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Dynamite fishing or blast fishing is the use of bombs to kill or hurt lots of fish at once. This makes the fish easier to catch. It is bad because it can kill lots of fish and damage where they live. It can also hurt the people fishing. It is illegal in a lot of places.
The bombs make the fish's gas bladder explode and stun them. Some of them float at the surface of the water, but a lot sink to the bottom.