no fish?

While in the waiting room at the dentist's office Brodie was playing happily with the toys provided. After being there about 10 minutes he asks, "Why are there no fish here?" This made no sense to me so I repeated it back to him to make sure I had understood what he said. Then it came to my mind he meant fish in an aquarium. I said, "Oh, you mean like in Finding Nemo?" Brodie said, "Ya." I explained everyone decorated differently. He responded, "Oh."