Paedocypris is a genus of tiny fish found in the peat swamp forests of Southeast Asia, particularly in Indonesia. They are known for being one of the smallest fish species in the world, with some individuals measuring less than 7.9 millimeters in length. Their small size allows them to thrive in shallow, acidic waters where larger fish cannot survive. These fish have a unique body structure, featuring a transparent body that helps them evade predators. Paedocypris primarily feeds on small microorganisms and is an important part of the aquatic ecosystem in their habitat. Their discovery has provided valuable insights into the biodiversity of freshwater environments.