The Iridescent Shark is also known as the Pangasius Catfish. There is also an albino iridescent shark. As you may have guessed from some of the other common names, this really isn't a shark, it's a catfish. They originate from Asia and this is one of the species that is completely unsuitable for most hobbyists in our opinion. This fish can grow to be almost 4 feet in length (120 cm) and sometimes larger in the wild. They are very active swimmers as well. The Iridescent Shark is quite skittish and can be easily frightened by sudden movements in front of the tank. Their nervous behaviors can lead to damage of themselves and for their tank mates. Keeping them in a school of 5 or more may help calm them down.