This picture was taken at the local aquarium along with several pictures of "Nemo" as well. This photo contains the tail end of a royal blue tang, the same fish Dory is in Finding Nemo and Finding Dory.
"Almost Finding Dory,"
Forces: Vol. 2019, Article 5.
Available at: https://digitalcommons.collin.edu/forces/vol2019/iss1/5