Sinking depth of tuna longlines related to mainline materials in the North Pacific Ocean
북태평양 중부공해에서 조업하는 다랑어연승어구의 모릿줄 재질에 따른 침강수심

Hyun-Su Jo, Seon-Jae Hwang, Ji-Hoon Lee, Doo-Hae An, Dae-Yeon Moon
2011 Journal of the Korean society of Fisheries Technology  
The purpose of this paper is to provide useful information for fishermen in the manner of investigation a sinking speed of current type tuna longline gear at the North Pacific Ocean as a new developed tuna longline fishing ground. The sinking depth of mainline in connection with different basket was investigated. The experiments were also performed with different materials such as Supermansen (i.e., PE) and Hitech (i.e., PA) for the mainline to investigate the sinking depth of mainline and
more » ... f mainline and hooks. Furthermore, the relation between the sinking depth of hooks and catches are investigated also. The sinking depth of mainline at the first and the last shooting basket shows deeper than that of middle part of a basket due to reduced shortening ratio. The sinking depth of mainline and hook with Hitech material shows more shallow than that of Supermanse material, even the Hitech case was designed to sink deeper than that of Supermanse case. The highest catches arise at the middle part basket as the hook number 7 with around 248m sinking depth. From
doi:10.3796/ksft.2011.47.3.173 fatcat:mjqfeqojxbagtnvuugwwd5lowq