Obtain an Enormous Cattail Grouper Tooth.
Haohan Mudclaw is the big boss of the Tillers union and the richest guy in the Valley! He's been nice to let me stay here, so I want to do something nice for him.
He likes expensive stuff, like ruby shards, but I don't have a lot of money, so I need to get him something else.
I know! I've seen a great big fish in Cattail Lake! We should get one of its teeth as a gift!