The biggest shark is the whale shark, which can be up to 50 feet (15 m) long. It is a filter feeder and sieves enormous amounts of plankton to eat through its gills as it swims. It is also the biggest fish.
More amazing pictures can be found here.
http://www.dailymail.co.uk/news/article-2182996/Breathtaking-images-beauty-giant-whale-sharks.html