Pond Boss Forums MANAGING AN EXISTING POND Evaluating and adjusting fish populations Dead tadpoles, what does this mean?

Hello everyone, I was walking the edge of my pond yesterday and noticed a few tadpoles that looked as if they were struggling on the surface. I then went to the corner the wind was blowing in and found about a dozen large tadpoles dead on the surface, a few already had legs and were mostly transitioned to frogs.

Any idea what may have caused this? We did have a late hard freeze two nights in a row about a week ago. The coldest was 23' at my house which is about as cold as it gets all winter.