Originally posted by AC2K:

I found Tetra fish also but NOT in the lake. I found two "puddles" in different caves, one was empty and the other had nine tetra jumping all around. I didn't catch a single fish with the pole, they all just jumped out of the water and got picked up. The puddle was a small alcove about 5'x5' square and about knee deep.

Yup, that's the new "feature" in the public test I guess. I guess this is the Dev's answer to liquid lake scarcity.