拖网的网具结构分为二片式、四片式、六片式、八片式等。而四、六、八片等超过二片式的拖网,又称为多片式拖网。 多片式拖网有明显的特点,一是网具的垂直和水平扩张效能高,二是网型圆满顺滑,三是采用大网目,经济效益高。它是拖网结构的新的改革,目前已在北方、南方海区及国外渔业生产中得到广泛运用。多片式拖网也有难点。一是网具设计上、技术难度较大,二是在工艺上,加工工序多。 Trawl net structure is divided into two slices, four slices, six slices, eight slices and so on. The four, six, eight and more than two types of trawling, also known as multi-slice trawling. Multi-slice trawl has obvious characteristics, first, the vertical and horizontal expansion of the mesh with high efficiency, and second, the net is smooth, the third is the use of large mesh, high economic efficiency. It is a new reform of the trawl structure and is now widely used in fishery production in the North, the South China Sea and abroad. Multi-slice trawling is also difficult. First, the design of the net, the technical difficulty is greater, the second is in technology, processing and more.