北太平洋中部渔场鱿鱼钓渔具渔法的初步研究

利用舟渔1301鱿鱼钓船,于2000年5月15日～7月8日对北太平洋中部渔场(39°～42°N,180°～171°W)鱿鱼钓渔具渔法进行了初步研究,结果表明:(1)当鱿钓船日产量在4t以下时,手钓产量比例较高;当日产量在4t以上时,机钓就体现了一定的效能。(2)大号钓钩脱钩率最低,小号钓钩脱钩率最高。(3)不同颜色的钓钩脱钩率相差不大,而上钩率则有较大差别,黄色上钩率最佳(20.57%),其余依次为红色(19.43%)、绿色(18.0%)、黄绿色(14.86%)、青色(12.0%)、浅蓝(10.0%)、橙色(5.14%)。(4)设置抖动后,上钩率高于非抖动状态,而脱钩率上升,但总体钓获数还是抖动高于非抖动状态。(5)手线规格大小和新旧,对上钩率影响不大;但钩线的规格大小和新旧对渔获率有较大的影响,从经济效益来分析:一般每隔3～4/d更换钩线一次,并且钩线的材料以PA,直径为0.91mm较好。

The Preliminarly Research of Fishing Gear and Method at the Middle Fishing Ground in North Pacific Ocean

From May 15th to July 8th in 2000,I researched initially the squid fishing gear and method at the middle fishing ground in North Pacific Ocean by the fishing vessel-Zhou Yu 1301.The result indicates that:(1) When day yield of squid jigging vessel is below 4 tons,the yield of jigging by hand is higher,and when above 4 tons,the yield of jigging by machine is higher.(2) The jigging-off rate of large fishing jigging is the lowest,and the jigging-off rate of the small fishing jigging is the highest.(3) The jigging-off rates of the fishing jigging different colors are not very different,but the jigging rates of them are very different.The using with yellow jigging will achieve the best result(20.57%),and the results of jigging with other colors are as follows: red(19.43%),green(18.0%),yellow-green(14.86%),light green(12.0%),light blue(10.0%) and orange(5.14%).(4) After setting the trembling,the jigging rate is higher than that of non-trembling,but the jigging-off rate rises,nevertheless the total amount of snaring of trembling is higher than that of non-trembling.(5) the hook line's specification and age have little effect on the jigging rate,but it have large effect on the fishing rate.Form the aspect of economic benefit,usually the jigging line should be replaced every 3 to 4 days,and the better material of the jigging line is PA and the better diameter is 0.91 millimetres.