Originally Posted by BDBeaux
* Tadpoles are developing

BDBeaux, if by this you mean they are transforming into frogs ... then lungs are developing and the activity may be frog-poles or toad-poles taking breaths of air at the surface. Probably most of the activity is from the tadpoles especially if you view this level of activity whenever go down to observe.

Did the neighbor say what kind of predator fish are in the upstream pond?

It isn't what we don't know that gives us trouble, it's what we know that ain't so - Will Rogers