Today is my first day in my City Folk town and I noticed the stall was set up. As soon as I finished my jobs for Nook, the guy appeared and told me it was a Horse Mackeral tournament. So I picked up some shells to make 500b so I could buy a rod and then got fishing. I had about an hour left, so just fished up a couple then handed them over.
I only got 15.9 inches but it was enough to win, so hooray! When do I get my prize?