Also I just took this from the Mini jam 91 page describing the limitation: "The limitation is a special condition that your game must follow, but is open to interpretation. If you are unsure if your idea doesn't fit the limitation just remember that everyone will interpret it differently."
In short, it sounds like you really should include the fish mechanic. Like MissingWilliam though i'm not an official admin so this isn't an official response. Good luck!