Althought I think Bioponics is a fine idea, the name is a bit gimmicky. What it really is, is hydroponics using home made organic nutrients. They're fish safe, so fish can be added to enhance N. In a properly run aquaponics system, the food for the fish is supposed to have all the necessary nutrients for the plants (once processed by the fish and bacteria making them biologically available naturally).
The bit where duckweed is added is redundant. The duckweed takes up N, which is provided by the fish in the first place. This is an aquaponics cycle within the bioponics system. It doesn't add anything, unless you just like the look of duckweed.
Other than the duckweed bit, I wouldn't mind experimenting with this in the future, perhaps with well filtered worm tea in an areoponics system.
Thanks for the post.