CATDOLL : CATDOLL: What skills are needed to catch shrimp in the river?

The material used for catching shrimps is a material that can be bought in every pharmacy. It is mixed with mud and sand and thrown into the water. After a few minutes, the shrimps all float to the surface of the water and swim to the shore like soldiers receiving an order, forming a long dragon-like team and marching in one direction, completely ignoring the environment and weeds on the shore, and moving forward bravely. At this time, if a net is placed by the water to block it, all the shrimps will fall into the net. People standing on the shore can lift the net at any time and pour out a net of lively fresh shrimps.