Fishing nets used at sea require special materials, and their volume, weight, and cost far exceed those in freshwater waters; The fishing net referred to here is a narrow, silky net commonly used in freshwater waters.

    In fact, even if the scope is narrowed down to such a narrow sense, many types of fishing nets can still be distinguished depending on factors such as material, wire thickness, mesh size, float, sinker, length, height, number of layers, and target catch. Fortunately, their structures have commonalities. Here, the most typical single-layer and three-layer networks are used as examples for explanation.

    Mesh: Refers to a mesh fabric made of silk thread material with certain specifications (mainly including the thickness of the thread, the size of the mesh, the number and liveliness of the mesh knots, the number of mesh edges, etc.). My dialect calls it "Wangyizi". Nowadays, the mesh is woven by machines, with materials such as polyethylene and nylon. Long ago, there were many elderly people in rural areas who made mesh by hand. I still have tools in my hometown.

Mesh size: As the name suggests, it is a concept. The mesh is a congruent diamond shape. Under normal circumstances, the side length of the mesh can be measured in centimeters (i.e. centimeters and centimeters) to represent the mesh size. However, to the best of my knowledge, not all of the people use the International System of Units to represent mesh size, but rather the more popular way of saying 'X refers to X points'. Common specification classification diagrams for Taobao shops and fishing net shops

    This is a very rough statement. Specifically, in the fishing net market, 10 points equals 1 finger, and the meaning of 1 finger is verbal, and the width of an adult's index finger is. My father said that it can be roughly assumed that one finger is equal to 2cm. Familiar fishermen can understand the specifications of the mesh when ordering nets between fishing net merchants by simply pointing a few fingers. It should be noted that the side length of the diamond shaped mesh is half of the three finger, four finger, and five finger mentioned here. That is to say, the mesh size described by this method is the length of the mesh when the diamond is transformed into a line segment.

    Cable thickness: It is also a concept as the name suggests. This only explains the mesh made of silk thread material. Due to the extremely fine silk thread, the thickness is usually specified during machine manufacturing, and then the finished product is checked for thickness using a vernier caliper and micrometer. If the diameter is 0.125cm, it is called 125 lines; 0.128cm is called 128 lines, which is pushed inward.

    Mesh area: The mesh can be deformed at will, so how do you calculate the area of the mesh? The reason for calculating the mesh area is to determine the pricing of the mesh. Obviously, after the specifications such as mesh size and wire thickness are determined, the larger the mesh area, the more materials required, and the higher the price. How can we calculate the mesh area so that everyone can accept it? The routine in the industry is to count the length and width of the mesh, and then calculate the value of square ten thousand mesh. Afterwards, everyone can price the mesh with square ten thousand mesh.

    Mesh: Mesh is soft and shaped according to nature, and to maintain a certain area shape in water, it is necessary to have mesh to maintain it. So the outline is the line that passes through the upper and lower edges of the mesh fabric. This type of wire is generally thicker, has higher strength and toughness, and is often made of multiple strands twisted together.

    It can be seen that the white thick line here is clearly composed of multiple thin strands twisted together. So here comes a concept: the number of shares in a line. The number of strands in a thread is the number of indivisible plastic glue threads that can be divided into. Generally speaking, the specifications of single strand wires in factories are the same, and the measurement standard is that the weight of a 1000 meter single strand wire is a fixed value (I forgot what this value is)

    Float: In the materials of mesh, polyethylene or nylon materials cannot directly float. Therefore, in order to maintain a relatively stable position of the mesh in water and not be carried away by underwater currents, a float is needed to provide buoyancy for the mesh. The common material of float is foam board. Some large fishing nets will use customized foam float balls or hollow plastic floats. The material of foam board is similar to the foam filled in the life jacket, but when the section is enlarged, there are many small holes, which will provide stronger buoyancy.

    Generally, the foam boards bought from the fishing gear market are whole pieces, which need to be cut into small cuboids of different sizes with a knife (the following figure is a schematic diagram, the material is plastic, not shredded foam floats). Then, the two ends of the fishing net were tied tightly with wire, passing through the edge of the net to form the head of the fishing net.

    Pendant: In order to maintain the unfolded state of the mesh in the water, after the head is floated, the bottom needs to be tightened with a heavy object to form tension. This is the function of a pendant. Pendant is generally made of metal tin, copper, lead, etc. Iron pendants are also available, but they are easy to embroider and are usually galvanized.