How big is the biggest fish?

The world's biggest fish is the whale shark. This harmless filter-feeder has long been known to reach 15 meters and more. Now scientists using laser-aided cameras report some are bigger - nearly 20m.
Note: Michael Bright, in his book There are Giants in the Seas, cited reports of whale sharks up to 75 feet (over 22m!). That would be surprising - and awesome - but it's not impossible.