According to the FAO, there are currently (2004) four million commercial fishing vessels. About 1. 3 million of these are decked vessels with enclosed areas. Nearly all of these decked vessels are mechanised, and 40,000 of them are over 100 tons. At the other extreme, two-thirds (1. 8 million) of the undecked boats are traditional craft of various types, powered only by sail and oars. These boats are used by artisan fishers.