• Korean Journal of Fisheries and Aquatic Sciences
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• v.5 no.1
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• pp.11-16
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• 1972

During the period from 1966 to 1968, total catches of Spanish mackerel averaged 6,000 to 7,000M/T per annual in Korea, and approximately 70 per cent of this amount was captured by drift nets. In an effort to improve the efficiency of drift nets, some experiments were conducted in 1969 to investigate the selectivity of material and mesh sizes. Seven different mesh sizes (80,85,95,100,105,110 and 115 mm) of both multi- and mono-filament netting were used, and the following results were obtained : 1, The body weight of Spanish mackerel taken with the seven different mesh sizes ranges from 0.5kg to 2.9kg, and the mode of body weight consists of three groups, 1kg ($21%$), 1.3kg($15\%$) and 1.5kg($19\%$). 2. For multi-filament net, 80 to 105mm mesh sizes were suitable to catch those three groups, and a little smalter than these for mono-filament net. 3. For Spanish mackerel only, the mono-filament material proved to have 1.5 times better selectivity than multi-filament : however, the latter proved superior for miscellaneous fish species due to its different size and shape. 4. Multi-filament net showed better selectivity for smaller species than mono-filament. (and mono-filament in general indicated opposite phenomenon.)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2005.05a
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• pp.102-105
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• 2005

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2005.05a
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• pp.89-90
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• 2005

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2005.05a
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• pp.83-85
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• 2005

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2010.05a
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• pp.155-158
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• 2010

• Proceedings of the Korean Aquaculture Society Conference
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• 2004.05a
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• pp.69-71
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• 2004

• Proceedings of the Korean Aquaculture Society Conference
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• 2004.05a
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• pp.72-74
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• 2004

• Korean Journal of Fisheries and Aquatic Sciences
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• v.18 no.6
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• pp.506-510
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• 1985

It is an important work to determine the mesh size of gill net for efficient catch. For investigating the suitable mesh size, the gill net for anchovy, Engraulis japonica was made and operated in the bay of Ulsan in July. 1983. The gill net for anchovy was composed of six different mesh size, 23.1mm (H=0.65), 21.6mm (H=0.65), 20.0mm (H=0.65), 23.1mm (H=0.55), 21.6mm (H=0.55) and 20.0mm(H=0.55). The parts of body caught by the gill net was examined, and the selectivity curves (for reference Ishida's method) with respect to the each mesh size were estimated using the data obtained through the operation of research gill net. The main results of this study are as follows: 1. The number of anchovy whose neck was in net was 148, more than $90\%$ of all, 161 2. The coefficient of relationship between the circumference of neck and the fork length were 0.70. 3. Fork length that the relative fishing efficiency of 23.1 mm mesh size (H=0.55) was maximum value was about 11.1 centimeter.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.10a
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• pp.81-82
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• 2001

삼중자망 어업은 어떤 형태나 크기의 생물이 내유 하든지 어획이 가능하며, 또한 치자어 남획에 대한문제가 제기되어 우리나라에서는 자원 보호적인 측면에서 일부해역, 특정 어종을 제외하고 법적으로 허가가 금지된 어업이다. 그러나 특별한 어로설비를 필요로 하지 않으며, 어업기술 수준이 낮아도 조업이 가능하다는 점과 어획성능이 타 업종에 비해 높다는 이유로 연아어업자의 30％이상이 불법어구임을 알면서도 조업을 하고 있으며, 그 수는 계속적으로 증가되고 있는 추세이다. (중략)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2003.10a
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• pp.19-22
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• 2003

통발어업은 어구 조작을 위한 선박 의존도가 적고, 어구를 예인하지 않아 배의 속력이나 기관 마력을 그다지 크게 할 필요성이 없으므로 유류 사용량이 적으며, 저인망이나 연승 등으로 조업이 곤란한 기복이 심한 해저나 심해에서도 조업이 가능하다는 장점이 있다. 본 연구실에서는 통발 어구에 대해 미성어를 탈출하게 하여 보호하고, 성숙한 개체만을 선택적으로 어획할 수 있는 자원관리형 통발 어구어법 개발에 관한 연구가 수행 중에 있으며, 현장실험을 통해 어구에 대한 어획선택성, 자원상태와 어획강도 등에 관한 연구를 수행하고 있다. (중략)