Several students are chosen to be taggers (and wear goggles), 2 more are chosen to be Dorie (and carry the blue fish), and Merlin (and carry the orange fish). The rest of the students are Nemo's. The Nemos begin on one of the mats (reef). On the start signal they leave the mat and run (swim) into the gym (ocean). When a student is tagged they go to the fish tank and complete the activities listen until Dorie or Merlin come to rescue them.