisms. This research contributes to marine resource management and the development of advanced acoustic survey techniques.

강원도 대문어(Enteroctopus dofleini )의 지가리(연승 어업)를 활용한 자원량 추정 연구

고은지(Eun-ji KO),강태종(Tae-jong KANG),민은비(Eun-bi MIN),신중로(Joong-ro SHIN),황두진(Doo-jin HWANG) 전남대학교 어업기술연구소 2025 어업기술연구소보고지 Vol.18 No.1

This study conducts a resource estimation of the Enteroctopus dofleini in the coastal waters of Gangwon Province, based on actual catch surveys using the jigging (longline) fishing gear. The research analyzes catch data collected from commercial fishing operations to estimate the population of Enteroctopus dofleini in the study area. By integrating data from the catch surveys, the study aims to provide an accurate assessment of the octopus resource in the region. Additionally, the study evaluates the effectiveness of the jigging gear in resource management and its potential for supporting sustainable fisheries practices. The findings are expected to contribute to the development of effective conservation strategies and fisheries management plans for the sustainable preservation of Enteroctopus dofleini populations in Gangwon Province.

양식장 물김 이송 및 중량 자동측정 시스템 개발의 경제성 분석 연구

김대현,민은비,강태종,황두진,Dae-Hyon KIM,Eun-Bi MIN,Tae-Jong KANG,Doo-Jin HWANG 한국수산해양기술학회 2023 수산해양기술연구 Vol.59 No.2

Laver aquaculture, which occupies a large proportion in the aquaculture industry in Korea, is still highly dependent on human labor. Therefore, it is necessary to study the development of an automatic system to improve the working environment and increase the efficiency of aquaculture production systems. The purpose of this study is to evaluate the economic feasibility of an improved system in a study for the loading-unloading and automatic weighing systems in laver aquaculture industry. Economic analysis of the developed unloading and automatic weighing system were implemented under various conditions to calculate more accurate benefits and costs. As a result of this study, the economic feasibility was found to be very high in the three models: net present value (NPV), benefit-cost ratio (B/C), internal rate of return (IRR). Moreover, the results of sensitivity analysis showed that the economical efficiency of the automatic loading, unloading, and weighing system in laver aquaculture was very high.

음향조사를 이용한 포항 남구 바다목장해역에 서식하는 수산자원의 시·공간적인 분포

김민석(Min-Seok KIM),황준우(Jun-Woo HWANG),민은비(Eun-Bi MIN),윤은아(Eun-A YOON),황두진(Doo-Jin HWANG) 전남대학교 어업기술연구소 2019 어업기술연구소보고지 Vol.12 No.1

The purpose of this research is to investigate the temporal and spatial distributions of fishery resources living in and near artificial fishing banks of marine ranching area in Nam-gu, Pohang through an acoustic survey using a scientific fish finder. The survey was conducted twice in Nam-gu, Pohang on Apr 18 (1st) and Jul 17 (2nd) to investigate the distribution and density of fishery resources. The vertical distribution of the fishery resources was evenly shown across the entire water layers of the target sea area day and night in Apr. They were more distributed in the mid layer in day and night time in Jul. In both Apr and Jul, fishery resources with low acoustic intensity were found, and they were distributed in the deep sea. As for the spatial distribution of fishery resources, they were more distributed in open sea than inland sea of the target sea area in Apr. In Jul, however, they were evenly distributed in the entire sea area, and the density was relatively lower than Apr. As the distribution of fishery resources are different according to day time, night time, water level, season, submarine topography, etc., it requires continuous and systematic observations.

굴 양륙 및 수확을 위한 자동화 시스템의 성능평가

김지은(Ji-eun KIM),강태종(Tae-jong KANG),민은비(Eun-bi MIN),황두진(Doo-jin HWANG) 전남대학교 어업기술연구소 2024 어업기술연구소보고지 Vol.17 No.1

This study analyzed oyster harvesting time, working time, and dropout rate of oyster and coating companies to compare the performance of the sub-guzzling oyster harvesting system and the oyster harvesting system developed by Chonnam National University until recently. The oyster harvesting system in use until recently harvests oysters through manual cutting the sub-guzzling to a certain length during the harvest process. The oyster harvesting system developed by Chonnam National University harvests oysters by using an automated system through a manual process in which sub-guzzling was cut to a certain length. As a result, the harvest time of the developed oyster harvesting system was measured as 12 seconds per year, and 5 hours for working hours and 9 million won for labor costs per fish price. In addition, the dropout rate of oyster shell and coating agent was measured as 98%, which confirmed that the oyster shell and coating agent were completely separated. Therefore, compared to the current oyster harvesting system, the harvesting time and working time developed by Chonnam National University decreased compared to the previous one, and it was confirmed that oyster shell and coating agent were completely separated. It is necessary to continuously evaluate technology development for improving and commercializing oyster quality in the future.

초고압력을 이용한 굴 박신기계에 관한 연구

김옥삼 ( Ok-sam Kim ),민은비 ( Eun-bi Min ),황두진 ( Doo-jin Hwang ) 한국수산해양기술학회 2021 수산해양기술연구 Vol.57 No.4

By applying super-high pressure (150-250 MPa) to a sealed pressure vessel, it is possible to make oyster shucking machine that automatically opens two-sheet shellfish or oysters. Possibility of developing a shucking machine was confirmed by identifying the working pressure for meat of oysters produced in the southern coast and conducting sensory evaluation of meat oysters. As a result of confirming the shucked oysters under super-high pressure of 150 MPa in the pressure vessel, the number of type A with separated shells and well-separated meat was 22 and type B with both shells and internal meat and shells not separated. For the oysters that were treated at 175 MPa, there were 58 type As with shell separated and meat well separated and 42 type Bs without oyster shells and insides. When looking at the oysters shucked at 200 MPa in the pressure vessel, the number of type A was 86 and type B was 14 accounting for 86% of oysters with good marketability. As a result of shucking oysters by applying 250 MPa, 96% type A oysters and 4% type B oysters were obtained from the total specimen. The total specimen oyster weight used in the conducted experiment was 6 kg, the average oyster shell weight was 3.99 kg and the average oyster meat weight was 1.25 kg. Therefore, the fatness of oyster meat, which measures the added value of oysters, is 20.8%. Sensory evaluation was conducted on thinned oysters by hand and type A oysters shelled by machine with an operating pressure of 200 MPa. The hand-worked oyster sample scored 4.7 points only in salty taste, and scored 5.0 or higher in color, shape, smell, fishy taste, texture and preference.

나로도 연안해역에 서식하는 수산생물의 계절별 종조성 및 어획량 변동

지동인(Dongin JI),민은비(Eun-bi MIN),윤은아(Eun-a YOON),황두진(Doojin HWANG) 전남대학교 어업기술연구소 2018 어업기술연구소보고지 Vol.11 No.1

Seasonal variation in catch-per-unit-effort (CPUE), species composition, and size frequency distribution of major fish species were analyzed for gill net, trap net, and long line fishing gear in the Korean coastal area of Go-heung in 2017. The dominant fish species were Raja pulchra for gill nets, Octopus vulgaris for trap nets and Muraenesox cinereus for long lines. Seasonal catch was the greatest in July and the least in March. Catch according to type of fishing gear was the highest for trap nets and the lowest for gill nets. The dominant species are similar to seasonal biological properties. Species compositions did not vary greatly between seasons. The catch per unit effort according to type of fishing gear was the greatest for gill nets and trap nets in July and for long lines in May. Gill nets, trap nets, and long lines had the lowest in March. The catch per unit effort based on the number of fish catch was the greatest for trap nets in March and long line appears the lowest, with long line was the highest. The CPUE for gill nets was the lowest in May, July, and October. The catch per unit effort based on the weight of the fish catch was similar to the catch per unit effort based on the number of fish caught.