• 수산해양기술연구
• /
• 제51권4호
• /
• pp.583-591
• /
• 2015

The coastal stow net (stow net hereafter) in Korea is one of the major fishing methods for yellow croaker (Larimichthys polyactis), ribbon fish (Trichiurus lepturus), and anchovy (Engraulis japonicus). In terms of energy efficiency, the stow net fishery is more competitive than towing fishing gears such as trawl gears. The fishing vessels in stow net fishery have consumed less fossil fuel and also have had less carbon dioxide emission into the atmosphere. however, the stow net fishery is necessary to be regulated due to its increased output of the fleet. Therefore, it is required for fisheries authorities to manage the fishing capacity or fishing power for the assurance of fishery's sustainability. For fisheries management authorities, it is necessary to quantify data related to fishing capacity and fishing power to deploy fishery policy in a sustainable way. In terms of data for decision-making, Data envelopment analysis (DEA) method was conducted to estimate fishing capacity. Fishing power index (FPI) was also applied to calculate relative fishing power to approach the problem in a quantitative way.

• 수산해양기술연구
• /
• 제57권4호
• /
• pp.316-333
• /
• 2021

In order to understand basic data for improving the fishing system and fishing vessel structure in coastal improved stow net fishery, a questionnaire survey and on-site hearing were conducted from May 10 to June 11, 2019 to analyze opinions on the improvement of operation status and fishing vessel structure. The questionnaire survey consisted of ten questions on the operation status of coastal improved stow net fishery and six questions on the improvement of fishing vessel structure, and the results of each question were analyzed by the region, the captain's age, the captain's career and the age of fishing vessel. As a result of analyzing opinions on the operation status of the coastal improved stow net fishery, it was found that the average time required for casting net was 32.8 to 33.0 minutes and that the average time required for hauling net was 41.0 to 42.2 minutes which took 10 to 12 minutes more than for casting net. The most important work requiring improvement during fishing operation (the first priority) were 'hauling net operation,' 'readjustment and storage of fishing gear,' and 'fish handling' and the hardest factor in fishing management were in the order of 'reduction of catch,' 'labor shortage' and 'rising labor costs.' The most institutional improvement that is most needed in coastal improved stow net fishery was an 'using fine mesh nets.' Most of the respondent to the questions on the experience in hiring foreign crews was 'either hiring or willing to hire foreign crews,' and the average number of foreign crews employed was found to be 2.3 to 2.4 persons. The most important reason for hiring (or considering employment) foreign crews was 'high labor costs.' The degree of communication with foreign crews during fishing operation were 'moderate' or 'difficult to direct work.' The most important problem in hiring foreign crews (the first priority) was an 'illegal departure.' As the survey results on the opinion of structural improvement of coastal improved stow net fishing vessel, the degree of satisfaction with fishing vessel structure related to fishing operation was found to be somewhat unsatisfactory, with an average of 3.3 points on a five-point scale. The inconvenient structure of fishing vessel in possession (the first priority), the space needed most for the construction of new fishing vessel (the first priority) and the space considered important for the construction of new fishing vessel (the first prioprity) was a 'fish warehouse.' The most preferred equipment for the construction of new fishing vessel were 'engine operation monitoring' and 'navigation safety devices.' The average size (tonnage class), the average horse power and the average total length of fishing vessel for proper profit and safety fishing operation was between 13.8 and 14.0 tonnes, 808.3 to 819.5 H.P. and 23.4 to 23.5 meters, respectively. The results of the operation status of coastal improved stow net fishery and the requirement for improving the fishing vessel structure are expected to be provided as basic data for reference when we build or improve the fishing vessel.

• 수산해양기술연구
• /
• 제57권1호
• /
• pp.57-68
• /
• 2021

In order to collect basic data for the improvement of fishing systems in coastal improved stow net fishery, a questionnaire survey and on-site hearing were conducted from May 10 to June 11, 2019 on the basic items of coastal improved stow net fishery and safety accidents that occurred during fishing operation. The questionnaire for the survey on the actual conditions of coastal improved stow net fishery consisted of a survey on basic matters (six questions) and a questionnaire (six questions) on safety accidents occurring during fishing operation. The results of the survey on basic items were analyzed by region (Incheon, Seocheon, Gunsan and Mokpo), by the captain's age (less than 50 years of age, 50 to 60 years and more than 60 years of age), by the captain's career (less than 20 years, 20 to 30 years, 30 to 40 years and more than 40 years) and by the age of fishing vessel (less than 10 years, 10 to 20 years and more than 20 years). According to the survey on basic items of coastal improved stow net fishery such as the captain's age, the captain's career, the age of fishing vessel, the fishing nets in use, the crews on board and the operation days per voyage by region, the average captain's age was 55.7 years, the average captain's career was 20.5 years, the average age of fishing vessels was 9.0 years, the average numbers of nets used by fishing boats was 14.0 sets, the average numbers of crew on board a fishing boat was 4.4 persons and the average numbers of operation days per voyage was 4.9 days (p < 0.05). As a result of the survey on safety factors during fishing operations, such as experience of ship accidents, major causes of ship accidents experienced, causes of ship accidents (first priority), experience of human accidents, major causes of human accidents, and causes of human accidents (first priority), more than 96% of the respondents experienced ship accidents including collisions with other vessels or fishing gear during fishing operations. The most significant cause of the accident was the other's fishing gear installed in the fishing grounds. The first possible causes of ship accidents during fishing operations were found to be other fishing gear installed in fishing grounds, steering or engine failure, and inability to avoid accidents during casting and hauling nets. The survey of the experience of human accidents, such as injuries or sea falls, showed that more than 90% of the respondents experienced human accidents during fishing operations. The most important cause of accidents experienced during fishing operations was stucked in a fishing gear during casting and hauling nets. The first important causes of accidents during fishing operations were movement of the fishing gear during casting and hauling nets, damage of the fishing gear such as rope cutting. The results are expected to be provided as a basic data to prevent safety accidents occurring during fishing operation and improve the fishing system in the coastal improved stow net fishery.

• 한국수산과학회지
• /
• 제47권6호
• /
• pp.1037-1054
• /
• 2014

In this study, the status of coastal fisheries was examined based on the catch and number of fishing vessels of coastal fisheries in Korea. Comparing the status on coastal fisheries of the East Sea, Yellow Sea and South Sea in Korea, scientific evidence was made for fisheries management on coastal fisheries based on characteristics of each sea area. From 1990 to 2011, the catch of coastal fisheries in Korean waters ranged from 150,000 mt to 230,000 mt, with an average of 190,000 mt, and it accounted for 15% in average of total catch fished in adjacent waters of Korea. In order of catch by coastal fisheries, gillnet (36.7%) was the primary fishery, followed by coastal complex (24.7%), stow net (18.3%), trap (12.9%), lift net (3.9%), purse seine (3.0%) and beam trawl (0.4%) fisheries. In order of catch by species, anchovy (15.0%) had the largest proportion of total catch, followed by common squid (10.3%), akiami paste shrimp (5.2%), blue crab (3.9%) and octopus (3.7%). Of the average catch by sea area from 1990 to 2011, Yellow Sea, South Sea and East Sea were 37.4%, 34.6% and 28.0%, respectively. Since 2000s, however, the average catch of South Sea has accounted for the largest proportion. The number of permitted fishing vessels involved in 8 coastal fisheries was 55,336 vessels in average from 1997 to 2011. The number of vessels was about 47,000 vessels in 1997, and increased to 61,300 vessels until 2000, then has decreased to 44,000 vessels operating in 2011. In order of the number of permitted fishing vessels by fisheries, complex (52.4%) took the first place, followed by gillnet (31.5%), trap (13.4%), stow net (0.8%), beam trawl (0.8%), purse seine (0.6%), lift net (0.4%) and seine net (0.0%). In order of the number of permitted fishing vessels by sea area, South Sea (29,994 vessels) took the first place, followed by Yellow Sea (18,185 vessels) and East Sea (7,158 vessels). In order of the catch per unit effort (CPUE, mt/vessels) which was analyzed using catch and number of vessels in average by fishery, stow net is the highest followed by lift net, trap, purse seine, gill net, beam trawl and complex fisheries. In particular, the CPUE of complex and gill net fisheries, which accounted for the largest number of vessels were 4.0 mt/vessels and 1.6 mt/vessels, respectively. Since those are too low relative to other fisheries, it was judged to need systematical management on both fisheries.

• 한국해양바이오학회지
• /
• 제13권2호
• /
• pp.66-75
• /
• 2021

In 2014, fishes caught using stow nets in coastal waters off Gochang from May to October were assessed for appearance patterns. The fishes were caught at four research stations (St.) and were found to comprise 37 species, 18 families, and 7 orders. The dominant species were Thryssa kammalensis, Setipinna tenuifilis, and Sardinella zunasi. To gain a measure of their biodiversity, all species were assessed for their number, richness, diversity, evenness, and dominance. The highest and lowest numbers of total fishes caught were recorded in September (4,819 individuals) and October (828 individuals), respectively. The diversity was the highest in October (H' = 2.478) and lowest in June (H' = 0.880). The evenness index was the highest in October (E = 0.780) and lowest in June (E = 0.343). The richness index was the highest in October (R = 3.424) and lowest in May (R = 1.552). Finally, the dominance index was the highest in June (D = 86.2%) and lowest in October (D = 40.3%).

• 수산경영론집
• /
• 제53권1호
• /
• pp.1-16
• /
• 2022

This paper aims to propose a new systematic approach to analyze the factor productivity and to investigate those characteristics of factor productivity in operational and managerial perspectives. The Cobb-Douglas production function is adopted to estimate the labor and capital productivity. In estimating those productivities the data of The Research on the Actual Condition of Coastal Fisheries (RACF), especially those of Jeon-Nam Province are used. The statistical analysis of RACF data shows that the characteristics are a little bit different between labor and capital of the operational equipment in the coastal fisheries. The Cobb-Douglas type production function is useful in estimating the factor productivity, especially in case of 'coastal Stow-net fishery' even though the limited data is used. However, in case of 'trap fishery,' the Cobb-Douglas production function appears to have some limitations in estimation. This implies that estimating the factor productivities in fisheries employing broad perspectives and various methods are needed.

• 수산해양교육연구
• /
• 제8권1호
• /
• pp.92-107
• /
• 1996

1982~1989년간의 연안어업 자원조사 보고서, 1993년 연안어업의 자원이용 실태 평가 보고서와 설문조사한 자료 등을 이용하여 연안 낭장망어업의 어획성능과 소형어의 혼획실태 및 남획의 대처방안에 대하여 연구한 결과를 요약하면 다음과 같다. 1. 낭장망어업의 허가처분 실태는 1993년도에는 연안어업 873건, 구획어업 146건이었으나 1994년 수산업법이 개정된 이후에는 연안어업 757건, 구획어업 302건으로 연안어업 건수가 감소된 반면 구획어업 건수는 증가하였다. 2. 낭장망어업의 경영체당 순이익은 1991년도를 기준으로 할 때, 안강망과 해선망에 비교해서 훨씬 높은 수준에 있다. 3. 통당어획량은 1982년부터 1989년까지에서는 점차 증가하였으나, 1990년 이후에는 점차 감소하는 경향이었다. 4. 어종별 혼획율은 큰 변동이 없었으며, 지역별로는 서해안인 경기, 충남지역에서는 새우류 및 배도라치의 혼획율이 높았으며 남해안인 전북, 전남, 경남지역에서는 멸치와 배도라치의 혼획율이 높게 나타났다. 5. 소형어의 어종별 혼획율은 까나리, 멸치, 밴댕이, 배도라치 등은 각각 89.6%, 69.4%, 63.4%, 51.2%로 높게 나타났으나 새우류는 꽃새우 21.7%, 젓새우 18.8%로 적게 나타났다. 6. 월별 혼획율은 멸치, 밴댕이등은 4월과 8~11월에 높았으며 새우류는 4월과 9월에 높게 나타났다. 7. 낭장망어업에 의하여 어획되고 있는 소형어 남획의 대처 방안으로서는 소형어가 가장 많이 어획되는 시기인 4월과 8~11월에는 조업회수를 줄이는 방법, 소형어가 그물코를 통과할 수 있는 만큼의 큰 그물코를 사용하는 방법, 정착성 어류의 서식지가 아닌 조업구역을 설정하는 방법 등이 있다.

• 수산해양기술연구
• /
• 제53권1호
• /
• pp.77-88
• /
• 2017

The concern on the greenhouse gas emissions is increasing globally. Especially, the greenhouse gas emission from fisheries is an important issue due to Cancun Agreements Mexico in 1992 and the Kyoto protocol in 2005. Furthermore, the Korean government has a plan to reduce the GHG emissions as 5.2% compared to the BAU in fisheries until 2020. However, the investigation on the GHG emissions from Korean fisheries has not been executed much. Therefore, the quantitative analysis of GHG emissions from Korean fishery industry is needed as the first step to find a relevant way to reduce GHG emissions from fisheries. The purpose of this research is to investigate which degree of GHG emitted from the major coastal fisheries such as coastal gillnet fishery, coastal dual purpose fishery, coastal pots fishery and coastal small scale stow net fishery. Here, we calculated the GHG emission from the fisheries using the LCA (Life Cycle Assessment) method. The system boundary and input parameters for each process level are defined for LCA analysis. The fuel use coefficients of the fisheries are also calculated according to the fuel type. The GHG emissions from sea activities by the fisheries will be dealt with. Furthermore, the GHG emissions for the unit weight of fishes are also calculated with consideration to the different consuming areas. The results will be helpful to understand the circumstances of GHG emissions from Korean fisheries.

• 해양환경안전학회지
• /
• 제25권5호
• /
• pp.535-541
• /
• 2019

본 연구는 해상풍력발전단지 내 어업의 가능성을 살펴보고자, 어구 및 어법이 해상풍력발전단지 내 터빈과 해저케이블에 미치는 위험도를 평가하였다. 서남해 해상풍력발전단지를 연구 대상 해역으로 설정하여, 주변 국가어항의 선박 현황을 조사하였다. 어선의 현황을 참조하여 22개의 어구 및 어법에 대하여 위험도 평가 기준을 설정하고, 전문가를 통해 위험도를 평가하였다. 위험도가 낮아 해상풍력발전단지 내에서도 조업이 가능하다고 판단되는 어구 및 어법은 외줄낚시, 대낚시, 멸치챗배였으며, 위험도가 보통으로서 조업이 가능하기는 하나, 주의가 필요하다고 생각되는 어구 및 어법은 바닥주낙, 뜬주낙, 끌낚시, 오징어채낚기, 문어단지, 주꾸미소호, 연안통발, 주목망, 낭장망, 고정자망, 유자망이었다. 위험도가 높아 해상풍력발전단지 내 조업이 어렵다고 판단되는 어구 및 어법은 형망, 빔트롤, 건착망류였으며, 위험도가 아주 높아 해상풍력발전단지 내 어업이 허용되기 어렵다고 판단되는 어구 및 어법은 안강망, 기선권현망, 오터트롤, 외끌이기선저인망, 쌍끌이기선저인망이었다.

• 한국수산과학회지
• /
• 제31권5호
• /
• pp.727-738
• /
• 1998

1995년 4월부터 1996년 1월 사이에 서해 영광 연안에서 주목망으로 채집한 부영생물의 종조성과 계절에 따른 양적 변동을 파악하였다. 한 시기 정점간의 종조성 변화가 적어 조석간만의 차가 심한 서해에서는 강한 조류를 이용한 수동어구의 자료는 우점종에 대해서 정량화가가능하였다. 조사기간중 총 98종이 출현하였으며, 그중 어류가 $52.0\%$, 새우류 $44.6\%$, 두족류 $2.0\%$, 게류 $1.4\%$ 및 복족류가 $.1\%$ 미만을 차지하였고, 청멸 (Thryssa kammalensis), 마루자주새우 (Crangon hakodatei), 중하 (Metapenaeus joynezi), 민태 (Johnius grypotus) 등이 전체의 $68\%$ 이상을 차지하여 소수종에 의해서 우점하였다. 출현종수와 개체수 및 생체량의 계절변동이 크게 나타났다. 주성분 분석 결과, 부영생물의 종조성이 정점간의 변화보다는 계절적인 변동이 크게 나타났다. 서해 남부의 영광 연안 해역은 세립질 퇴적물이 우세한 해역으로 서해 중부 해역과는 다른 종조성을 보였다.