I remember sometime back someone had fish dying and he couldn't figure out why.
Turned out he'd sprayed wasp/hornet spray and the residue was running off into
his pond. If I remember correctly, 1 part per million would kill fish. Any
chance there's been any spray used around your pond that could have found it's
way into the water.

Karen
Zone 5
Ashland, OH
http://hometown.aol.com/kmam1/MyPond/MyPond.html
My Art Studio at
http://members.aol.com/kmmstudios/K....M.Studios.html
for email remove the extra extention