This is fascinating. Perhaps the plant protein as meat substitute is getting too much focus? Maybe that's just the part that is seen as potentially the most profitable. I wonder if that's shortsighted compared to using the whole plant as a potential food source.

I was familiar with duckweed's use in aquaculture systems, but not with the fact that duckweed is actively consumed and quite edible: Nutritional value of duckweeds (Lemnaceae) as human food

The application of selective pressure to work on making domesticated forms is cool. The rapid generational cycle of just a couple days has got to make that nicer to work with. We have better abilities today than in past centuries to leverage artificial aquaculture. Though again, I think I that we should not overlook consuming the whole plant, it's definitely interesting considering how it could be fractionated into different components. If processed to extract specific protein content, I could imagine that the rest of the slurry byproduct could still have uses in human nutrition, fish feed, fertilizers, and more. Growing duckweed also captures carbon from the air.