In purans there is avtar of lord vishnu.
<https://images.app.goo.gl/b2qMNkdSe2VCwegy5>

But purans are mythology and should not be taken seriously as many scholar say.

So what is the actual human evolution in **vedas**. And not from purans.

And even if you take lord vishnu incarnation it is not completely true because the first life form start around 3.5 billion years age and it was a micro organism and not a fish.