Ko e ʻakau ʻi he saienisi ʻo e moʻui ko e taha pē ʻo e puleʻanga tuʻi ʻo e ngaahi meʻamoʻui ʻe 4 ʻoku fakatefito ki he ngaahi lokiʻimoʻui ʻoku lahi. Ko e ngaahi holisi ʻo honau lokiʻimoʻui ʻoku fefeka pē mo e meʻa ngeʻesi ʻi loto. ʻOku faingataʻa ʻo fakamatala totonu ʻa e ʻuhinga ʻo e ngaahi ʻakau. Kā ko e lahi taha ʻo e ngaahi ʻakau ʻoku lanumata he chlorophyll, ko e meʻa kemi ʻoku lava puke ʻa e ivi ʻo e maama ʻo e laʻā. ʻA ia ko e ʻakau ko e tumuʻaki ʻo e haʻi sēini meʻatokoni ʻi māmani.