POTENTIAL OF DUCKWEED (Wolffia arrhiza) AN INVASIVE AQUATIC PLANT AS FISH FEED IN TILAPIA (Oreochromis niloticus) FRY REARING M.H.S. Ariyaratne DOI: https://doi.org/10.28941/pjwsr.v16i3.325 PDF Published 2010-09-01 Issue Year 2010, Volume 16 , Issue 3 Section Articles