Tangs, also known as surgeonfish, are a highly popular species of saltwater aquarium fish. They are characterized by their laterally compressed bodies and scalpel-like spines. Most tang species are vibrantly colored and make for visually stunning additions to an aquarium. One of the most popular species of tang is the royal blue tang, which was featured in the hit Disney animation Finding Nemo. Almost all species of tang are vibrantly colored and come in bright shades of red, yellow, blue, green, purple, brown and black.