Fishing Efficiency in Different Lengths and Weights of Hagfish Pots, and Different Kinds of Baits

• Main Authors: Hsiao-Chih Wu, 吳効直
• Other Authors: Chuan-Hung HO
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/17274626981778670222

碩士 === 國立臺灣海洋大學 === 環境生物與漁業科學學系 === 93 === Abstract The history of hagfishery in the Tungkang area in Taiwan has been more than a decade, which marks a distinguishing local business. Research conducted on the hagfish has been done regarding the biological aspects, including reproduction and physiology etc., but not on the viewpoints of fishing tools and fishing methods. The hagfishery is being developed, in areas along the Pacific coast such as Japan, Korea, America, and Canada for more than forty years. Among all the countries above, Tsushima Island fishermen in Japan employ the longest hagfish pots among those of other countries; the kinds of bait used differ significantly as well. This study is for proper length and weight of hagfish pots, and compare the fishing efficiency with different kinds of baits, then expect to improve the fishing efficiency of hagfish pots. The research in the thesis has conducted a series of experiments in September, 2003 and October, 2004, outside of South China Sea and LiuChiu Yu. In the experiment of how hagfish pot length affects fishing efficiency, the results indicate that the optimum length of hagfish pots is 67cm used by Taiwanese fishermen, and the 80cm-pots used by Tsushima Island Japanese fishermen is valid for being second effective; and the pots over 80cm have been observed to drop apparently in fishing efficiency. As for the 67cm hagfish pots, if attaching lead onto the pots, better fishing results are found to be achieved; however the growth of fishing results only progresses in a limited way. If taking the lead of line hauler into account, the contribution of lead can be in achieved only when a larger line hauler is set up. Four baits were used in baits studies and the results show that Skipjack was the best bait compared with Mackerel,Ribbonfish and Tilapia.