Found this article in the excellent Numlock News newsletter, which had the following précis:

Duckweed is an aquatic plant that's seen as a promising source of protein for humans and animals alike. Duckweed grows in freshwater, and under optimal conditions is 45 percent protein, with a hectare of duckweed producing 10 to 18 tonnes of protein per year. By comparison, the same area of soybeans would produce 0.6 to 1.2 tonnes of protein. Duckweed grows fast — the quantity can double in less than 48 hours — and now the challenge is finding out ways to extract rubisco, the main enzyme present in the leaves and the single most abundant protein on Earth.

https://www.numlock.com/p/numlock-news-july-19-2024-viper-gu...