The paper summarizes current knowledge, gained from practicial experience from the beginning of 1989 to mid-1991 in an experimental program in Mirzapur, Bangladesh, where duckweed cultivation was established and fresh duckweed fed to carp and tilapia. In the Mirzapur experimental program, a farming system was developed, which can sustain dry weight yields of 20-35 metric tons per hectare per year, which is a rate exceeding single-crop soybean production six to tenfold. Section 2 discusses duckweed farming issues in detail.