Bob Dewolf

How about sealing a pond by moose or elk ?    Gotta see this!

Wayne, thanks for that.  I finally found Damit ( one M )  on amazon.  Here is more info on their pond dam sealer .  It looks promising!

Wayne,  I couldn't find a website for Dammit.  Is it simmilar to this Watersaver pond seal  ?

With a hole that tiny I have to wonder if just a wide thick blanket of clay would suffice.  It is all in how long you need it to last.  if the last hole took decades to form, you might try more of a spot fix.  You might also check with the NRCS for pond assistance

Gigi,  your situation sounds very applicable for a windmill aerator  ..  Once it is installed, it just works, as long as you have a breeze