Red algae appear red in color due to the presence of the following pigment

Red algae are red in color due to the abundance of a phycobilin known as phycoerythrin. Phycocyanin is a blue colored phycobilin. Fucoxanthin is present in brown algae and responsible for brown color of brown algae. Carotene is a red or orange colored pigment associated with chromoplasts and chloroplasts