Journal of the Korean Society of Fisheries and Ocean Technology (수산해양기술연구)

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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Study on the Improvement of Gill Nets and Trap Nets Fishing for the Resource Management at the Coastal Area of Yellow Sea - Mesh Selectivity of Gill Nets for Croacker, Miichthys miiuy -

서해구 자원관리형 자망 · 통발 어구어법 기술개발에 관한 연구 - 민어 Michthys miiuy 자망의 망목선택성 -

  • Published : 2004.08.01
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Abstract

In order to examine the mesh selectivity and optimum mesh size of gill nets for croaker, Milichthys miiuy, the field experiments were carried out during Aug. 10 to 14, 2002 and Aug. 10 to 17, 2003 at the caostal area of Imja-Do, Shinan, Jeonnam province. The experimental fishing gears were used in two set of gill nets, which one set was consisted of 12 sheets of gill nets, and each set was connected alternatively 4 different sheets that were 129mm, 135mm, 144mm and 150mm in mesh size. The analysis of mesh selectivity curve was done by Kitahara's method. The results obtained are summerized as follows : 1. The total number of catch by the experimental fishing of gill nets for croaker was 719, and it was consisted of 526 croakers (73.1%), 168 blue crabs (23.4%), 17 harvest fishes (2.4%) and 8 other fishes (1.1%). 2. The value of maximum 1/m on the mesh selectivity curve was estimated at 6.91. 3. The value of 1/m on the 50% selection range was estimated at 5.62${\sim}$80.3, and the selection width was 2.41. 4. The optimum mesh size of gill nets for croaker was estimated 142mm, and the 50% selection range of total length of croaker was 798${\sim}$1,140mm.

민어 자망의 망목선택성 및 적정 망목을 추정하기 위하여 전남 신안구 임자도 인근의 해역에서 2002년 8월 10${\sim}$8월 14일 및 2003년 8월 10일${\sim}$8월 17일까지 시험조업을 실시하였다. 시험어구는 망목 129mm, 135mm, 144mm 및 150mm의 4종류의 자망을 각각 1폭씩 교호로 연결해서 12폭을 1조로 구성하여 2개조를 사용하였으며, 망목선택성 곡선의 분석에는 Kitahara(1968)의 방법을 이용하였다. 그 결과를 요약하면 다음과 같다. 1. 민어 자망의 시험조업 결과 총어획미수는 719마리였으며, 민어 526마리 (73.1%), 꽃게 168마리 (23.4%), 병어 17마리 (2.4%) 기타 8마리 (1.1%) 등이었다. 2. 망목선택성 곡선의 추정에서 최대 전장/망목(max. 1/m)의 값은 6.91으로 추정되었다. 3. 50% 선택구간에 대한 전장/망목(1/m)의 값은 5.62${\sim}$8.03으로 추정되었으며, 그 선택폭은 2.41이었다. 4. 민어 자망의 적정 망목은 약 142mm로 추정되었으며, 민어의 50% 선택체장 범위는 798${\sim}$1,140mm로 나타났다

Keywords

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