This causes them to suffocate and can't break away from the nets. The fisherman of course have no idea that the dolphin is caught up in the net until he pulls the net out of the water. Then he must hurry to try and free the dolphin so it can continue to live a safe life. Another factor is the pollution. Let's say a person is at the beach and throws a six pack coke ring in the water.
Many places have a mammal helpline people can call.
This is avaliable to help rescue the animals so they can live a free life without any dangers of dying besides it's pretators. If you want to help save dolphins think about all the things you can do in order to save them.