Ecklonia stolonifera (Japanese: ツルアラメ, turuarame) is a brown alga species in the genus Ecklonia found in the Sea of Japan.

It is an edible species traditionally eaten in Japan.

[1] Ecklonia stolonifera contains the phlorotannins phlorofucofuroeckol A,[2] eckol, dieckol,[3] dioxinodehydroeckol[4] (eckstolonol),[5] 2-phloroeckol, phlorofucofuroeckol B, 6,6'-bieckol,[6] triphlorethol-A,[7] phloroglucinol and 7-phloroeckol.

[8] Those phlorotannins are responsible for the potent pharmacological effects associated with this seaweed.

[6][10] The oxylipins ecklonialactones A, B,[11] C, D, E and F[12] and fucosterol[7] can also be isolated from the species.