西南大西洋阿根廷滑柔鱼钓捕试验

Investigation on Fishing Technology of Illex argentinus in Southwest Atlantic Ocean

2008年1月-2009年3月西南大西洋公海滑柔鱼资源探捕调查期间,对阿根廷滑柔鱼钓捕技术进行了研究。结果表明:3种不同类型的钓钩钓捕效率有所不同,在渔况一般时,白天韩产软质钓钩的上钩率比国产钓钩高25.22%,而在夜间,国产钓钩的上钩率比韩产软质钓钩高46.26%;韩产硬质钓钩的上钩率在白天和夜间均高于国产钓钩,尤其在夜间,硬质钓钩的上钩率比国产钓钩高40.00%以上;在上钩率较高时,3种钓钩的上钩率差别不明显。6种不同颜色国产钓钩的上钩率有所不同,放钓水深较浅时,深色钓钩的上钩率均高于浅色钓钩,而放钓水深较深时,浅色钓钩的上钩率多高于深色钓钩。在鱼况一般或较差时,菱形卷扬机钓捕效率高于圆形卷扬机,而在产量较高的3-5月份渔汛期间,上钩率较高时,两种卷扬机钓捕效率相差不大。不同位置钓机的钓捕效率有所不同,其中船中位置最高。

Based on the investigation of Illex argentinus resources in the high seas of Southwest Atlantic Ocean from January 2008 to March 2009, the fishing technology was analyzed. The results showed that the fishing efficiency varied with 3 kinds of different fishhooks, of which the catch rate of colored hooks made in Korea was 25.22% higher than the hooks made in China in the daytime, whereas the hooks made in China was 46.26% higher than the colored hooks at night; The catch rate of horniness hooks made in Korea was higher than the hooks made in China in all-day, especially at night, the catch rate of horniness hooks made in Korea showed more than 40% higher; The difference of catch rate showed inconspicuous among hooks made in China, colored hooks and horniness hooks made in Korea under peak period of fishing season. The catch rate of I. atgentinus were different with varied color of hooks made in China, of which the fuscous hooks were more effective than the light-colored in shallow ocean, whereas the results showed almost opposite in deep ocean. The catch rate of I. argentinus with rhombus windlass were higher than the circular when the fishing condition was ordinary or poor, and it was pretty much the same in peak period of fishing season from March to May. The catch rate also varied with different position of fishing machines, while the mid-ship was the position of the highest catch.