印度洋西北海域鸢乌贼钓捕技术试验

Fishing technology of Symplectoteuthis oualaniensis in the Northwestern Indian Ocean

2004年9月～2005年1月印度洋西北海域鸢乌贼调查期间,对钓捕技术进行了试验.结果认为,不同的作业位置其手钓产量不同,其中船头产量为最高,手钓平均脱钩率不到10%.采用变色灯是提高渔获量的重要技术,时间一般为凌晨3:00～5:00,其钓捕产量可占总产量的一半以上.变色前后的单位时间产量分别为0.565 t/h和1.044 t/h.采用1.6 mm×3排机钓钩、每根钓线装6～8枚机钓钩进行单线作业,可有效降低脱钩率,平均脱钩率只有12%.

During the investigation of Symplectoteuthis oualaniensis in the Northwestern Indian Ocean from September 2004 to January 2005, the experiments on fishing technology were made. The results showed that the catch of jiggers varied with different fishing positions, of which the stem was the highest catch. The average dropping rate was less than 10 percent. The use of incandescent lamps is the important way to improve the catch in which more than half of the total catch were taken from 3a. m. to 5a. m. , and the catch was 0. 565t/h and 1. 044t/h before and after applying the light, respectively. The method of using 1.6mm×3- row squid jigging machine with each jigging line equipped with 6 to 8 jiggers is applied to effectively reduce the dropping hook rate to only 12 percent.