What is the smallest fish in the world?


Quick Answer

The smallest fish in the world is the Paedocypris progenetica, a tiny fish that lives in the forest swamps in Sumatra and measures a mere 0.31 inches in length. According to the National History Museum, its existence was unknown until 2006, when it was first discovered.

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What is the smallest fish in the world?
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Full Answer

This tiny fish is not only the world's smallest fish, but it is also the smallest vertebrate. It has a see-through body and at first glance looks like larvae. Its lives in water that is 100 times more acidic than rainwater with a pH of 3. The fish is a member of the carp family, and has oddly-made fins that are capable of grasping.

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