NOVELTY - Growth stimulant of water phytoplankton in aquaculture comprises monoammonium phosphate, ammonium chloride, potassium chloride, sodium silicate, boric acid, sodium humate, gibberellin, compound sodium nitrophenolate, soy sauce and Bacillus powder. The growth stimulant is prepared by: weighing the gibberellin, compound sodium nitrophenolate and Bacillus, mixing at normal temperature and packaging into a bag; and weighing e.g. monoammonium phosphate, mixing uniformly at normal temperature and packaging into a bag; filling the two bags in a big bag and sealing.    USE - Used as a growth stimulant of water phytoplankton in aquaculture.    ADVANTAGE - The growth stimulant: is not influenced by environmental conditions with limited usage; has a stable effect when used in small quantities; rapidly promotes the development of phytoplankton in aquaculture, preferably the growth and reproduction of diatoms; creates good color; effectively increases the content of dissolving oxygen in the water; stabilize the pH; maintain ecological balance of water; improves the survival condition of the cultured organisms and provides rich and natural basis food for the growth of organisms; is environment friendly; and does not harm humans and aquatic animals.    DETAILED DESCRIPTION - Growth stimulant of water phytoplankton in aquaculture comprises (in parts by weight): monoammonium phosphate (10-18), ammonium chloride (18-25), potassium chloride (2-5), sodium silicate (2-5), boric acid (0.1-0.5), sodium humate (22-28), gibberellin (0.01-0.02), compound sodium nitrophenolate (0.1-0.5), soy sauce (27-42) and Bacillus powder (3-8). The growth stimulant is prepared by: weighing the gibberellin, compound sodium nitrophenolate and Bacillus, mixing uniformly at normal temperature and packaging into a bag; and weighing monoammonium phosphate, ammonium chloride, potassium chloride, sodium silicate, boric acid, sodium humate and soy sauce, mixing uniformly at normal temperature and packaging into a bag; filling the two bags in a big bag and sealing.