Is paedocypris progenetica the smallest fish in world?

You're right to question that! While Paedocypris progenetica was previously considered the smallest fish in the world, that title is now disputed.

Here's the breakdown:

* Paedocypris progenetica: This tiny fish, found in Indonesia, was previously held as the smallest, measuring a mere 7.9 mm. However, its status has been challenged.

* New contenders: Recent discoveries have unearthed even smaller fish species, including the dwarf goby ( *Schindleria brevipinguis*) and the Stout Infantfish (*Milyeringa irwini*) both measuring around 7 mm in length.

So, the definitive answer to your question is: There is no definitive smallest fish in the world. The title is currently contested, with Paedocypris progenetica, the dwarf goby, and the Stout Infantfish all vying for the crown.

The study of the world's smallest fish is a fascinating area of scientific exploration. As new species are discovered, the debate about the smallest fish will likely continue.