The captain of the boat charges for the boat tour only. He lends passengers a reel and puts a piece of bread as bait. You never touch the bread, and any fish caught will eat the bread, anyway. At the end of the trip, you return the reel to the captain.
During the period that you are fishing with the borrowed reel, are you possessing any chametz since the bait is at the end of the reel? Or since the reel and bait doesn't belong to you - it's on loan, and the bait is used to catch fish and will be (most likely) gone in a minute anyway, is this activity permitted?