본 연구는 저서 어족자원이 풍부하게 존재하고 있어서 각종의 저층 어업이 성행하고 있는 전라남도 고흥군 남부 해역에 대해 2002년 11월 초부터 2003년 10월말까지에 걸쳐 어장 환경 조사와 소형 기선저인망에 대한 어획 실적 조사 및 실제 조업선을 이용한 어획실험을 행함으로써, 고흥군 남부 해역에 서식하는 저서 자원의 어획 실태를 파악하는데 주력하였으며, 조사 및 실험을 통해 얻어진 결과는 대략 다음과 같다. 1) 조사 해역의 연중 저층 수온 범위는 8.5~25.0℃로서 1월에 8.5℃로 가장 낮았고 8월에 25.0℃로 가장 높아 약 16℃ 차이를 보였으며, 연중 저층 염분범위는 31.09~33.37‰로서 1~5월에는 큰 변화 없이 33.18~33.37％범위였고 8월에는 31.09‰로 가장 낮았으며, 저질은 대부분이 뻘이었다. 2) 35척의 소형 기선저인망 어선이 올린 어획 실적을 수집하여 분석한 결과, 어선 1척당 1일 어획량은 여름철인 6~7월에 약 70kg으로 가장 높고 겨울철인 1~2월에 약 45kg으로 가장 낮았으며, 낙지 어획량은 약 17~30kg 범위로서 전체 어획량의 약 30％ 정도를 차지하였다. 또한, 예망 시간당의 척당 낙지 어획량은 3~6kg 범위로서, 3월과 6월에 대체적으로 높고 1~2월과 4~5월 및 9월에 낮은 경향을 보였다. 3) 소형 기선저인망 어구를 직접 사용하여 어획 실험을 한 결과, 어획된 수족은 어류가 45종, ...
본 연구는 저서 어족자원이 풍부하게 존재하고 있어서 각종의 저층 어업이 성행하고 있는 전라남도 고흥군 남부 해역에 대해 2002년 11월 초부터 2003년 10월말까지에 걸쳐 어장 환경 조사와 소형 기선저인망에 대한 어획 실적 조사 및 실제 조업선을 이용한 어획실험을 행함으로써, 고흥군 남부 해역에 서식하는 저서 자원의 어획 실태를 파악하는데 주력하였으며, 조사 및 실험을 통해 얻어진 결과는 대략 다음과 같다. 1) 조사 해역의 연중 저층 수온 범위는 8.5~25.0℃로서 1월에 8.5℃로 가장 낮았고 8월에 25.0℃로 가장 높아 약 16℃ 차이를 보였으며, 연중 저층 염분범위는 31.09~33.37‰로서 1~5월에는 큰 변화 없이 33.18~33.37％범위였고 8월에는 31.09‰로 가장 낮았으며, 저질은 대부분이 뻘이었다. 2) 35척의 소형 기선저인망 어선이 올린 어획 실적을 수집하여 분석한 결과, 어선 1척당 1일 어획량은 여름철인 6~7월에 약 70kg으로 가장 높고 겨울철인 1~2월에 약 45kg으로 가장 낮았으며, 낙지 어획량은 약 17~30kg 범위로서 전체 어획량의 약 30％ 정도를 차지하였다. 또한, 예망 시간당의 척당 낙지 어획량은 3~6kg 범위로서, 3월과 6월에 대체적으로 높고 1~2월과 4~5월 및 9월에 낮은 경향을 보였다. 3) 소형 기선저인망 어구를 직접 사용하여 어획 실험을 한 결과, 어획된 수족은 어류가 45종, 두족류가 5종, 새우류가 13종, 게류가 8종, 기타가 4종 등으로서 총 75종의 수족이 출현하였으며, 분류군별 개체수는 새우류가 181,735개체(58.2％)로 대부분을 차지하였고 어류는 56,189개체(17.8％), 두족류는 7,124 개체(2.3％)이었으며, 중량으로 본 경우는 어류가 496,108g(35.3％)로 가장 높았고 새우류가 286,593g(21.7％), 게류가 88,546g(6.1％), 두족류가 75,366g(5.7％)이었다. 4) 종별 어획 개체수는 민새우가 91,078개체로 가장 많았고(29.2％), 갯가재가 45,670개체(14.6％), 마루자주새우가 45,560개체(14.6％), 그라비새우가 33,656개체(10.8％), 낙지가 623개체(0.2％)이었으며, 종별 어획 중량은 갯가재가 352,676g(26.7％)으로 가장 높았고, 청멸이 113,937g(8.6％), 민새우가 101,214g(7.7％), 민태가 79,870g(6.0％), 낙지가 51,988g(3.9％)이었다. 5) 소형 기선저인망으로 조사한 월별 출현 개체수는 2월에 85,200개체로 가장 많았고 다음이 5월과 4월 및 6월의 순이었으며 10월에 8,051개체로 가장 적었다. 또한, 월별 예망당 어획량은 겨울철인 12~1월에 약 20kg으로 가장 낮았고 여름철인 7월에 약 160kg으로 가장 높았다. 6) 전체 어종에서 어획량이 가장 많은 갯가재는 연간 출현하되 그 어획량은 1월과 9월에 낮고, 11월과 3월~8월에 높게 나타났으며, 청멸의 어획량은 7월에 가장 높고 10월에 비교적 높게 나타났다. 또한, 민새우와 민태는 9월~익년 5월에 걸쳐 어획되는 반면 6월~8월의 여름철에는 거의 어획되지 않았으며, 낙지는 계절에 관계없이 연중 어획되고 3월~6월 사이에 어획량이 특히 높았다. 7) 어획 실험 조사기간 동안 출현한 주요 어종의 체장을 보면, 전갱이는 4~15cm(평균 8.9cm), 개서대는 4~22cm(평균 10.8cm), 갯장어는 7~23cm(평균 15.3cm), 갈치는 10.1~15.5cm, 참조기는 11.9~17.0cm로서, 대부분 미성숙 개체들이 출현하였다. 8) 소형 기선저인망 어구로 조사한 단위 소해 면적당 어획량(어획 밀도)은 전체 평균 2.90g/㎡으로서, 봄철인 4~5월에 4.28~5.24g/㎡로 가장 높았고 겨울철인 12~1월은 1.75~1.42g/㎡로 가장 낮았다. 또한, 분류군별 평균 어획 밀도는 어류가 1.09g/㎡, 새우류가 0.63g/㎡, 두족류가 0.17g/㎡, 기타 어종이 0.82g/㎡로서 어류와 새우류의 어획 밀도가 특히 높았다.
본 연구는 저서 어족자원이 풍부하게 존재하고 있어서 각종의 저층 어업이 성행하고 있는 전라남도 고흥군 남부 해역에 대해 2002년 11월 초부터 2003년 10월말까지에 걸쳐 어장 환경 조사와 소형 기선저인망에 대한 어획 실적 조사 및 실제 조업선을 이용한 어획실험을 행함으로써, 고흥군 남부 해역에 서식하는 저서 자원의 어획 실태를 파악하는데 주력하였으며, 조사 및 실험을 통해 얻어진 결과는 대략 다음과 같다. 1) 조사 해역의 연중 저층 수온 범위는 8.5~25.0℃로서 1월에 8.5℃로 가장 낮았고 8월에 25.0℃로 가장 높아 약 16℃ 차이를 보였으며, 연중 저층 염분범위는 31.09~33.37‰로서 1~5월에는 큰 변화 없이 33.18~33.37％범위였고 8월에는 31.09‰로 가장 낮았으며, 저질은 대부분이 뻘이었다. 2) 35척의 소형 기선저인망 어선이 올린 어획 실적을 수집하여 분석한 결과, 어선 1척당 1일 어획량은 여름철인 6~7월에 약 70kg으로 가장 높고 겨울철인 1~2월에 약 45kg으로 가장 낮았으며, 낙지 어획량은 약 17~30kg 범위로서 전체 어획량의 약 30％ 정도를 차지하였다. 또한, 예망 시간당의 척당 낙지 어획량은 3~6kg 범위로서, 3월과 6월에 대체적으로 높고 1~2월과 4~5월 및 9월에 낮은 경향을 보였다. 3) 소형 기선저인망 어구를 직접 사용하여 어획 실험을 한 결과, 어획된 수족은 어류가 45종, 두족류가 5종, 새우류가 13종, 게류가 8종, 기타가 4종 등으로서 총 75종의 수족이 출현하였으며, 분류군별 개체수는 새우류가 181,735개체(58.2％)로 대부분을 차지하였고 어류는 56,189개체(17.8％), 두족류는 7,124 개체(2.3％)이었으며, 중량으로 본 경우는 어류가 496,108g(35.3％)로 가장 높았고 새우류가 286,593g(21.7％), 게류가 88,546g(6.1％), 두족류가 75,366g(5.7％)이었다. 4) 종별 어획 개체수는 민새우가 91,078개체로 가장 많았고(29.2％), 갯가재가 45,670개체(14.6％), 마루자주새우가 45,560개체(14.6％), 그라비새우가 33,656개체(10.8％), 낙지가 623개체(0.2％)이었으며, 종별 어획 중량은 갯가재가 352,676g(26.7％)으로 가장 높았고, 청멸이 113,937g(8.6％), 민새우가 101,214g(7.7％), 민태가 79,870g(6.0％), 낙지가 51,988g(3.9％)이었다. 5) 소형 기선저인망으로 조사한 월별 출현 개체수는 2월에 85,200개체로 가장 많았고 다음이 5월과 4월 및 6월의 순이었으며 10월에 8,051개체로 가장 적었다. 또한, 월별 예망당 어획량은 겨울철인 12~1월에 약 20kg으로 가장 낮았고 여름철인 7월에 약 160kg으로 가장 높았다. 6) 전체 어종에서 어획량이 가장 많은 갯가재는 연간 출현하되 그 어획량은 1월과 9월에 낮고, 11월과 3월~8월에 높게 나타났으며, 청멸의 어획량은 7월에 가장 높고 10월에 비교적 높게 나타났다. 또한, 민새우와 민태는 9월~익년 5월에 걸쳐 어획되는 반면 6월~8월의 여름철에는 거의 어획되지 않았으며, 낙지는 계절에 관계없이 연중 어획되고 3월~6월 사이에 어획량이 특히 높았다. 7) 어획 실험 조사기간 동안 출현한 주요 어종의 체장을 보면, 전갱이는 4~15cm(평균 8.9cm), 개서대는 4~22cm(평균 10.8cm), 갯장어는 7~23cm(평균 15.3cm), 갈치는 10.1~15.5cm, 참조기는 11.9~17.0cm로서, 대부분 미성숙 개체들이 출현하였다. 8) 소형 기선저인망 어구로 조사한 단위 소해 면적당 어획량(어획 밀도)은 전체 평균 2.90g/㎡으로서, 봄철인 4~5월에 4.28~5.24g/㎡로 가장 높았고 겨울철인 12~1월은 1.75~1.42g/㎡로 가장 낮았다. 또한, 분류군별 평균 어획 밀도는 어류가 1.09g/㎡, 새우류가 0.63g/㎡, 두족류가 0.17g/㎡, 기타 어종이 0.82g/㎡로서 어류와 새우류의 어획 밀도가 특히 높았다.
This study is regarding the abundance of demesal fish resources, which exist, allowing all kinds of fisheries to prosper in the southern sea area, off the coast of Goheung in Jeonnam Province. From the first of November, 2002 until the end of October 2003, an investigation regarding the conditions o...
This study is regarding the abundance of demesal fish resources, which exist, allowing all kinds of fisheries to prosper in the southern sea area, off the coast of Goheung in Jeonnam Province. From the first of November, 2002 until the end of October 2003, an investigation regarding the conditions of these fishing grounds was carried out. A small trawler was used to determine how much fish could be caught, and as well, a regular operations fishing vessel was used to see how great the fish catch would be. In the sea off the southern coast of Goheung great endeavors were made in order to understand the actual fish catch conditions in the demesal fish resources. The results acquired in this investigation and fishing operation are summarized as follows: 1) In the investigation of this area of the sea, the temperature of the bottom layer throughout the year, had limits from 8.5~25.0℃. The temperature in January was the lowest, at 8.5℃, and in August was the highest, at 25℃, thus having a greatest difference of 16℃. Throughout the year, the salinity levels for the bottom layer had limits from 31.09~33.7％. There was hardly any difference in salinity from January to May, when the limits were from 33.18~33.37％, and the overall lowest salinity was in August, when the salinity was 31.09％. And most of the seabed was found to be mud. 2) The results showing the fish catches of 35 small trawlers were collected and analysed, the quantity of fish caught by one fishing vessel per day in the summer season, from June to July, was the highest, at about 70kg, and the respective caught in the winter, from January to February, was the lowest at about 45kg. The limits for quantity of common octopus caught were about 17~30kg, which accounted for about 30％ of the total overall catch. Also, the limits for quantity of common octopus caught by each vessel per dragging hour were 3~6kg, the most octopus, were generally caught in March and June, and the least octopus tended to be caught from January to February, from April to May, and in September. 3) In the investigation, where small scale trawlers were used, there were some immediate results, it was found that 75 different species of aquatic creatures were caught and of these, 45 were fish, 5 were Cephalopods, 13 were shrimp, 8 were crab, and other species made up the other 4. The number of individual by species, included 181,735 shrimp(58.2％), which made up the highest percentage, followed by 56,189 fish(17.8％), then 7,124 Cephalopods(2.3％). In the case of weight, fish weighed the most, at 496,108g(35.3％), followed by shrimp at 286,593g(21.7％), then crab at 88,546g(6.1％) and at the lowest, Cephalopod at 75,366g(5.7％). 4) Considering the number of individual caught per species, Parapenaeopsis tenella was caught the most, at 91,078 individuals (29.2％), followed by Squilla oratoria at 45,670(14.6％), then Crangon hakodatei at 45,560(14.6％, and then Palaemon grauieri at 33,656(10.8％), and Octopus minor at 623(0.2％). And, for the weight of catch by fish species, Squilla oratoria at the highest weight, at that of 352,676g(26.7％), followed by Thrissa kammaiensis at 113,937g(8.6％), then Parapenaeopsis tenella at 101,214g(7.7％), and then Johnius grypotus at 79,870g(6.0％) and Octopus minor at 51,488g(3.9％). 5) The monthly appearance of individual sea creatures was the greatest in February, at 85,200, followed by May, April and then June, in that order. Then, the lowest number of individuals appeared in October. at 8,051. Also, the monthly weight of catch per dragging was viewed, in which case the winter season, from December to January was the lowest, at about 20kg, and the summer season, in July, was the highest, at 160kg. 6) Of the total caught, the largest in number was the Squilla oratoria, It made yearly appearances, in which quantity caught was the lowest in January and September, while the greatest amount was caught in November and from March through August and Thrissa kammaiensis caught was in July, but comparitively October was also quite high. Also, Parapenaeopsis tenella and Johnius grypotus can be caught from September to May in the next year, whereas in the summer, from June to August, almost none can be caught and no season related to catch of the Octopus minor, however between the months of March and June, the catch is highest. 7) Of the fish caught during the fishing examination period of investigation, the body lengths of the dominant fish could be seen, the length of the Trachurus japonicas was 4~15cm(ave. of 8.9cm), the Cynoglossus robustus was 4~22cm(ave. of 10.8cm), the Muraenesox cinereus was 7~23cm(ave. of 15.3cm), the Trihiurus lepturus was 10.1~15.5cm, and the Larimichthys polyactis at a length of 11.9 ~ 17.0cm, and most of these sea creatures did not appear to be mature. 8) The small scale trawl net was used in the investigation, in order to determine the density of the catch for the dragging area, the following results were found for density: The average density was 2.90g/㎡, for the spring, from April to May it was highest, at 4.28~5.24g/㎡, for the winter, from December to January it was lowest, at 1.75~1.42g/㎡. Also, the mean density of the catch by species was 1.09g/㎡ for fish, 0.63g/㎡ for shrimp, 0.17g/㎡ for Cephalopodes, and 0.82g/㎡ for other sea creatures and especially high for fish and shrimp.
This study is regarding the abundance of demesal fish resources, which exist, allowing all kinds of fisheries to prosper in the southern sea area, off the coast of Goheung in Jeonnam Province. From the first of November, 2002 until the end of October 2003, an investigation regarding the conditions of these fishing grounds was carried out. A small trawler was used to determine how much fish could be caught, and as well, a regular operations fishing vessel was used to see how great the fish catch would be. In the sea off the southern coast of Goheung great endeavors were made in order to understand the actual fish catch conditions in the demesal fish resources. The results acquired in this investigation and fishing operation are summarized as follows: 1) In the investigation of this area of the sea, the temperature of the bottom layer throughout the year, had limits from 8.5~25.0℃. The temperature in January was the lowest, at 8.5℃, and in August was the highest, at 25℃, thus having a greatest difference of 16℃. Throughout the year, the salinity levels for the bottom layer had limits from 31.09~33.7％. There was hardly any difference in salinity from January to May, when the limits were from 33.18~33.37％, and the overall lowest salinity was in August, when the salinity was 31.09％. And most of the seabed was found to be mud. 2) The results showing the fish catches of 35 small trawlers were collected and analysed, the quantity of fish caught by one fishing vessel per day in the summer season, from June to July, was the highest, at about 70kg, and the respective caught in the winter, from January to February, was the lowest at about 45kg. The limits for quantity of common octopus caught were about 17~30kg, which accounted for about 30％ of the total overall catch. Also, the limits for quantity of common octopus caught by each vessel per dragging hour were 3~6kg, the most octopus, were generally caught in March and June, and the least octopus tended to be caught from January to February, from April to May, and in September. 3) In the investigation, where small scale trawlers were used, there were some immediate results, it was found that 75 different species of aquatic creatures were caught and of these, 45 were fish, 5 were Cephalopods, 13 were shrimp, 8 were crab, and other species made up the other 4. The number of individual by species, included 181,735 shrimp(58.2％), which made up the highest percentage, followed by 56,189 fish(17.8％), then 7,124 Cephalopods(2.3％). In the case of weight, fish weighed the most, at 496,108g(35.3％), followed by shrimp at 286,593g(21.7％), then crab at 88,546g(6.1％) and at the lowest, Cephalopod at 75,366g(5.7％). 4) Considering the number of individual caught per species, Parapenaeopsis tenella was caught the most, at 91,078 individuals (29.2％), followed by Squilla oratoria at 45,670(14.6％), then Crangon hakodatei at 45,560(14.6％, and then Palaemon grauieri at 33,656(10.8％), and Octopus minor at 623(0.2％). And, for the weight of catch by fish species, Squilla oratoria at the highest weight, at that of 352,676g(26.7％), followed by Thrissa kammaiensis at 113,937g(8.6％), then Parapenaeopsis tenella at 101,214g(7.7％), and then Johnius grypotus at 79,870g(6.0％) and Octopus minor at 51,488g(3.9％). 5) The monthly appearance of individual sea creatures was the greatest in February, at 85,200, followed by May, April and then June, in that order. Then, the lowest number of individuals appeared in October. at 8,051. Also, the monthly weight of catch per dragging was viewed, in which case the winter season, from December to January was the lowest, at about 20kg, and the summer season, in July, was the highest, at 160kg. 6) Of the total caught, the largest in number was the Squilla oratoria, It made yearly appearances, in which quantity caught was the lowest in January and September, while the greatest amount was caught in November and from March through August and Thrissa kammaiensis caught was in July, but comparitively October was also quite high. Also, Parapenaeopsis tenella and Johnius grypotus can be caught from September to May in the next year, whereas in the summer, from June to August, almost none can be caught and no season related to catch of the Octopus minor, however between the months of March and June, the catch is highest. 7) Of the fish caught during the fishing examination period of investigation, the body lengths of the dominant fish could be seen, the length of the Trachurus japonicas was 4~15cm(ave. of 8.9cm), the Cynoglossus robustus was 4~22cm(ave. of 10.8cm), the Muraenesox cinereus was 7~23cm(ave. of 15.3cm), the Trihiurus lepturus was 10.1~15.5cm, and the Larimichthys polyactis at a length of 11.9 ~ 17.0cm, and most of these sea creatures did not appear to be mature. 8) The small scale trawl net was used in the investigation, in order to determine the density of the catch for the dragging area, the following results were found for density: The average density was 2.90g/㎡, for the spring, from April to May it was highest, at 4.28~5.24g/㎡, for the winter, from December to January it was lowest, at 1.75~1.42g/㎡. Also, the mean density of the catch by species was 1.09g/㎡ for fish, 0.63g/㎡ for shrimp, 0.17g/㎡ for Cephalopodes, and 0.82g/㎡ for other sea creatures and especially high for fish and shrimp.
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