The tiniest ever fish has been discovered in the peat swamps of Indonesia. This belongs to the carp species, and has a transparent body and an exposed brain. A mature female fish measures only 7.9 millimeters.
This has been confirmed by researchers belonging to countries like the UK, Indonesia, Germany, Switzerland and Singapore, and the Royal Society in London has published a report on this. This is also the world's tiniest creature with a backbone, making it the smallest vertebrate in the world.