Well my koi do not touch it........so not ALL koi eat it and my
goldfish rarely touch it..........so.......now what?
My circular pond, about 100 feet diameter, is covered with duckweed. I
wish something WOULD eat it.

My koi and GF both eat ALL the small, bright green type of duckweed, but do
not touch the larger, darker, thicker type - I have to keep it in my lotus
barrel on my deck and scoop some out for the pond, otherwise the fish eat it
until it's all gone - the baby pond fish in the barrels for mosquito
abatement are too small to eat it like the fish in the pond
JME - Gale :~)