9. Paedocypris
World’s smallest fish: The species of fish belongs to the carp family and is called Paedocypris progenetica . It is the world’s smallest vertebrate or backboned animal. The tiny, see-through Paedocypris fish have the appearance of larvae and have a reduced head skeleton, which leaves the brain unprotected by bone. They live in dark tea-coloured waters with an acidity of pH3, which is at least 100 times more acidic than rainwater.
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