Mucor irregularis QEN-189 was isolated from the inner tissue of the stems of the mangrove plant Rhizophora stylosa collected in Hainan Island, China. The fungus was grown in a modified Czapek medium (dextrose 10 g, mannitol 20 g, maltose 20 g, yeast extract 3 g, corn syrup 1 g, monosodium glutamate 10 g, tryptophan 0.5 g, K₂HPO₄ 0.5 g, MgSO₄.7H₂O 0.3 g, and 1000 mL of natural seawater that was obtained from Huiquan Bay near the campus of IOCAS, pH 7.2-7.8, adjusted with 10% NaOH or 36.5% HCl, 300 mL/flask, 100 flasks, 30 L total) at room temperature under static conditions for 30 days.