system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why doesn't lightning striking lakes/ocean fry all the fish, yet swimming during a lightning storm is a terrible idea?
gpt
When lightning hits the ocean, the discharge spreads over the surface of the water.  Any fish/human near the surface will be electrocuted. 

Edit: humans are also better conductors than fish so the damage will be more substantial.