In harvest moon animal parade how do you catch the nautilus

To catch the Nautilus, go to the Watery Cave, floor 0 in the right corner between the Blue Bell and the staircase. Find the right spot to throw your fishing rod. Just need a level one fishing rod in order to get enough length to land in the right spot. You will know if your bobber is in the right spot if you start catching eels. You can only catch it in Spring, Summer, and Fall between 3:00pm and 3:00am.