Gracilaria sp. Extract Feed for Giant Freshwater Prawn (Macrobrachium rosenbergii) Nursery is made from locally sourced fish meal, Azolla, fine rice bran, vegetable oil, tuna oil, Lecithin oil, Gracilaria sp. extract and a binder. Carefully mixed, pelletized and oven-dried, it is a sustainable, nutrient-rich feed that boosts growth, health, and survival of prawn larvae.