疏目拖网是世界拖网捕鱼的发展趋势。疏目拖网通过大幅度放大网目尺寸,可以减小拖网阻力,加大网具尺度,放大网口周径,增加扫海面积,扩大对鱼群的立体包围圈,提高捕捞效果。上海海洋渔业公司从1977年起开展疏目大网的设计,并在试验和生产中获得成功。据1978年统计,40厘米网目的疏目大网平均增产11.3％,使 Dredging trawling is the trend of trawling in the world. Dredging Trawling By greatly enlarging mesh size, trawl resistance can be reduced, mesh size can be enlarged, mesh diameter can be enlarged, sea sweeping area can be increased, stereo enclosing ring can be enlarged and fishing effect can be improved. Shanghai Maritime Fishery Co., Ltd. started its design of sparse mesh network in 1977 and succeeded in testing and production. According to the statistics of 1978, an average net increase of 11.3% in the 40-centimeter net-sparse net resulted in an increase of 11.3%