How big can a 4 meter high cast net be?

Theoretically, a 4-meter-high net casts a circle, which is a circle with a radius of 4 meters. The area can cover a maximum of 50.24 square meters of water surface. In fact, due to factors such as the mesh size of the net and the level of net-casting technology, it is difficult to

achieve this result.

Classification: Fishing nets are functionally divided into gill nets, drag nets (trawl nets), seine nets, built nets and laid nets.

It requires high transparency (some nylon mesh) and strength, good impact resistance, abrasion resistance, mesh size stability and softness, and appropriate elongation at break (22% to 25%).

It is processed by monofilament, multifilament twisted yarn (knotted mesh) or monofilament warp knitting (raschel, knotless mesh), primary heat treatment (fixed knots), dyeing and secondary heat treatment (fixed mesh size).

Extended information: Specific classification of fishing nets: bottom net with eight buckles fixed on the bottom, mesh 100x100 mm, upper and lower eight buckles, mainly used to catch bottom fish such as flatmouth and puffer fish, so it is called bottom eight buckle. The net setting procedure is the same as that of wire mesh

, only measured by the bottom of the sea.

The nets are lowered in the evening and closed in the morning.

It is also commonly used by farmers and fishermen.

The mullet net is a relatively primitive fixed-position seine net.

It consists of a lookout tower and a circle net.

The lookout is built on a wooden frame on a reef in the sea, about two feet high, with handrails on all sides for safety.

The hoop net is made of a round net with stakes, leaving a door. The edge of the mouth is connected to the other end of the net and the upper and lower ropes. The ropes lead to the observation deck. A person is placed on the observation deck to look out and find fish schools.

After entering the net circle, pull the steel cable, close the door and retract the upper and lower links to close the net in a spherical shape.

Then shake the signal to call others to join the peer network.

This net is mostly used in the autumn flood season when mullet come ashore for bait.

Because the network utilization rate is too low.

It was abandoned in the late 1940s.

The stretch net, commonly known as the ecstasy, is the main net gear used by farmers and fishermen to catch herring (that is, West Pacific herring). It consists of three parts.

That is, it consists of a net wall, mesh (30x30 mm, 3 meters high), and net clothing (about 10 meters long).

There are upper and lower gangways. The upper gangway is equipped with glass or polyvinyl chloride floats, and the lower gangway is tied with steatite pendants and anchored to make the net hang vertically in the sea.

When placing the net, one end of the net is fixed along one quarter of the net wall, and then the net is laid out in a circular shape with the inserted part of the net wall as the axis.

The other end of the net is not closed to the net wall, leaving a doorway of about ten feet for fish to swim in.

There are 6-8 net sleeves placed on the wall of the net hoop, which is the bottom net.

After the fish swam into the net pen, there were nets on all sides, but the gaps in the net sleeves were large, so they swam into the bottom net, which could only enter but not exit.

When moving the net, drive the sampan to move along the net circle, lift the tail of the bottom net, and untie the rope to release the captured objects.

The hanging net is one of the commonly used fixed nets for fishermen, and it is also a relatively ancient net.

The entire network is divided into two parts: the mesh body and the mesh bag.

The net body is composed of several mesh pieces connected into a large piece, and then folded and sewn into a truncated conical net body.

The mesh size decreases from front to back. Therefore, the net body is thicker at the front and thinner at the back. The mesh mouth is made of four bamboo poles tied into a rectangular shape, about 1.5 x 2.5 meters. In the middle of the rectangle, there is a bamboo pole connecting the two bamboo poles above and below the mesh mouth. It is called

It's called a "gun".

The "gun" is connected to a rope and tied to the prong on the seabed.

In the long current, the "gun" and the net gate are opened and stand upright in the sea; in the advection current, the "gun" and the net mouth lie flat on the sea.

The mesh bag is made of a piece of dense mesh, about 4 meters long, and connected to the net body.

A circular object made of broom strips - commonly known as shrimp whiskers - is connected to separate the fish and shrimps so that fish and shrimp can enter but not exit.

The specifications of the Tanzi network are 13.9x 5.3 meters.

The entire network consists of two parts: the mesh body and the mesh bag.

Like the hanging net, the net body is made up of several mesh pieces folded together to form a conical shape. The net bag is sewn together from a piece of net, and a shrimp whisker is also placed at the joint.

The ropes are divided into net mouth ropes, net ear ropes, net bottom ropes, fork ropes, root ropes, etc. Each piece of net uses two large jars as buoyancy and two bamboo poles as support poles.

There are ropes on both sides of the lower end of the net port connected to wooden pegs. The operation method is the same as hanging the net. Every year during the Qingming Festival, the net is tied at different heights.

The net needs to be tied to both sides of the sea current, and the sea current is used to open the mouth of the net. The height of the net is determined based on the catch volume of the high and low net rows - that is, the distance from the shore. The net will be officially tied after Grain Rain.

Both hanging nets and jar nets need to be tied with pegs.

The prong is made of wood, with a lower tip and a thicker top, 40 to 50 cm long, and a protruding wooden stick with a diameter of 15 cm at the top for tying the root rope.

When plowing, use two sampans to carry out the operation continuously during the advection of small floods.

First, the prong pole is erected, and the end iron sleeve covers the protruding wooden stick at the top of the wooden prong. Then, with the prong boss holding the pole, 12 fishermen hold the prong pole together, and slam into the seabed, driving the prong into the sediment on the seabed.

It must be driven in once. If it is not driven in or is knocked crookedly, the rope will be cut and the prong will be discarded.