Go to the pond as adult Link. Put the Hover Boots on, and pay the guy to fish. Once you have the rod, run onto the pond, and cast while hovering. You can now walk around with the rod cast! While you can do this, let a fish bite the rod. When it has, hold in "A" so as not to loose the fish. Run over to the pond owner, and tell him you want to quit. You'll loose the rod, yet the fish will be stuck in the place it was in before you chose to quit. Now, simply run over to the fish, and the little scene which plays when you catch a fish will play. And there you have it! You can use this to catch the biggest, hardest to reel in fish in the pond with great ease.