Why aren't fish electrocuted when lightning hits the ocean?
Remember when you were a kid, and everytime there was a thunderstorm, the Lifeguards told you to get out of the pool? Well, fish are always in the water, so why aren't they electrocuted when lightning hits?
Basically, it's because electricity always takes the path of least resistance, i.e. travels through the most highly conductive substance at every point between its origin and the ground. When you're in the pool, that's you, but only because your head is almost always out of the water. You are a better conductor than the air surrounding you (also why you need to get off the high ground during a t-storm), So the electricity will travel through your body until it reaches the water, at which point it will go to the water and continue to ground. If you could stay completely underwater for the duration of the storm you'd be quite safe. The same thing applies to fish. Their bodies conduct electricity poorly compared to the saltwater surrounding them, and so the electricity travels harmlessly through the water, bypassing the fish and any other living creature.