In The Stream: Frogs and insects:
You can get frogs from other side of river from village on big grassy patch near bridge. You can get insects in near the C section behind the fisherman by the rocks.
In The Stream: Ayu:
You must fish for Ayu in the competition. Go to the billboard, have your basket empty, raise your HP, and use fish eggs that you buy from the store. Go all the way downstream before you get the logs. You will see a blue person on the ledge in middle of stream. Fish there.