I gather and feed 3 to 5 pounds of fresh duckweed to my 60 1-1/2 yr old Japanese Koi every other day. I have been doing this now for the past 3 months as I do every year once the weather warms up enough for it to start reproducing at a rapid rate.

They devour it like candy. Even if it were not doing them any good nutritionally or not, which I believe it is, I would do it for the shear joy of watching them devour it.

I can't see why anyone would ever want to dry it before feeding....fresh is always better...feeding live brine shrimp is far better than freeze dried or any other way and the same with duckweed.