Thank you for the feedback.
I would really like to know more about the bug, we did a lot of play-testing and never encountered it. Did the click simply not work or did the bowl not pop up?
There are several movement patterns for the fish (we call these movement evolutions), but I assume you mean the basic one? In short, there is an "invisible" (it purely exists in code) point for each fish, which moves in straight lines, changing direction at some fixed interval. The fish itself always moves towards that point, but will never reach it since the point moves at twice the fishes' speed.