오징어채낚기용 은백색 유인체 개발과 어획성능
Development of the silver-white decoy for squid automatic jigging machine and fishing performance
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초록
오징어의 먹이, 색맹 및 망막운동반응 등을 고려한 진주안료, 고투명성 PP 및 혼합제 등을 이용하여 자동조획기용 오징어낚시의 몸체에 해당하는 유인체를 소형과 기존 크기로 개발하였다. 개발한 은백색 유인체에 대하여 광학적 특성을 조사한 결과, 휘도는 광의 밝기가 증가함에 따라 증가 하였는데 기존색채인 녹색, 암녹색보다 은백색이 뚜렷하였으며, 콘트라스트도 은백색이 10.33으로 가장 큰 것으로 나타났다. 이와 같은 특성을 갖는 소형 은백색 유인체로 만든 오징어낚시의 어획성능을 2012년 7월에 오징어채낚기 어선 4척을 이용해서 메탈핼라이드 집어등 조건 하에서 조사하였다. 어획성능은 비교적 소형오징어를 어획한 행복호가 큰 오징어를 어획한 어선보다 우수하였고 또한 은백색낚시를 모든 자동조획기에 장착한 어선이 그렇지 않는 어선보다 우수하였음을 알 수 있었다. 따라서 소형 은백색낚시의 어획성능을 높이기 위해서는 조업어선의 모든 자동조획기에 장착하고 소형 오징어가 어획 되는 7월 이전에 조업하는 것이 효과적일 것으로 판단된다.
Abstract
Decoys for automatic jigging machines, the body part of a squid hook, have been developed in small and existing sizes in consideration of squid food, color blindness, and retinomotor responses and in utilization of pearl pigment, PP of high transparency, and combined mixture. In comparison of the developed silver-white decoy and existing decoys, the optical characteristics were examined, and the fishing performance of small size silver-white squid hooks was assessed in application of 4 fishing boats with the squid automatic jigging machine and metal halide fishing lamp in July, 2012. The luminances of the three squid hook colors – green, dark green and silver-white – increased as the intensity of illumination increased. Among these, the increase of silver-white was particularly distinguished. As to the average contrast of squid hooks, that of silver-white was 10.33, which was the highest, and then green 1.86 and dark green -0.10 in the order. As to the fishing performance of the silver-white hook, that of the 202Geumyeong-ho and 101Yongjin-ho which caught squids were similar to that of the existing green hook and was relatively low in the case of the Dongbu-ho. However, that of the Haengbok-ho which caught relatively small squids whose average length was 19.9cm and installed silver-white hook in all automatic jigging machines was significantly excellent. In order to enhance the fishing performance of small size silver-white hooks, therefore, it would be effective to install in every automatic jigging machines of fishing boat and to start fishing before July by which small squids are caught.
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