Chunks of metal(boats) floating on salt water. Surely nothing can go wrong.
It would possibly fry their electronic equipment, but generally speaking, metal isn't harmed by electricity. (We use metal to conduct electricity all the time without incident, after all..)
Things are only damaged by electricity when they are poor conductors of electricity, because lost electricity is turned into heat, if electricity needs to make long arcs to complete a path to ground (in which case the air is being a poor conductor, but nearby things are also scorched), or if, like animals, they use electric impulses to control their bodies.
Also, you can touch something conducting electricity without incident if you aren't a good path to ground. I remember a case where a person was in a truck that a power line fell on. Sitting in the truck was fine, trying to step out of the truck while still touching the truck would kill because that meant their leg was a path to ground, and electricity would flow through their body, but jumping off the truck saved them because getting enough distance cleared the path to ground.
Saury?
With this high-voltage current generation equipment I developed,That's our Akashi-san for you!Gyaaaaa!?Let's waste no time in showing you what it can do!Ahhhhhh!?I'll get a great haul in one shot!
