Charles wrote:

Mine do something similar when the pond has been low due to
evaporation and I am refilling it. Best I can tell, they are eating,
or trying to eat, whatever has been out of the water and is now newly
available.

nah. they are feeling like its a time nature has set aside for making
little baby goldfish :P You know, snow is melting, old low water in
streams and ponds is suddenly replentished with lots of fresh...

--
Sander

+++ Out of cheese error +++