Thanks for the reply -- I haven't set up my system yet, but have been wanting to for several years, and reading up on it. Project this spring/summer is to get the system running and build a greenhouse over it before the first frosts hit in Sept/Oct. I will be doing fodder, too -- I did some experiments last year, and just started it up again. Hopefully the greenhouse project will get accomplished and I'll be able to grow year-round.
I just thought of the willow idea today. I have a small stand of brush willow on my property which supplements my feed supply during the summer, and it occurred to me that it might work well in an aquaponics system. I definitely want to give it a try. (Unless someone with experience tells me it's a terrible/impractical idea!
Thanks for the feedback,