Blue tangs (paracanthus hepatus) also known as Regal Tang is a fish featured in the Wii video games Endless Ocean and Endless Ocean 2. Dory from the video game adaption of Finding Nemo is also a blue tang. They are commonly found in coral reefs in both games.
Official description from Endless Ocean
The following is from the European version.
"A narrow fish with an oval-shaped body and a length of 25cm. It is blue with a dark, distinct striped pattern over its body and a yellow caudal fin. Can be seen all around Manaurai mostly during the summer."