If you want to keep live fish bought for consumption for a few more days without letting them die, you can use the following methods:
1. Pry open the mouth of the live fish, pour in a few drops of liquor, then place it in a cool, dark location and cover it with something breathable. This way, even in the summer, the fish can stay alive for several days.
2. Stick two small, wet pieces of thin paper on the fish's eyes. This can allow the live fish to survive for 3-4 hours out of the water. After returning it to the water, it will soon be lively and jumping again.