Tie tightly by the riverbank, then cast into the river. Once the fish trap is submerged in water, fish and shrimp, mistaking it for a prime nesting spot, eagerly swim inside. You can sprinkle some fish and shrimp delicacies into the trap, enticing them to desperately enter! The sides of the fish net have entrances, cleverly designed with larger entrances leading to smaller ones inside, ensuring once they're in, there's no way out. After a period of time, retract the net and pour out your catch.