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2. Puffer Fish:
These are the second deadliest of all fishes known. their habitats are the tropical and semitropical oceans. The other name is Tetraodontidae and closely look like the porcupinefish. When they sense danger, they puff and take the round shape. This makes their venomous spikes point out. The venom from the puffer fish can kill an adult human in a few minutes.