• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.10a
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• pp.294-295
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• 2000

근해 안강망 어업은 강한 조류를 이용하는 어법으로서 조차가 큰 황해∼동중국해에서 주로 조업이 이루어진다. 특히, 갈치, 조기류, 병어류, 아귀류, 새우류, 두족류 등의 중ㆍ저층에 서식하는 유영생물을 대상으로, 이들 어종을 찾아 이동하며 조업을 하는 특성을 가지고 있다. 근해 안강망 어업은 90톤급 어선이 인천, 군산, 목포, 여수 등지에서 총 650여 척이 허가되어 있는데 이중 80％ 정도가 실제 조업을 하고 있다. 이중 군산에 근거를 두고 있는 근해 안강망어업은 90척 내외로 황해∼동중국해를 어장으로 이용하고 있다.(안강망 수협, 미발표자료). (중략)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2003.05a
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• pp.39-39
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• 2003

우리나라는 얼마 전까지만 해도 어업허가제도에 의하여 어업자원을 관리하여 왔다. 그러나 어업기술의 발달로 상대적으로 과거에 비해 어획노력의 증대와 더불어 대부분의 수산자원이 남획상태에 이르게 되었다. 허가제도하에서는 과잉노력량에 대한 조정이 곤란하고 현실적으로 불법ㆍ남획어업이 자행되어 어업자원 고갈현상이 가속화되고 해양오염 증가와 매립ㆍ간척으로 인한 어장축소 등으로 어업생산성 저하됨으로서 새로운 어업관리제도의 필요성 대두되어 간접적 자원관리방식의 전통적 방법에서 어획량을 직접 관리하는 TAC제도로의 전환 필요성 증대되었다. (중략)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.05a
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• pp.35-36
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• 2000

해저지형에 관한 정보는 어류의 이동 경로나 정치성 어장 위치의 적절성 등을 판단하는데 중요하게 사용될 뿐만 아니라 선박의 항로, 해양구조물의 건설과도 관련이 있는 귀중한 정보이다. 이 정보는 음향 측심기, DGPS 수신기, 퍼스널 컴퓨터 및 측량용 소프트웨어로 구성되는 시스템을 사용하여 얻었다. 여기서는 현장에서 측정한 해저지형 관련 데이터의 처리에 관해 언급하였다. (중략)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.05a
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• pp.344-345
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• 2000

근해안강망어업에서 주로 어획되는 수산자원은 참조기, 갈치, 아귀등의 저서성어류로서, 겨울에는 월동장인 우리나라 서해남부 및 동중국해 북부해역으로 남하회유하고 봄이 되면 황해 및 중국 연안의 산란장으로 북상이동하는 계절회유를 한다. 따라서 근해안강망어업의 주간어황은 황해 및 동중국해에 서식하는 대상어업자원의 자원량변동의 영향을 받으며, 해황의 변동에 따른 회유경로의 경년변동 및 계절회유에 의한 주 서식처의 변동, 조석의 변동, 어장의 일기등의 영향을 받는다. (중략)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.05a
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• pp.83-84
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• 2001

최근 어장환경의 변화와 과다한 어획으로 연근해의 수산자원은 주요 어획종의 어획량이 감소하고 있는 추세를 보이고 있다. 이로 인하여 연근해 수산생물자원의 주요 먹이생물 이었던 새우류의 자원이 증가하고 있다. 이와 같은 새우류 자원증가는 남해안 어민들로 부터 이동성 구획어업인 새우조망어업 허가 신청이 급증하고 있으나, 아직 새우조망어업에 대한 연구는 전무한 실정으로 본 어업에 대한 전반적인 연구가 요구된다. (중략)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.05a
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• pp.71-72
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• 2001

접근하는 어군을 기다려서 어획하는 연안의 정치망과 같은 고정식 어구는 지리적인 여건과 지형적인 특성이 해황의 변동과 더불어 어획량에 직접적인 영향을 미치게 된다. 그러나 어군을 쫓아서 조업하는 어구의 경우는 어구ㆍ어법의 개량 등을 통하여 극복할 수 있고, 해황의 변동으로 인한 어획량의 감소가 있을 경우에도 어군을 찾아서 어장을 이동할 수 있는 등의 장점이 있다. (중략)

• Journal of Fisheries and Marine Sciences Education
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• v.10 no.1
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• pp.31-52
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• 1998

In this paper, we analyzed the relationships between the fishing ground formation and the sea condition information, surface, mid and bottom layer temperature that is necessary for fishing point selection of angling to catch squid in the East Sea. There was a little differences between temperature measured by every fishing boat on fishing operating and prompt reports of fishing and sea condition about fishing ground formation of angling. And then the result examined by using SST that is a important information of sea condition for the fishing position selection follows as ; We knew, even if the differencs of sea condition each year, SST with a lot of fishing boats was generally within the extnet of $2^{\circ}C$. But the result examined by the limit time about the temperature of mid and bottom layer for the groups of fishing boats not to measure and for the near sea measurement to be done only within EEZ waters follows as ; About the temperature of 50m layer on early in June and July in operating waters of the group of fishing boats, the fishing ground was formed from $10^{\circ}C$ to $12^{\circ}C$ between warm waters and cold waters, afterwards we can seize that the fishing ground was moving to waters from $5^{\circ}C$ to $8^{\circ}C$ at near of polar front. In the coastal waters, we knew that fishing ground is formed to waters from $10^{\circ}C$ to $12^{\circ}C$ at the southern of polar front about the temperature of 50m layer.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.17 no.2
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• pp.92-100
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• 1984

The seasonal variation of catch and the fishing ground formation of anchovy caught by gill net are studied by using the data for 14 years, 1969 to 1982, published by the Fisheries Research and Development Agency of Korea. The main fishing season of anchovy by gill net can be devised into two seasons: spring and autumn. The former begins early in spring, marks peak in May with the monthly mean catch of 3,000 $\frac{M}{T}$ and ends in summer. The latter begins early in autumn, marks peak in October with the monthly mean catch of 1,500$\frac{M}{T}$ and ends in winter. The fishing ground begins to be formed in the southern waters of Korea with the begining of spring fishing season, and it is extended all over the south-eastern waters from spring to summer and it is converged to the coastal areas from autumn to winter. From the calculation of correlationship between adjacent fishing sections, the fishing ground can be devided into three areas; the northern area of $37^{\circ}N$, the southern area of $35^{\circ}N$ and the area between $35^{\circ}N\;and\;37^{\circ}N$. In the northern area of $37^{\circ}N$, monthly centers of the fishing ground are located in the adjacent aea area of Sockcho-Jumunjin district in the whole year, and its annual mean variance shows about 8 miles in the latitudinal direction and 10 miles in the longitudinal direction. In the area between $35^{\circ}N\;and\;37^{\circ}N$, monthly centers are located in the adjacent sea area of Kijang-Kuryongpo district, and the variance shows about 10 miles in the longitudinal direction and 20 miles in the latitudinal direction. In the southern area of $35^{\circ}N$, monthly centers are located in the open sea in spring and summer, and are conversed to the coastal area in autumn and winter, and the variance shows 8 miles in the latitudinal direction and 35 miles in the longitudinal direction. Water temperature and salinity at the fishing ground where the anchovy gill net was effectively operated are estimated from 14 to $20^{\circ}C$ and from 33.0 to $34.0\%0$ respectively.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.31 no.1
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• pp.8-14
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• 1995

The behaviour of large school of sardine Sardinops melanosticta in and around the set-net were analyzed from sonar image recordings. The survey was conducted at Kishihata set-net in Japan from January 29th to February 22th 1992. The results obtained are summarized as follows ; 1. When large schools of sardine moved along the outside of the set-net. the shape of the school gradually changed, that was the front part extended forward in the direction of movement and the rear part concentrated in the same direction such that the school retained its original shape. 2. When large school of sardine entered the main-net of the set-net. the school was decentralized directly to the slope-net. to the central part. and to the opposite side, and then the fish school was concentrated as it moved directly to the slope-net. 3. When the size of the front part of the fish school enlarged. the maximum recorded moving speeds were 176cm/sec and 277cm/sec for schools inside and outside the set-net, respectively.

• Journal of Aquaculture
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• v.3 no.1
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• pp.89-125
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• 1990

In order to improve top shell seed production techniques spawning and larvae rearing were done in rearing tanks. Growth of young top shell in the nursing ground were also investigated. For induced spawning, top shells were maintained in still water during night time. Then they were treated with ultra violet iradiated sea water after dried up in air for 60 minutes. Spawning rate were 10 to $39.77\%$. It was found that young top shells moved in the growing grounds from nursing grounds when they reached approximately 30-40mm in shell heignt. Among main food algae for top shell in the natural growing grounds, sea mustard were melted away during June. Therefore, presence of another food algae such as Ecklonia cava or Sargassum spp. seems to be the main limiting factor for survival of top shell during summer. The tolerance of top shells ranging from 30mm to 60mm to low density of seawater for were tested at the temperature between 29.5 and $31.4^{\circ}C$. Hundred percent mortality occoured in 20, 55 and 90 hours after first stocking at the specific gravity of 1.010, 1.015, and 1.020, respectively.