top view of green fresh duckweed and dry leaves floating on water in pond. protein plant for feed fish. recirculating aquaculture

abstract aquaculture aquatic backdrop background bio color common conservation cover diversity dry duckweed ecology environment feed fish floating food fresh garden green growth lake leaf lemna lemnaceaemino lesser minor nature nitrogen nutrition organic outdoor park plant plants pond protein recirculating river small summer surface system texture top treatment tropical view wallpaper water weed wetland