You have no fish. Your movement speed is 1. On previous turns you had injured all your administrators. On your last turn you returned to your home port. And.... the three other players take the three spots surrounding your home port.
Because your administrators were injured, they were only healed by visiting your home port, not returned above deck. So you don't have an active administrator to exhaust, and thus you can't end your turn in a spot with another player. But you must move, and the only spots you could reach are occupied by other players. What happens?
Is this just an odd edge case or do I have some other rule wrong?
At the right top of your ship board are your possible movement speeds. You put a cube there to remind yourself what your current speed is. At the start of the game, you place a cube at the '2' space and it never drops below that.