중서부태평양 한국 다랑어 선망어구의 구성 변화

Abstract

The tuna purse seine fishery has been developed as the main fishery industry, accounting for 46% of the Korea overseas fisheries since Korea entered the Western and Central Pacific Ocean in 1981. This study conducted research on identifying the process of change in fishing gear and organizing the function of periodically-used fishing gear types through net plan and computer simulation by selecting the design of the four types of fishing gear used for the Korea tuna purse seiner in the Western and Central Pacific Ocean, which 1,000G/T class and whose LOA(length over all) 60m class. Moreover, analyzing annual catch of fish, and checked the effect of the change in fishing gear on the tuna purse seine fishery. In the late 1980s, the length of the tuna purse gear was 1,939m and the design depth was 160m, but currently, the length and the design depth are 2,515m and 230m respectively. As a result of the simulation, the expansion of the fishing gear increased buoyance, sinking force, sinking depth, surrounded volume, and purse wire continuously. Recently, the maximum tension of the currently used purse wire of tuna purse seiner is 23.5tons and is close to 25.4tons which is the maximum lift capacity of purse winch(WS454). Annual catch of fish per fishing vessel were 1,000M/T in the early 1980s but have increased to 8,000M/T since 2006. This result seems to come from the advancement of the function of the fishing gear. The way to improve fishing gear should be proceeded to increase sinking speed rather than expand the size of fishing gear.