Blast fishing is when people use bombs or explosives to catch fish. This is really bad because it can hurt the fish, the ocean, and other animals that live in the ocean.
Imagine you're in a big swimming pool with lots of your fish friends. Someone throws a bomb into the pool and it explodes. The water moves really fast and you get scared and hurt. That's what happens to the fish in the ocean when people use bombs to catch them.
The explosion from the bomb hurts not only the fish, but also other animals in the ocean. The loud noise from the explosion is like a loud hammer hitting your ears, but imagine being a dolphin or a turtle and not being able to go anywhere to get away from the sound.
Also, when the bombs explode, they can damage the coral reefs, which are really important homes for fish and many other ocean creatures. This means that the animals have nowhere to hide, and they can get hurt even more.
So, blast fishing is a really bad thing to do. It hurts the environment and the animals. It's important that we protect the ocean and the animals that live in it, so that they can continue to live happy and healthy lives!