A couple thoughts -
How was your last winter? Fish could have died and been consumed by the
bullheads since dead critters are part of their diet.
Could you, or someone else, overfished the pond?

Herons usually hunt in the shallows by stalking and stealth. In addition to
fish they take frogs, tadpoles, salamanders, newts and large aquatic insects
out of a pond. If they are feeding a nest full of young they will be catching
more than they, themselves, need.


kathy :-)
A HREF="http://www.onceuponapond.com/"Once upon a pond/A