You know the wall between the switch and the door? Well, the switch is so close that you
can simply attack the fish through the wall and it will fall on the switch.
This only works on 1 of the 6 rooms where you have to do that, so it might not work on the
one your stuck on.
In a different room with fish bones, the trick is to hit it WAY above the switch so that
when you get there, the door's open. That works on two of the rooms.
For the remaining three rooms just use turbo swim and Ultra star spin. Also use currents
to your advantage.