In this game, you slap about 10 fish to death in order to survive and to avenge.
I thought Slap That Fish was boring at first, but by the fourth or fifth fight, the game started getting really fun. It turns out that just slapping is not optimal; it'll get you through the first few fights, but there are other methods that can sometimes even end a fight in one hit.
The later fights require inventive items and difficult items.
I had no shame using the walkthrough when I got stuck on the shark, because the puzzles were a little obscure, and the walkthrough will NOT give you the best score. You have to be creative to get a perfect score.
I managed to get a perfect score on the first 3 fish the second time around, but I don't know how to perfectly defeat the catfish or the tuna.